Journal articles on the topic 'Gonad condition'
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1
Sulistiono, Suzana Refiani, Fadly Y. Tantu, and Muslihuddin. "Gonad Maturity of Coconut Crab (Birgus latro) in Pasoso Island, Central Sulawesi." Jurnal Akuakultur Indonesia 8, no. 2 (July 1, 2009): 175. http://dx.doi.org/10.19027/jai.8.175-184.
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<p>Study on gonad maturity of coconut crab (<em>Birgus latro</em>) was carried out from June 2004 to January 2005. Crabs were collected by some gears such as trap, net and by hand. Observation was done to know sex ratio, gonad maturity and eggs diameter, while analysis was employed to estimate condition factor, gonado somatic index and fecundity. Observation result showed that condition factor, gonad maturity and gonado somatic index varied depending on sampling month. Gonado somatic index showed a high value around November/December. A similar result was also showed by condition factor and gonado somatic index that was high around November /December. Fecundity varied from 58.717 to 197.400. Oocyte diameter varied from 0,015 to 0,035 mm, had one mode that is clasified to be a total spawner.</p> <p>Keywords : Gonad maturity, coconut crab (<em>Birgus latro</em>), total spawner.</p> <p> </p> <p>ABSTRAK</p> <p>Penelitian tentang kematangan gonad kepiting kelapa (<em>Birgus latro</em>) dilakukan sejak Juni 2004 sampai Februari 2005. Sampel kepiting ditangkap dengan menggunakan beberapa peralatan, yaitu perangkap, jaring dan secara langsung dengan tangan. Pengamatan dilakukan terhadap jenis kelamin, kematangan gonad dan diameter telur, sedangkan analisis dilakukan untuk menentukan faktor kondisi, indeks kematangan gonad, dan fekunditas. Hasil pengamatan menunjukkan bahwa faktor kondisi, kematangan gonad dan indeks kematangan gonad bervariasi tergantung dari bulan pengambilan contoh. Pengamatan kematangan gonad menunjukkan bahwa nilai tertinggi terdapat pada November/Desember. Keadaan yang sama juga ditunjukkan dengan nilai faktor kondisi dan indeks kematangan gonad yang cukup tinggi pada bulan November /Desember. Fekunditas berkisar antara 58.717-197.400 butir telur. Diameter telur berkisar antara 0,015-0,035 mm, memiliki 1 puncak sehingga dapat diklasifikasikan sebagai total spawner.</p> <p>Kata kunci : Kematangan gonad, kepiting kelapa (<em>Birgus latro</em>), total spawner.</p>
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Varkentin, Alexander I. "Seasonal dynamics of gonads maturity and indices of body condition for walleye pollock Theragra chalcogramma in the northern part of the Okhotsk Sea." Izvestiya TINRO 180, no. 1 (March 30, 2015): 77–92. http://dx.doi.org/10.26428/1606-9919-2015-180-77-92.
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Seasonal dynamics of gonad maturity and body condition indices (liver weight, hepato-somatic index, weight-size ratio) is analyzed for walleye pollock in the northern Okhotsk Sea. Its spawning season is rather long both for the whole population and any spawning ground, e.g. at West Kamchatka the fish with melting gonads is observed from December to September and probably later, but the mass spawning continues about one month - in March-April, on average. After the spawning, a new annual biological cycle begins from the period of gonad recuperation (stages of gonad maturity VI and VI-II) that continues 2-3 months followed by the period of gonad maturation from the stage III to the next spawning. The portion of the pollock females and males with the stage III is the highest in August-September, and with the stage IV - in March, before the mass spawning. In the northern Okhotsk Sea, the dynamics of maturing is similar, with the lag of 2-3 weeks. However, the gonad maturing depends on thermal conditions: they develop faster in «warm» years than in «cold» ones. Besides, big fish begin to spawn earlier than small ones spawning in the first time. Males usually stay on the spawning grounds longer than females. Body condition of walleye pollock is influenced by the process of gonad maturation. Energy potential of its individuals forms until August-September, and begins to decrease when gonads transform from the stage III to the stage IV. Later the indices of body condition continue to decrease till spawning in March-April, and melting individuals and postspawners have the lowest values. After the spawning, the indices begin to grow again because of active feeding.
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Young, P. C., G. J. West, R. J. McLoughlin, and R. B. Martin. "Reproduction of the commercial scallop, Pecten fumatus, Reeve, 1852 in Bass Strait, Australia." Marine and Freshwater Research 50, no. 5 (1999): 417. http://dx.doi.org/10.1071/mf98149.
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To examine the reproduction of Pecten fumatus Reeve, 1852, samples were taken monthly from beds off King Island and in Banks Strait, from July 1986 to July 1987. For each sample the mean gonad-free tissue weight and standardized gonad weight were calculated. The percentage of the sample with each of five macroscopically determined reproductive stages was also measured. Changes in the proportion of cell types within the ovarian part of the gonad were determined by histological and stereological methods. A seasonal cycle of gonadal development occurred at each site, commencing at the time of lowest water temperatures and highest nutrient concentrations. This development progressively increased as the nutrient concentrations declined. No correlation was seen between chlorophyll a and gonad condition. A synchrony in gonad condition was present among individuals in samples; this was greatest at Banks Strait where gonads were larger, and phosphate, nitrate and silicate concentrations were significantly greater. There was no reduction in somatic tissue weight with increase in gonad tissue weight. Maximum gonad development preceded spatfall at each site by about one month.
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Joll, LM, and N. Caputi. "Geographic variation in the reproductive cycle of the saucer scallop, Amusium balloti, (Bernardi, 1861) (Mollusca:Pectinidae), along the Western Australian coast." Marine and Freshwater Research 46, no. 4 (1995): 779. http://dx.doi.org/10.1071/mf9950779.
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The reproductive cycle of the saucer scallop Amusium balloti was examined at three sites spanning a large part of the north-south range of the species on the western coast of Western Australia. Variations in gonad dry weight were highly cyclical, with minimum gonad weights in Shark Bay (25�S) occurring between January and March and maximum gonad weights occurring around July or August. The pattern of variation in gonad weight at the Abrolhos Islands (29�S) and Fremantle (32�S) was similarly cyclical, but the times of high and low gonad weights occurred at similar times at both sites and approximately two months later than in Shark Bay. The variations in gonad weight were associated with large variations in meat weight and condition, which would need to be considered in any yield analyses of fisheries for this species. Gonad dry weight increased rapidly following the end of the resting period, and histological examination showed that gonads contained mature gametes within one to two months of the end of the resting period. Although gonad weights continued generally to increase over a period of three to four months following the end of the resting period, variations in gonad weight during this period indicated that partial spawning may be occurring before the time of peak gonad weight. Residual gametes were observed in the ciliated ducts of scallop gonads within one to two months of the start of the rapid increase in gonad weight until the onset of the resting period, indicating that partial spawning was occurring throughout this time. Estimation of the settlement dates of recruits supported the conclusion that spawning commenced shortly after gonads began their rapid weight increase and suggested that spawning may follow a lunar cycle. Partial spawning provides multiple opportunities for larvae to develop in environments conducive to high larval survival and may be an important factor in determining recruitment success.
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Ramofafia, Christain, Maria Byrne, and Stephen Battaglene. "Reproductive biology of the intertidal sea cucumber Actinopyga mauritiana in the Solomon Islands." Journal of the Marine Biological Association of the United Kingdom 81, no. 3 (June 2001): 523–31. http://dx.doi.org/10.1017/s0025315401004179.
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Over a four year period, gonad index, examination of gonad tubules, and histology were used to study the reproduction in the sea cucumber Actinopyga mauritiana. This species reproduced annually during the warmer months of the year in Solomon Islands. This annual reproductive cycle progressed through five maturity stages: recovery, growing, mature, partly-spawned and spent. The recovery stage (March–May) was marked by initiation of gametogenesis and coincided with decreasing day length. The growing stage (June–September) was characterized by development of gametes through to the mature stage (October–December). Spawning occurred October through December and coincided with increased water temperature and day length. Spent gonads (January–March) contained a few unspawned gametes or completely lacked gametes. Although A. mauritiana had annual reproduction, individuals lacking or having indeterminate gonads were present year-round. Macroscopic examination of gonad tubules after biopsy provides a practical tool for assessing maturity condition of broodstock in the field during the reproductive season.
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Pawson, M. G., and G. D. Pickett. "The Annual Pattern of Condition and Maturity in Bass, Dicentrarchus Labrax, in Waters Around England and Wales." Journal of the Marine Biological Association of the United Kingdom 76, no. 1 (February 1996): 107–25. http://dx.doi.org/10.1017/s0025315400029040.
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Morphometric data on bass, Dicentrarchus labrax L. (Pisces: Percoidei), sampled around the coasts of England and Wales between 1982 and 1990, have been analysed to elucidate seasonal patterns of feeding, body condition and gonad maturity. The somatic condition and fat reserves of bass in the Irish Sea and southern North Sea improved more rapidly during the spring and summer than in bass further to the south. In winter, however, fat reserves were higher and there was more food in the stomachs of bass caught in the western English Channel. The onset of maturity was related to fish length. Male bass became mature for the first time at 32–36 cm total length, but though many females showed signs of gonad growth at this size, no female <42 cm was found with mature (ripe or spent) gonads. Gonad development in adult bass of both sexes began in October and, from January until June, most males >36 cm had ripe testes. The period during which ripe eggs could be expressed from the ovaries of female bass was briefer, with spawning apparently peaking in April. It is concluded that the migration of adult bass to the north in spring and southwards and westwards in autumn has both growth and reproductive benefits related to sea temperature, and that the more limited movements of bass <42 cm, which remain in relatively cold, inshore waters in winter, results in an inhibition of gonad maturity in females.
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Bernet, Daniel, Thomas Wahli, Christoph Küng, and Helmut Segner. "Zooplankton Feeding Induces Macroscopical Gonad Malformations in Whitefish (Coregonus ssp.) from Lake Thun, Switzerland." Fishes 5, no. 3 (August 20, 2020): 26. http://dx.doi.org/10.3390/fishes5030026.
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Alterations in gonad morphology are widespread in wild fish populations. Whitefish (Coregonus spp.) from Lake Thun, Switzerland, display a high prevalence of macroscopical gonad malformations including fusions to the musculature, segmented gonads and intersex condition. The aim of the present study was to evaluate whether the gonad morphological changes in Lake Thun whitefish are caused by genetic factors, environmental factors (water, diet) or “gene × environment” interaction. We performed two independent experiments of a three-year duration in which we reared whitefish from fertilization until adulthood and tested the possible causative factors using a matrix design: (i) genetics—comparing the prevalence of gonad malformations in whitefish of different genetic origin reared under identical environmental conditions (same diet, same water, same experimental facility); (ii) environment—comparing the prevalence of gonad malformations in whitefish of the same genetic origin reared in different water sources and/or fed with different diets; and (iii) gene-environment interaction—comparing the prevalence of gonad morphological alterations in relation to the combinations of genetics and environmental factors. Two diets were used for the rearing experiments: either zooplankton collected in Lake Thun which represents the natural diet of whitefish, or an artificial dry food which was used as control. The key finding of this study is that the inducing factor of the gonad malformations is contained in the zooplankton of Lake Thun. Fish fed with this diet developed a significantly higher prevalence of malformations than fish from any other treatment, irrespective of the genetic origin and/or the water source. This result could be repeated in the two independent experiments. Importantly, the prevalence values observed in the experimental fish fed with Lake Thun zooplankton were similar to the prevalence values recorded in free-ranging whitefish in the lake. The findings of this study advance the understanding of the causes of gonad morphological alterations in wild fish populations.
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Oktaviyani, Selvia, and Wanwan Kurniawan. "Aspek reproduksi ikan kakap Lutjanus vitta (Quoy & Gainmard, 1824) di Teluk Jakarta dan sekitarnya." Jurnal Iktiologi Indonesia 17, no. 2 (June 24, 2018): 215. http://dx.doi.org/10.32491/jii.v17i2.360.
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Study on reproductive aspects of brownstripe red snapper Lutjanus vitta (Quoy & Gainmard, 1824) in Jakarta Bay and its surroundings can obtain important information for fish resources management. The objective of this research is to analyze length frequency distribution, sex ratio, gonadal maturation, gonado somatic index, the length at first maturity (Lm) and the average length of captured (Lc) for this fish. This research was conducted from April 2014 to January 2015 with sampling location in Tanjung Pasir Fishing Port, Tangerang. Fish sampling and of fish that were. The observed aspects included fork length, weight, sex, gonad maturity and gonad weight was done monthly. The result showed that the fork length of this fish ranged between 132-265 mm with the equal sex ratio. The capture fish are dominated by fish with immature stage. The highest of gonado somatic index was on September 2014 (2%). The fork length at first maturity (Lm) were 252 mm (male) and 187 mm (female) while the average fork length of captured (Lc) was 178 mm. This condition can cause a growth overfishing. AbstrakKajian beberapa aspek reproduksi ikan kakap Lutjanus vitta (Quoy & Gainmard, 1824) di Teluk Jakarta dan sekitarnya dapat menghasilkan informasi yang sangat penting dalam rangka pengelolaan sumber daya ikan tersebut. Tujuan pene-litian ini adalah untuk menganalisis sebaran frekuensi panjang, nisbah kelamin, kematangan gonad, indeks kematangan gonad, ukuran kali pertama matang gonad, dan rata-rata panjang tertangkap ikan kakap. Penelitian dilaksanakan pada bulan April 2014 hingga Januari 2015 di Tempat Pelelangan Ikan (TPI) Tanjung Pasir, Tangerang. Aspek yang diamati meliputi panjang cagak dan bobot tubuh ikan, jenis kelamin, kematangan gonad, dan bobot gonad. Hasil penelitian me-nunjukkan bahwa ukuran panjang cagak ikan kakap berkisar antara 132-265 mm dengan nisbah kelamin dalam keadaan seimbang. Ikan kakap yang tertangkap didominasi oleh ikan yang belum matang gonad. Indeks kematangan gonad tertinggi terjadi pada bulan September 2014 yaitu 2%. Ukuran panjang cagak kali pertama ikan matang gonad (Lm) adalah 252 mm (jantan) dan 187 mm (betina), serta panjang cagak rata-rata tertangkap (Lc) adalah 178 mm. Kondisi ini dapat menyebabkan lebih-tangkap yang mengganggu tingkat pertumbuhan ikan kakap.
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Salgado-Ugarte, Isaías Hazarmabeth. "Reproduction and Condition Indices-Body Structures Adjusted Means Comparison of Silver Perch (Bairdiella chrysoura) from Tampamachoco Lagoon, Northeastern Mexico." International Journal of Zoology and Animal Biology 5, no. 3 (2022): 1–13. http://dx.doi.org/10.23880/izab-16000384.
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Background: The study of reproduction and condition are fundamental topics in fisheries science. To this aim, there are several methods including Gonadosomatic index, Condition factors (Fulton, Ricker, relative) and hepatosomatic index. These traditional methods present several drawbacks (ratio indices with variability and distribution problems; assumption of linear relationships and of independence from length, focus on the intercept of linear models, etc.). In this study, we present an application of the multivariate analysis of covariance (MANCOVA) to analyze reproduction and condition of Bairdiella chrysoura from Tampamachoco Lagoon compared with some traditional indexes. Methods: This comparison takes into account the biological data (lengths and weights) collection of 9,505 individuals of B. chrysoura registered during an annual period (May 1990- June 1991) at five localities in the Western side of the Tampamachoco Lagoon, Mexico. We compared Gonadosomatic index, Relative Condition Factor and Hepatosomatic index values to lengthadjusted means of gonad, eviscerated and liver weights from the multivariate analysis of covariance (MANCOVA) of females, males and indeterminate sex individuals. Results: High gonad, low hepatic and condition mean values (adjusted by MANCOVA) indicated the spawning period (February to March). The opposite trend among gonad weight with both, liver and somatic weights appears to indicate the metabolism focusing on gonad development for the onset of the spawning season. The patterns described by the adjusted means from MANCOVA were highly correlated and synchronic to the traditional index values. Conclusions: Therefore, the length-adjusted mean values of gonad, eviscerated body, and liver weights represent a useful alternative to the common ratio based estimators.
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Bradford, Rodney G. "Role of spawning condition in the determination of the reproductive traits of spring- and autumn-spawning Atlantic herring from the southern Gulf of St. Lawrence." Canadian Journal of Zoology 71, no. 2 (February 1, 1993): 309–17. http://dx.doi.org/10.1139/z93-043.
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Mature spring-spawning (May–June) and autumn-spawning (August–September) herring differ in total weight. Autumn herring have both heavier gonads and higher somatic weights at length. Both the residual levels of storage lipids and somatic weight at length, corrected for storage lipid, are higher in autumn than in spring. Within spawning seasons, males and females deplete the same amount of storage energy. Percent somatic lipid content is positively correlated with body size during spring but shows no relationship to body size in autumn. These patterns indicate that the relative allocation of storage energy to reproduction differs with spawning season. Spring spawners (lengthy gonad maturation period) allocate proportionally more storage energy to routine and active metabolism than autumn spawners (brief gonad maturation period). The low intercept and steep slope of the gonad weight – length relationship for spring spawners reflect the interaction between decreasing metabolic rate with body size and increasing storage energy capacity with body size. Egg weight is unrelated to the parent's somatic lipid content for either spawning group. Spawning history (recruit versus repeat spawning) has only a minor influence on egg weight.
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Shang, Wen-Hui, Jia-Run Han, Jia-Nan Yan, Yi-Nan Du, Yun-Sheng Xu, Chang-Feng Xue, Tie-Tao Zhang, Hai-Tao Wu, and Bei-Wei Zhu. "Quantitative Proteome Reveals Variation in the Condition Factor of Sea Urchin Strongylocentrotus nudus during the Fishing Season Using an iTRAQ-based Approach." Marine Drugs 17, no. 7 (July 5, 2019): 397. http://dx.doi.org/10.3390/md17070397.
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To investigate the variation in the condition factor of the sea urchin Strongylocentrotus nudus (S. nudus), gonads were collected in May (MAY), June (JUN), and July (JUL), at the beginning (AUG-b) and end of August (AUG-e). Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) detection of the gonads revealed an obvious enhancement of the band at about 37 kDa from July, which was identified as transforming growth factor-beta-induced protein ig-h3 (TGFBI) by nanoLC-ESI-MS/MS. Gonadal proteins were identified by isobaric tagging for relative and absolute quantitation (iTRAQ), and regulation of the identified proteins in pairs of the collected groups was observed. A total of 174 differentially expressed proteins (DEPs) were identified. Seven of the DEPs showed significant correlations with both the gonad index (GI) and protein content. These correlations included 6-phosphogluconate dehydrogenase, decarboxylating isoform X2 (6PGD), CAD protein, myoferlin isoform X8, ribosomal protein L36 (RL36), isocitrate dehydrogenase [NADP], mitochondrial isoform X2 (IDH), multifunctional protein ADE2 isoform X3, sperm-activating peptides (SAPs) and aldehyde dehydrogenase, and mitochondrial (ALDH). However, TGFBI had no correlation with gonad index (GI) or protein content. 6PGD, IDH, multifunctional protein ADE2 isoform X3, and ALDH were shown to interact with each other and might play key roles in changing the condition factor of S. nudus gonads.
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Styan, C. A., and A. J. Butler. "Asynchronous patterns of reproduction for the sympatric scallops Chlamys bifrons and Chlamys asperrima (Bivalvia: Pectinidae) in South Australia." Marine and Freshwater Research 54, no. 1 (2003): 77. http://dx.doi.org/10.1071/mf02019.
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Patterns of spawning activity were assessed by monitoring gonad states over 2.5 years for Chlamys asperrima and Chlamys bifrons at two sites in Gulf St Vincent, South Australia. Chlamys asperrima appeared to have a minor spawning in June, followed by a major spawning starting in late August. In contrast, the gonads of C. bifrons were regressed only during winter and it appeared that C. bifrons spawned for a long period, from late spring (September) until early autumn (March). At one site where sampling was frequent, there was evidence of three series of C. bifrons spawning events during the summer of 1994/95 and at least two series of events during 1995/96. Build-up and decrease in gonad weight was quick, but there was strong evidence of serial spawning for both species. Subsequently, we once observed C. asperrima spawning in situ at Edithburgh Jetty, at a time when gonad weights had been decreasing in previous years, but also long after the time when peak gonad weights had usually occurred. Only patches within the population were seen spawning, with scallops not spawning observed less than 100 m away from those that were. Indirect sampling of gonad condition also suggested that spawning in C. bifrons at Largs Bay was not always synchronous among patches of scallops within a population, nor always between sexes within patches.
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Werneck, P. R., N. M. M. Lopes, K. R. De Moraes, F. Faustino, and F. Morgado. "Histochemical Evaluation of Sexual maturation Phases in Solea solea Wild Marine Populations." Microscopy and Microanalysis 18, S5 (August 2012): 45–46. http://dx.doi.org/10.1017/s1431927612012883.
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The histological analyzes performed in gonad cells to verify the occurrence of changes in their anatomy is of crucial importance in order to characterize the dynamics of the gonads during the sexual maturation phase of its cells in specimens of wild marine populations. These histological data, together with other reproductive data, can be used in the monitoring of marine environments in which the Solea solea (Ishiba et al., 2008) lives, namely, the coastal waters of the Iberian Peninsula, Africa and Mediterranean sea (Ishiba et al., 2008). Therefore, the main objective of this study was to evaluate the several cellular types and its quantities and anatomies (Ishiba et al., 2008). The study was performed using a total of 19 specimens of the species Solea solea, collected between the months of January and March of 2011 in two different locations of the Portuguese coast (Aveiro and Leixões, Portugal). The gonad samples were fixated in Formalin-acetic acid-alcohol (FAA) and processed in accordance to the standard histology protocol (Culling et al., 1985). The slices of the gonads were colored with Haematoxylin and Eosin (H&E) (used in the study of the general structure of the gonads, as well as in the identification and localization of the different cellular types of the gonad epithelium). As a result of the study, we found 7 different types of gonad cells: I oogonia (It is not photographed ); II a Chromatin nucleolus oocytes (Fig.1. A); II b perinucleolar oocytes (Fig.1. B); III cortical alveoli oocytes (Fig.1. C); IV vitellogenic oocytes (Fig.1. D); V maturing oocyte (Fig.1. E); VI ovulated oocyte (Fig.1. F), (Hibiya, et al., 1995). The different cellular phases were found in all the gonad samples analyzed in this study and the results corresponded to those expected: a decrease in the size in the cells of the first cellular type, the oogonia and an increase in the size in the cells of all other cellular types found in the study. Histological and histochemical analyses of the Solea solea can be used in anatomic and pathological evaluations of the physiological condition of the animals, as stated previously for the muscles, where histological changes could be observed (such as: degeneration and atrophy of the muscle bundles). In the future, the analytical determination of histological and histochemical changes in the gonads of Solea solea, in conjunction with other analytical processes, such as in situ analyzes, can potentially be used to determine and accurately characterize the physiological condition of animals sampled in any natural environment.
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Williams, James R., and Russell C. Babcock. "Comparison of multiple techniques to evaluate reproductive variability in a marine bivalve: application to the scallop Pecten novaezelandiae." Marine and Freshwater Research 55, no. 5 (2004): 457. http://dx.doi.org/10.1071/mf03200.
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Reproduction and spawning of the scallop Pecten novaezelandiae were monitored at four sites in the Hauraki Gulf, New Zealand, from July 2000 to July 2001. A visual grading system based on the macroscopic appearance of the gonad was developed and tested, and changes in visual grade, quantitative histology, and standardised gonad mass were used to describe seasonal and spatial patterns in gametogenesis and spawning. Visual grade was significantly correlated with histological and gonad mass data (r 2 = 0.74–0.87) and validated as an accurate method for measuring reproduction in P. novaezelandiae. Visual grading facilitates rapid assessment of reproductive condition and can be conducted non-destructively, thus providing a tool allowing long-term studies of individual spawning behavior in relation to environmental signals. Scallops exhibited episodic spawning, with spawning events detected in spring, summer, autumn, and even early winter. Gonad recovery and subsequent gamete development and maturation were apparent between spawnings. Within-season variability in gonad size and condition could be the result of multiple (serial) spawnings during a season. The timing of spawning varied among populations, probably reflecting differences in environmental conditions that influenced reproduction. However, the largest spawning events occurred at all sites in early summer (December/January), coincident with wind-driven upwelling conditions.
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Mahmud, S., PV Mladenov, SC Chakraborty, and MAR Faruk. "Relationship Between Gonad Condition and Neurosecretory Cell Activity in the Green-Lipped Mussel, Perna canaliculus." Progressive Agriculture 18, no. 2 (March 2, 2014): 135–48. http://dx.doi.org/10.3329/pa.v18i2.18169.
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The relationship between the activity of neurosecretory cells and gonad development of Perna canaliculus was investigated. The variation in staining intensity of the neurosecretory cells in different ganglia was evaluated. Changes in staining intensity of neurosecretory cells (NSC) were correlated with gonad development. The variation in colour intensity (CI) resulted from differences in the amount of secretory materials within the NSCs. The neurosecretory cell types A and B showed a similar pattern of staining intensity, and showed correlation with gametogenesis and spawning. At the beginning of gonad development, these cells possessed very few granules and the number of granules in the cells increased with gonad maturation. The staining intensity decreased in A and B- cells just after spawning. Cell types C and D did not show any substantial changes in colour intensity with gonad changes.DOI: http://dx.doi.org/10.3329/pa.v18i2.18169 Progress. Agric. 18(2): 135 - 148, 2007
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Muzammil, Wahyu, Tri Apriadi, Winny Retna Melani, and Adrian Damora. "Bioinformation of Blue Swimming Crab (Portunus pelagicus) during Covid-19 Pandemic in Bintan District, Riau Islands Province." Journal of Tropical Fisheries Management 5, no. 2 (December 18, 2021): 65–72. http://dx.doi.org/10.29244/jppt.v5i2.34442.
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Riau Islands Province has high fishery potential because it is surrounded by sea water areas. One of high potential of fisheries is blue swimming crab commodity. Covid-19 pandemic in the world has affected various sectors, one of which is the blue swimming crab sector, therefore biological information (bioinformation) during this pandemic very useful for blue swimming crab sustainability, especially in Bintan District. This study aimed at providing bioinformation related to blue swimming crab during the covid-19 pandemic in Bintan Regency. The bioinformation includes size distribution, growth patterns, sex ratios, and maturity level of female crab gonads in Kawal and Pengujan waters (Bintan Regency). The carapace width of the blue swimming crab in Kawal ranges from 102,2–187,9 mm and carapace width in Pengujan ranges from 106,3–148,4 mm. The carapace width class mode was found at the mean class value of 130 mm (in Kawal) and 140 mm (in Pengujan). The growth patterns of both female and male crabs in Kawal and Pengujan are negative allometric. Based on the chi square test with a confidence level of 95% (α = 0,05), the sex ratio of female-male blue swimming crab in general both in Kawal and in Pengujan was in a balanced condition. The level of gonad maturity in female blue swimming crab in Kawal and Pengujan was found from level of gonad maturity 1 to 4 stages. In Kawal found 67% were mature gonad, 22% immature gonad, and 11% berried female. In Pengujan found 31% were mature gonad, 63% immature gonad, and 6% berried females.
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Sandström, O., E. Neuman, and P. Karås. "Effects of a Bleached Pulp Mill Effluent on Growth and Gonad Function in Baltic Coastal Fish." Water Science and Technology 20, no. 2 (February 1, 1988): 107–18. http://dx.doi.org/10.2166/wst.1988.0051.
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Growth and reproductive capacity in perch (Percafluviatilia L.) and roach (Rutilusrutilus (L.)) were studied during 1983, 1984 and 1985 in a coastal area of the Bothnian Sea affected by bleached pulp mill effluents. Comparative investigations were made at a mill producing unbleached pulp. In perch exposed to bleachery effluents effects were observed on length increase rates, somatic condition factors and on gonad development. The fraction of fishes displaying inhibited gonadal recrudescence was high close to the mill, and the size of developing gonads was comparatively small. Growth was faster in exposed fishes, in young-of-the-year as well as in older fish. Effects on length growth could be distinguished as far back as in 1975. Energy storage, expressed as the condition factor, was highest in exposed fishes. The effect pattern was more diffuse in roach, but examples of reduced gonad growth were noted. In conclusion, these studies provided evidence for changes in the energy allocation system in fish exposed to a bleached pulp mill effluent.
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Xie, Xuan, Ping Li, Martin Pšenička, Huan Ye, Christoph Steinbach, Chuangju Li, and Qiwei Wei. "Optimization of In Vitro Culture Conditions of Sturgeon Germ Cells for Purpose of Surrogate Production." Animals 9, no. 3 (March 21, 2019): 106. http://dx.doi.org/10.3390/ani9030106.
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To expand germ cell populations and provide a consistent supply for transplantation, we established basal culture conditions for sturgeon germ cells and subsequently increased their mitotic activity by eliminating gonad somatic cells, supplementing with growth factor, and replacing fetal bovine serum (FBS). The initial basal culture conditions were Leibovitz’s L-15 medium (pH 8.0) supplemented with 5% FBS (p < 0.001) at 21 °C. Proliferation of germ cells was significantly enhanced and maintained for longer periods by elimination of gonad somatic cells and culture under feeder-cell free conditions, with addition of leukemia inhibitory factor and glial-cell-derived neurotrophic factor (p < 0.001). A serum-free culture medium improved germ cell proliferation compared to the L-15 with FBS (p < 0.05). Morphology remained similar to that of fresh germ cells for at least 40 d culture. Germline-specific gene expression analysis revealed no significant changes to germ cells before and after culture. Sterlet Acipenser ruthenus germ cells cultured more than 40 days showed development after transplant into Russian sturgeon Acipenser gueldenstaedtii. Polymerase chain reaction showed 33.3% of recipient gonads to contain sterlet cells after four months. This study developed optimal culture condition for sturgeon germ cells. Germ cells after 40 d culture developed in recipient gonads. This study provided useful information for culture of sturgeon germ cells.
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Kudsiah, Hadiratul, Suwarni, Sri Wahyuni Rahim, Dwi Fajriyati Inaku, Muhammad Ahsin Rifa’i, and Sri Haslina. "Growth patterns and condition factors of the bungo fish, Glossogobius giuris (Buchanan, 1822) in Sidenreng Lake waters, Sidenreng Rappang Regency, South Sulawesi." IOP Conference Series: Earth and Environmental Science 1119, no. 1 (December 1, 2022): 012020. http://dx.doi.org/10.1088/1755-1315/1119/1/012020.
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Abstract Bungo fish is one of the potential fishery resources in Sidenreng Regency, which has decreased due to continuous fishing. Therefore, information on fisheries biology is needed to support the management of Bungo fish resources to create sustainable fishing. This study aims to analyze the growth patterns and condition factors of Bungo fish based on gender, observation time, and gonad maturity level. The use of this research as a source of information on the management of Bungo fish, especially in Lake Sidenreng. This research was conducted for three months, from September to November 2020. Sampling was obtained from 2 Bungo fishers in Sidenreng Lake, Sidenreng Rappang Regency, South Sulawesi. The number of bungo fish samples obtained during the study was 235, consisting of 163 male Bungo fish and 72 female Bungo fish. Based on the results of research that has been done, the growth pattern of male and female Bungo fish is negative allometric; namely, the increase in body length is faster than the increase in body weight of the fish. The condition factors of male and female Bungo Fish are classified as fish in good condition. The condition factor of bungo fish. Based on the sampling time, male and female Bungo fish in November and September were classified as flat or plump fish, while in October, male and female Bungo fish were classified as flat or not fat. Gonad maturity of male fish has a relatively smaller average condition factor than female fish at the same gonad maturity. The condition factors of male and female Bungo Fish are classified as fish in good condition. The condition factor of bungo fish. Based on the sampling time, male and female Bungo fish in November and September were classified as flat or plump fish, while in October, male and female Bungo fish were classified as flat or not fat. Gonad maturity of male fish has a relatively smaller average condition factor than female fish at the same gonad maturity. The condition factors of male and female Bungo Fish are classified as fish in good condition. The condition factor of bungo fish. Based on the sampling time, male and female Bungo fish in November and September were classified as flat or plump fish, while in October, male and female Bungo fish were classified as flat or not fat. Gonad maturity of male fish has a relatively smaller average condition factor than female fish at the same gonad maturity.
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Sergeeva, N. P., and A. I. Varkentin. "Maturation, scale of gonad maturation stages and reproductive cycle of Pacific saffron cod Eleginus gracilis, Tilesius (Gadiformes, Gadidae)." Researches of the aquatic biological resources of Kamchatka and the North-West Part of the Pacific Ocean 1, no. 65 (January 12, 2023): 5–25. http://dx.doi.org/10.15853/2072-8212.2022.65.5-25.
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Gonad size and weight dynamics and gonad-somatic index in the course of maturation have been analyzed, size structure and condition of oocytes of Pacific saffron cod at different stages of ovary matura- tion has been clarified. Reproductive cycle has been demonstrated, and scale of gonad maturation stages has provided.
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Hilário, Ana, Paul A. Tyler, and David W. Pond. "A new method to determine the reproductive condition in female tubeworms tested in Seepiophila jonesi (Polychaeta: Siboglinidae: Vestimentifera)." Journal of the Marine Biological Association of the United Kingdom 88, no. 5 (June 24, 2008): 909–12. http://dx.doi.org/10.1017/s0025315408001586.
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Vestimentiferan tubeworms are significant members of deep-sea chemosynthetically-driven communities, including hydrothermal vents and cold seeps. The reproductive condition in this taxon is rarely studied because of sampling constraints inherent to these environments, and the lack of a simple methodology to quantify gonad development in vestimentiferans.We demonstrate that the amount of gonad found in the first 10 mm of trunk can be used as representative of the reproductive condition of the individual, and we establish a linear relationship between the amount of gonad and the proportion of wax ester in the trunk of female vestimentiferans. This relationship represents a new method for the determination of the reproductive condition in this group.
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Rajasilta, Marjut. "Relationship between Food, Fat, Sexual Maturation, and Spawning Time of Baltic Herring (Clupea harengus membras) in the Archipelago Sea." Canadian Journal of Fisheries and Aquatic Sciences 49, no. 4 (April 1, 1992): 644–54. http://dx.doi.org/10.1139/f92-073.
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The effect of nutritional status on gonad maturation and timing of spawning was examined in the Baltic herring (Clupea harengus membras) in the Archipelago Sea. Fish were collected from overwintering areas in December and from the spawning grounds in May–July. Muscle fat content, amount of mesenteric fat, and condition factor were used as indicators of nutritional status of fish. In winter, fish were highly variable with substantial individual variation in nutritional status, gonad stage, gonad weight, and gonadosomatic index (GSI). Gonad weight was related to fat content, suggesting a close relationship with fish nutritional status and maturation rate. Spawning fish were separable into early and late spawners according to fat content, gonad weight, and GSI but not according to length. The spawning shoals consisted of mixtures of fish of all sizes. I concluded that in the study area, individual maturation cycles vary and timing of spawning is primarily determined by the feeding conditions prior to spawning.
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Santos, Alejandra Filippo Gonzalez Neves dos, Luciano Neves dos Santos, and Francisco Gerson Araújo. "Water level influences on body condition of Geophagus brasiliensis (Perciformes: Cichlidae) in a Brazilian oligotrophic reservoir." Neotropical Ichthyology 2, no. 3 (September 2004): 151–56. http://dx.doi.org/10.1590/s1679-62252004000300007.
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Effects of water level fluctuations on body condition of Geophagus brasiliensis were studied in a 30 km² Brazilian oligotrophic reservoir. Physiological condition (K) and gonadosomatic index (GSI) were compared according to water level (low and high). Females' best conditions were associated to higher resources availability during high water, since gonad development did not change between low and high water. Males' condition did not change between water levels, while the highest gonad development occurred in low water. Females presented higher reproductive investment than males, which allocated most of energy for somatic development. This strategy could be a mechanism to undergo the stress caused by oligotrophic characteristics of the reservoir enhanced during low water level.
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Christo, S. W., C. S. Ivachuk, A. L. Ferreira-Júnior, and T. M. Absher. "Reproductive periods of Lucina pectinata (BIVALVE; LUCINIDAE) in the Paranaguá Estuarine Complex, Paraná - Brazil." Brazilian Journal of Biology 76, no. 2 (March 1, 2016): 300–306. http://dx.doi.org/10.1590/1519-6984.12514.
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Abstract The objectives of the present study is to describe the size for exploitation and gonadal maturation of L. pectinata in Peças Island in Paraná coast. Twenty two individuals were sampled every month, from an intertidal flat of the Peças River, Municipality of Guaraqueçaba, during two periods – summer/autumn and winter of the 2009. Environmental parameter data was obtained at the same time of the biological sampling: temperature, salinity and seawater transparency at the Peças River mouth. The animals’ height, length, width, gross weight, wet weight of meat and dry weight of meat were measured at the lab. The gonad development stages (GDS), condition index (CI) and yield index (Y) were calculated. Sex identification was conducted by direct observation of the gonads and gametes under an optic microscope. Individuals were classified as males (M), females (F) or undetermined (U). The medium height observed was of 49.62 ± 6.84 mm. Period of more expressive gonad repletion were observed in summer when water temperature was higher. Results of GDS in both periods showed a predominance of partially filled gonad stages. This may be related with the fact that L. pectinata has intense gametogenesis activity, that is, the organisms do not have a resting interval, but go back to gonad restructuring rapidly after releasing the gametes. The continuity of the reproductive cycle of the specimens found in both studied periods could demonstrate a possible continuous reproduction of the species and a size for exploitation above 40.00 mm of height.
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Haddy, J. A., and N. W. Pankhurst. "Annual change in reproductive condition and plasma concentrations of sex steroids in black bream, Acanthopagrus butcheri (Munro) (Sparidae)." Marine and Freshwater Research 49, no. 5 (1998): 389. http://dx.doi.org/10.1071/mf97239.
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Changes in gonadosomatic index (GSI), hepatosomatic index (HSI), gonad stage and plasma concentrations of sex steroids were studied over one year in black bream (Acanthopagrus butcheri). Black bream have an annual reproductive cycle with a 3-month spawning season in spring–early summer. GSI and HSI values were highest in October and May respectively. Plasma concentrations of oestradiol-17β (E2), testosterone (T) and 17,20β-dihydroxy-4-pregnen-3-one (17,20βP) were highest in females in October. Plasma concentrations of E2 and T were highest in ovulated fish. Concentrations of 17,20βP were higher in fish undergoing final oocyte maturation (FOM) than in fish with regressed gonads. In males, plasma concentrations of T and 11-ketotestosterone (11KT) increased in September and remained elevated until January, but concentrations of 17,20βP did not change with season. However, 17,20βP concentrations in spermiated fish were higher than in non-spermiated fish. Daily changes in gonad condition indicated that females undergo daily cycles of ovarian maturation with ovulation occurring after midday. Plasma T and 17,20βP concentrations of females were elevated at midday in association with FOM, but E2 showed no diel change. In males, partially spermiated fish were dominant in the early morning and fully spermiated fish at midday. Plasma T, 11KT and 17,20βP concentrations were low at midnight and reached maximum levels at 0600 hours.
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Agustiari, Arinta Maulidina, Suradi Wijaya Saputra, and Anhar Solichin. "BEBERAPA ASPEK BIOLOGI IKAN SWANGGI (Priacanthus tayenus) YANG DIDARATKAN DI PPP TAWANG KABUPATEN KENDAL." Management of Aquatic Resources Journal (MAQUARES) 6, no. 1 (March 9, 2018): 33–42. http://dx.doi.org/10.14710/marj.v6i1.19808.
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ABSTRAK Pelabuhan Perikanan Pantai Tawang merupakan pelabuhan yang cukup besar di Kabupaten Kendal. Salah satu hasil tangkapan yang didaratkan yaitu ikan Swanggi (Priacanthus tayenus) merupakan jenis ikan demersal dengan karakteristik khusus berwarna merah muda, memiliki mata besar dan pada sirip perutnya terdapat bintik berwarna kehitam-hitaman. Tujuan penelitian ini adalah mengetahui aspek biologi ikan Swanggi meliputi struktur ukuran, hubungan panjang berat, faktor kondisi (Kn), ukuran pertama kali tertangkap (Lc50%), ukuran pertama kali matang gonad (Lm50%), tingkat kematangan gonad (TKG), indeks kematangan gonad (IKG), diameter telur, fekunditas dan upaya pengelolaan sumberdaya ikan Swanggi (Priacanthus tayenus). Penelitian dilaksanakan pada bulan Maret – April 2016. Metode penelitian adalah survei. Pengambilan sampel menggunakan metode random sampling atau acak. Hasil penelitian dilakukan pada ikan Swanggi sebanyak 625 ekor, pertumbuhan ikan Swanggi bersifat allometrik negatif dengan persamaan W = 0,00045L2,30701. Panjang ikan yang tertangkap selama penelitian berkisar antara 105 – 324 mm dan berat berkisar antara 22 – 205,2 gram. Nilai faktor kondisi adalah 1,106. Nilai Ukuran pertama kali tertangkap (Lc50%) adalah 152 mm.Ukuran pertama kali matang gonad (Lm50%) yaitu 153 mm. Ikan Swanggi jantan maupun betina sebagian besar belum matang gonad. Nilai TKG yang semakin tinggi akan diikuti dengan tingginya nilai IKG dan diameter telur juga semakin besar. Fekunditas tertinggi sebesar 245303 butir. Hubungan fekunditas terhadap panjang dan berat ikan Swanggi menunjukkan koefisien korelasi lemah. Kata Kunci : Ikan Swanggi (Priacanthus tayenus), Aspek Biologi, PPP Tawang ABSTRACT Tawang Coastal Fishing Port is a huge port in Kendal Regency. One of its hauls which was landed is Red Bigeye fish (Priacanthus tayenus). Which include in demersal fish with special characters; they have pink color, big eyes, and black spots around their pelvic fins. The purpose of this research is to find out the biological aspect of Red Bigeye fish from several aspects, i.e. size of the structure, relation of length and weight, the conditions factor (Kn), the size of the first caught (Lc50% ), the first time size of gonad maturity (Lm50%), gonad maturity level (TKG), index of gonad maturity (IKG), diameter of egg, fecundity, and management effort of Red Bigeye fish (Priacanthus tayenus) resources. The research was conducted in March – April 2016. The method used in this research is survey. In taking sample, this research use random sampling method. The result was done on 625 Swanggi fish. The growth of Red Bigeye fish is negative allometric with equation W = 0,00045L2,30701. The length of caught fish for the research are around 105 - 324 mm and weight around 22 – 205,2 gram. The value of condition factor is 1,106. The value of first time caught is 152 mm. The value of first time mature gonad (Lm50%) is 153 mm. Most male and female Red Bigeye fish are immature gonads. The higher TKG value will be followed by the higher IKG and egg diameter will be bigger. The highest fecundity is 245303 grain. The fecundity relation toward the weight of Red Bigeye fish shows weak correlation coefficient. Keywords : Swanggi Fish (Priacanthus tayenus), Biological Aspect, Tawang Coastal Fishing Port
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Khalil, Sarker M. Ibrahim, Kirtunia Juran Chandra, and David Rintu Das. "Effects of Endoparasitism of Heteropneustes fossilis on condition factor, gonad and blood composition of host." Research in Agriculture Livestock and Fisheries 1, no. 1 (February 23, 2015): 159–67. http://dx.doi.org/10.3329/ralf.v1i1.22379.
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Effects of endoparasitism of Heteropneustes fossilis on condition factor, gonad and blood composition of the host was conducted during July 2012 to June 2013. Fish samples were collected from various water bodies of Sylhet region. Total length, body weight, gonad weight and sex of hosts were recorded. Blood sample was collected from each fish. Six different species of parasites were identified from the hosts assessed as i). Euclinostomum multicaecum, ii) Allocreadium handiai, iii). Lytocestus indicus, iv). Pseudocaryophyllaeus heteropneustus, v). Procamallanus heteropneustus and vi). Paracamallanus equispiculus. Gonad weight, condition factors and blood parameters of H. fossilis were greatly affected with moderate infestations. The highest condition factor, 0.59, was found in uninfested fish and lowest, 0.45, in infested fish. Changes in the percent of haemoglobin and erythrocyte sedimentation rate (ESR) was also investigated. Percent loss of haemoglobin was 0.43 and erythrocyte sedimentation rate (ESR) was 5.19 mm/h. In general the health condition parameter due to effects of endoparasitism of the investigated fish was found negative impact for the culture production of the Singhi (Heteropneustes fossilis). DOI: http://dx.doi.org/10.3329/ralf.v1i1.22379 Res. Agric., Livest. Fish.1(1): 159-167, Dec 2014
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Duinker, Arne, Liv Håland, Peter Hovgaard, and Stein Mortensen. "Gonad development and spawning in one and two year old mussels (Mytilus edulis) from Western Norway." Journal of the Marine Biological Association of the United Kingdom 88, no. 7 (September 19, 2008): 1465–73. http://dx.doi.org/10.1017/s0025315408002130.
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Sexual maturation and spawning was followed in one and two year old rope cultured mussels (Mytilus edulis) from April to December. Development of gonad and storage tissue was followed using descriptive categories from histology, and development of total soft tissue was followed using meat yield and condition index.Both age groups were mature both during spring and autumn and had similar patterns of spawning and maturation. April and May were characterized by scattered spawning activity and accumulation of storage reserves at the same time, resulting in relative constant condition indices during this period. This was followed by ripening of the gonads and an increase in condition index that culminated in a spawning in late June. Parts of the population then entered a resting phase, while a part of the population underwent new maturation towards an autumn spawning in September. In December all the mussels had started the winter maturation.Condition index and meat yield were higher throughout the season in the one year old mussels. This was probably due to the sum of several factors, including differences in specific feeding rates and biomass density, rather than spawning.The present study is the first to compare the reproductive patterns over time of one and two year old mussels with reliable age determination, and provide information that there are no obvious differences in neither timing of gonad development nor spawning patterns between the age-classes.
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Kusumawardani, Ayudiana, Abdul Ghofar, and Wiwiet Teguh Taufani. "KAJIAN BIOLOGI PERIKANAN PADA CUMI – CUMI Photololigo duvaucelii (d’Orbigny, 1835) YANG DIDARATKAN DI TPI TAMBAK LOROK SEMARANG Study on Fisheries Biology of Indian Squid (Photololigo duvaucelii d’Orbigny, 1835) in TPI Tambak Lorok Semarang." Management of Aquatic Resources Journal (MAQUARES) 8, no. 1 (July 25, 2019): 9–18. http://dx.doi.org/10.14710/marj.v8i1.24221.
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ABSTRAK Photololigo duvaucelii merupakan salah satu jenis cumi – cumi yang memiliki nilai ekonomis penting di TPI Tambak Lorok Semarang. Produksi cumi – cumi merupakan hasil tangkapan dari alam, upaya penangkapan yang semakin tinggi dapat menyebabkan penurunan stok sumberdaya cumi – cumi. Perlu adanya kegiatan yang dapat melestarikan sumberdaya agar tetap berkelanjutan. Tujuan penelitian ini adalah untuk mengetahui aspek biologi P. duvaucelii di Tambak Lorok yang meliputi hubungan panjang berat, faktor kondisi, tingkat kematangan gonad, indeks kematangan gonad dan karakteristik pertumbuhan alometri. Penelitian ini dilaksanakan pada bulan April – Mei 2018. Metode pengambilan sampel yang digunakan dalam penelitian ini adalah random sampling. Analisis data yang digunakan adalah regresi linier sederhana dari log ML(mantle length) dan log W (weight) umtuk mengetahui hubungan panjang beratnya. Nilai hubungan panjang berat P. duvaucelii mempunyai persamaan W = 0,024L1,580pada jantan dan W = 0,003L2,043 pada betina dengan nilai slope (b) 1,580 dan 2,043. Nilai slope tersebut menunjukkan bahwa pertumbuhan P. duvaucelii bersifat allometrik negatif. Nilai faktor kondisi (Kn) 1,037 pada jantan dan 1,063 pada betina, nilai tersebut menunjukkan spesies ini tergolong memiliki badan yang kurus. Pertumbuhan panjang mantel (ML) P. duvauceliitumbuh lebih lambat dibanding organ tubuh lain, kecuali terhadap berat tubuhnya. Tingkat kematangan gonad yang paling dominan dari P. duvaucelii jantan dan betina adalah TKG I (belum matang gonad). ABSTRACT Photololigo duvaucelii is one of the commercially important squid resources in TPI Tambak Lorok Semarang. Squid production mainly comes from nature, high fishing effort can cause a decrease in squid resource stock. Cacth in squid fisheries must be accompanied by other activity which to be able to increase population whilst maintain sustainable resources of the squid. This work aimed to study on fisheries biological which included length – weight relationship, condition factor, gonad maturity and gonado somatic index, also to learn morphometry characteristic of the P. duvaucelii in Tambak Lorok Semarang. This study was done in April – Mei 2018. Sample were collected using simple random sampling. A simple linear regression was used to describe the relationship between the log ML (mantle length) and the log W (weight). The length – weight relationship was expressed as W = 0,024L1,580 for male and W = 0,003L2,043 for female. Slope value (b) shows the growth of P. duvaucelii was negatively allometric. Conditon factor values in this research amounted to 1,037 for male and 1,063 for female, the range of this condition factor showed that the species has a flat body shape. Growth for mantle length (ML) of P. duvaucelii slower than other organs, except with the body weight. Maturity stages of P. duvauceliimale and female in this research dominated by maturity stages I (immature).
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Viana, Douglas, Luciano Lazzarini Wollf, Tânia Zaleski, Silvia Romão, Gustavo Bertoldi, and Lucélia Donatti. "Population structure and somatic indexes of Hypostomus cf. ancistroides (Siluriformes, Loricariidae) collected from the Bonito river, Ivaí river basin, Turvo, Paraná." Brazilian Archives of Biology and Technology 51, no. 3 (June 2008): 493–502. http://dx.doi.org/10.1590/s1516-89132008000300008.
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This study aimed to provide information about the population structure and somatic index of Hypostomus cf. ancistroides collected from the Bonito river, located in the Ivaí river basin. The length-weight relationship was isometric for both the sexes. The length structure analysis showed that the larger individuals (from 18.1cm to 27.0cm in length) predominated, and the lowest abundances occurred at the size extremes (9.1-12cm and 27.1-30.0cm). The reproduction period occured between October and January for the females and between November and January for the males. The liver somatic index cannot be used as an indicator of the reproduction period in either of the sexes, due to no correlation between the liver somatic index and the gonad somatic index. The gonad weight exerted no influence on the monthly mean condition factor and the correlation between the condition factor and gonad somatic index was high. The condition factor could be an indicator of the reproduction period of this species.
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Fariña, Pablo Alvarez, and Ximo Gual-Arnau. "A STEREOLOGICAL ESTIMATION OF GONAD VOLUME AND OOCYTE NUMBER IN A SPECIMEN OF A NATIVE CLAM (VENERUPIS PULLASTRA)." Image Analysis & Stereology 25, no. 2 (May 3, 2011): 105. http://dx.doi.org/10.5566/ias.v25.p105-110.
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We obtained the gonad volume and oocyte number in a single Venerupis pullastra (Montagu, 1803) using unbiased stereological estimators. Since the gonad is not a fixed anatomical structure and is merged with other organs in the clam, we used new variance expressions to study the efficiency of these estimators, where the isotropy condition is not required for the covariogram.
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Kobayashi, Satoshi, and Miguel Vazquez Archdale. "Sexual traits and reproductive strategy of the leucosiid crab Pyrhila pisum." Journal of the Marine Biological Association of the United Kingdom 100, no. 6 (September 2020): 939–48. http://dx.doi.org/10.1017/s0025315420000776.
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AbstractMating strategy and sexual dimorphism of morphological traits of the leucosiid crab Pyrhila pisum were elucidated by analysing relative growth patterns of chelipeds and abdomen, and gonad development patterns. Male adults had long chelipeds compared with juvenile males and females. Among male adults, two phases with different slopes could be found in the regression lines; their chelipeds growth pattern changed from negative allometry to positive and longer chelipeds developed in large adults. The growth is more markedly expressed in the merus than in the propodus. Female adults had wider abdominal segments and a thicker body compared with juvenile females and males. Abdomen of females was greatly enlarged by a puberty moult. Male adults had well-developed gonads similar to female adults, and the weights of male gonads were often larger than those of females of the same body size. For adult males, a negative correlation was detected between carapace width and the weight ratio of their gonads, but no significant relationship was detected for adult females. Females had large and well-bloated seminal receptacles, whose weight was nearly equal to gonad weight. There was little difference in the amount of seminal receptacles regardless of the body size of females. There is a trade-off relationship in the development between chelipeds and gonads in adult males. Probably young adult males compensate for the disadvantageous condition of guarding by increasing the number of spermatozoids, and old adult males invest more of their energy to their chelae for guarding while decreasing investment in sperm production.
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Zamroni, Achmad, Adi Kuswoyo, and Umi Chodrijah. "ASPEK BIOLOGI DAN DINAMIKA POPULASI IKAN LAYANG BIRU (Decapterus macarellus Cuvier, 1833) DI PERAIRAN LAUT SULAWESI." BAWAL Widya Riset Perikanan Tangkap 11, no. 3 (December 7, 2019): 137. http://dx.doi.org/10.15578/bawal.11.3.2019.137-149.
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Ikan layang biru (Decapterus macarellus) merupakan salah satu jenis ikan pelagis kecil yang dominan tertangkap dan mempunyai nilai ekonomi yang tinggi, terutama untuk daerah dengan perairan yang lebih oseanik seperti di perairan Indonesia bagian timur. Tujuan penelitian ini adalah untuk mengidentifikasi parameter populasi ikan layang biru khususnya tertangkap di Laut Sulawesi. Pengambilan sampel ikan untuk diukur panjang cagak dan diamati kematangan gonad dilakukan secara acak setiap bulan. Informasi parameter populasi yang diperoleh dalam penelitian ini adalah hubungan panjang-berat, nisbah kelamin, tingkat kematangan gonad, nilai L50% dan Lm, parameter pertumbuhan serta tingkat pemanfaatan. Hasil penelitian menunjukkan bahwa sebaran ukuran panjang cagak ikan (fork length = FL) berkisar antara 10,25 - 32,25 cm, pola pertumbuhannya bersifat allometrik negatif. Nisbah kelamin ikan layang biru antara jantan : betina tidak berimbang yaitu 1 : 1,963. Ikan layang biru yang tertangkap didominasi oleh ikan dalam kondisi kematangan gonad tingkat III, artinya gonad masih dalam kondisi berkembang. Berdasarkan analisis tingkat kematangan gonad dan nilai indeks gonad dapat diketahui bahwa puncak musim pemijahan ikan terjadi pada bulan Maret. Perbandingan nilai L50% dan Lm diperoleh (L50% > Lm), artinya secara umum ikan telah mengalami matang gonad sebelum ikan tersebut ditangkap. Nilai eksplotasi lebih tinggi dari nilai eksploitasi optimal 0,5 per-tahun. Diduga puncak rekruitmen yang terjadi pada bulan Juni berasal dari musim pemijahan yang terjadi pada bulan Maret.Mackerel scad (Decapterus macarellus) is one of the dominant small pelagic fish species with high economic value, especially for areas with more oceanic waters such as eastern Indonesia. The purpose of this study was to identify the population parameters of the Mackerel scad especially those caught in the Celebes Sea. Fish samples were randomly taken to measure for length measurements and gonad maturity observation every month. Information on population parameters obtained in this study is the length-weight relationship, sex ratio, gonad maturity level, L50% and Lm values, growth parameters, and exploitation rates. The results showed that the distribution of fish length range from 10.25 - 32.25 cm of fork length, with the growth pattern was negative allometric. The sex ratio between males: females was not balanced (1: 1,963). The Mackerel scad caught was dominated by fish in the condition of level III maturity, meaning that each gonad was in a developing condition. Based on the analysis of gonad maturity and gonad index, it can be estimated that the peak of the spawning season occurs in March. A comparison of the values of L50% and Lm obtained was L50% > Lm, meaning that in general, the fish has reached gonad ripening before they were caught. The exploitation rate was higher than the optimal exploitation value of 0.5 per year. It is likely that the peak of recruitment occurred in June came from the spawning season occurred in March.
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Singh, A. B., and Chandra Mohini Chaturvedi. "Effect of altered thyroid and adrenal activity on the seasonal reproduction of the Indian palm squirrel, Funambulus pennanti." Canadian Journal of Zoology 71, no. 8 (August 1, 1993): 1558–61. http://dx.doi.org/10.1139/z93-220.
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Thiouracil and metyrapone administered during the progression phase of the annual reproductive cycle inhibited gonadal development in the Indian palm squirrel, Funambulus pennanti. In a further experiment, these drugs led to normal gonadal regression during the late breeding phase. Thyroxine and corticosterone treatment, on the other hand, maintained the gonads continuously in breeding condition, unlike those of controls, which exhibited characteristic post-reproductive regression. Since hypofunction of the thyroid and adrenal glands had inhibitory effects on the initiation of seasonal gonadal growth, and hyperactivity affects post-reproductive regression, it is suggested that an optimal level of hormones is required for the normal breeding cycle in this subtropical mammal. The results are discussed in terms of an interrelationship between the seasonal thyroid, adrenal, and gonad cycles under natural conditions.
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Leet, Jessica K., Catherine A. Richter, Robert W. Gale, Donald E. Tillitt, and Jill A. Jenkins. "Declines in Reproductive Condition of Male Largemouth Bass (Micropterus salmoides) Following Seasonal Exposure to Estrogenic Endocrine-Disrupting Compounds." International Journal of Molecular Sciences 23, no. 24 (December 17, 2022): 16131. http://dx.doi.org/10.3390/ijms232416131.
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Reproductive abnormalities, that could lead to possible effects at the population level, have been observed in wild fish throughout the United States, with high prevalence in largemouth bass (LMB; Micropterus salmoides) and smallmouth bass (Micropterus dolomieu). Estrone (E1) and atrazine (ATR) are common environmental contaminants often associated with agricultural land use. 17alpha-ethinylestradiol (EE2) is a contaminant associated with wastewater treatment effluent, and a representative, well-studied estrogen commonly used for fish toxicity testing. Our objective was to assess whether early gonad recrudescence in adult fish was a period of sensitivity for alterations in reproductive condition and function. Adult male LMB were exposed from post-spawning to early gonad recrudescence to either a mixture of E1 (47.9 ng/L) + ATR (5.4 µg/L), or EE2 (2.4 ng/L) in outdoor experimental ponds. Gonad samples were collected from fish just prior to the start of exposure (July), at the end of the exposure period (December), the following spring just prior to spawning (April), and post spawning (May). Gonadosomatic index (GSI) was significantly reduced in E1 + ATR-exposed and EE2-exposed males compared to control at every post-exposure time point. Reduced sperm count and sperm motility were observed in the mixture treatment (E1 + ATR) compared to the control. Sperm motility was also reduced in the EE2 treatment. These data together indicate that estrogenic endocrine-disrupting compounds can lessen the reproductive condition of adult male LMB, and that effects of exposure during early gonad recrudescence can persist at least through the subsequent spawning cycle.
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Trainavičius, Ignas, Darius Dasevičius, Birutė Burnytė, Robertas Kemežys, and Gilvydas Verkauskas. "Early Bilateral Gonadoblastoma in a Patient with Mixed Gonadal Dysgenesis (Karyotype 45,X/46,XY): Case Report and Review of Literature." Acta medica Lituanica 29, no. 2 (July 25, 2022): 5. http://dx.doi.org/10.15388/amed.2022.29.2.5.
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Background: Mixed gonadal dysgenesis is a rare congenital and challenging condition, characterized mainly by 45,X/46,XY karyotype mosaicism, asymmetrical gonadal development and various internal and external genital anatomy. Because of frequent disorder of genital development and a higher risk of germ cell neoplasia, management of these patients is complex and requires multidisciplinary approach.Case: We present a 45,X/46,XY mixed gonadal dysgenesis patient diagnosed with gonadoblastoma in both gonads after bilateral gonadectomy at 1 year of age.Conclusions: Because of high risk for malignant transformation, gonadectomy of a streak-like gonad and biopsy with orchidopexy or gonadectomy of a dysgenetic testicle is recommended at an early age.
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Osho, Friday Elijah, and Ridwan Abiola Usman. "Length-Weight Relationship, Condition Factor and Fecundity of African Snakehead Parachanna obscura from the Anambra River, South East Nigeria." Croatian Journal of Fisheries 77, no. 2 (June 1, 2019): 99–105. http://dx.doi.org/10.2478/cjf-2019-0011.
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Abstract The length-weight relationship, condition factor, fecundity, gonadosomatic and hepatosomatic indices of Parachanna obscura from the Anambra River were determined between December 2015 and June 2016. Eighty-three live samples of P. obscura were obtained from fishermen. Descriptive statistics, correlation and regression analysis were used to analyze the obtained data. The length-weight relationship had R values of 0.933, 0.843 and 0.896 for male, female and combined sexes, respectively. The b value of 3.133 for male and 2.674 for female were not significantly different (P>0.05). Mean condition factors of 0.89±0.33 and 0.80±0.21 were obtained for female and male, respectively. The largest number of eggs (10,965) was found in a female with the body weight of 154 g, gonad weight of 9.1 g and egg size of 1.3 mm, while the least fecund female with 1820 eggs weighed (94 g) and had a gonad weight 2.1 g with egg size of 1.0 mm. The hepatosomatic indices ranged between 0.55±0.20 and 0.64±0.29 in both male and female, respectively, while female gonadosomatic index average was 2.05±1.44. There was a positive correlation between fecundity and gonad weight.
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Abubakar, Salma, Mennofatria Boer, and ,. Sulistiono. "Aspek biologi reproduksi ikan pari blentik Neotrygon kuhlii di perairan Selat Sunda." Jurnal Akuakultur Indonesia 15, no. 2 (December 22, 2016): 189. http://dx.doi.org/10.19027/jai.15.2.189-197.
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<p class="BasicParagraph"><strong>ABSTRACT</strong></p><p class="BasicParagraph"> </p><p class="BasicParagraph">Bluespotted stingray fish <em>Neotrygon kuhlii</em> is the important fish economically captured from Sunda Strait. Intensive fishing could decrease bluespotted stingray stock. This study was aimed to know the length-weight, and reproduction characteristic. The reproduction characteristic covered the size of first gonad maturity, the level and also index of gonad maturity of bluespotted stingray fish in Labuan Fishing Dock, Banten. The result showed the equilibrium of length-weight of female fish was about W=0.0007L2,1496. Meanwhile, the male fish was about W=0.0000L2.251. Male fish was better than female fish according their relatively condition factor. Decreasing of the factor condition was caused by feeding habit to grow the reproduction cells. The size of first gonad maturity for the female and male respectively were about 550–799 dan 550–760 mm. The highest level maturity even female or male was on IV achieved in June and Juli 2013. Increasing the index (IKG) was followed by the level of gonad maturity.</p><p class="BasicParagraph"> </p><p class="BasicParagraph">Kata kunci: bluespotted stingray, reproductive characteristic, condition factor, Sunda Strait<strong></strong></p><p class="BasicParagraph"><strong> </strong></p><p class="BasicParagraph"><strong> </strong></p><p class="BasicParagraph"><strong>ABSTRAK</strong></p><p class="BasicParagraph"><strong> </strong></p><p class="BasicParagraph">Ikan pari blentik <em>Neotrygon kuhlii</em> merupakan salah satu sumberdaya ikan ekonomis penting dan sebagai hasil penangkapan di Selat Sunda. Penangkapan yang intensif dapat mengakibatkan penurunan stok ikan pari blentik. Penelitian ini bertujuan untuk mengetahui panjang bobot, dan karakteristik reproduksi. Karaktersitik reproduksi itu sendiri meliputi ukaran pertama kali matang gonad, tingkat kematangan gonad dan indeks kematangan gonad ikan pari blentik di perairan Selat Sunda yang didaratkan di Pelabuhan Perikanan Pantai (PPP) Labuan, Banten. Berdasarkan hubungan panjang bobot ikan pari betina diperoleh persamaan hubungan panjang dan bobot untuk ikan pari blentik betina W=0,0007L2,1496. Sementara itu pada ikan jantan, persamaan hubungan panjang bobot W=0,0000L2,251. Ikan pari blentik jantan mempunyai faktor kondisi yang relatif lebih besar daripada ikan pari betina. Penurunan nilai faktor kondisi disebabkan bagian terbesar dari makanan yang dikonsumsi digunakan untuk perkembangan sel-sel reproduksinya. Kisaran ukuran pertama kali matang gonad ikan pari blentik betina 550–799, sedangkan untuk ikan pari jantan adalah dengan kisaran panjang total tubuh 550–760 mm. Tingkat kematangan gonad tertinggi ikan betina dan jantan (TKG IV) ditemukan pada bulan Juni dan Juli 2013. Indeks kematangan gonad (IKG) ikan pari semakin meningkat seiring dengan meningkatnya TKG.</p><p class="BasicParagraph"><strong> </strong></p><p>Keywords: ikan pari blentik, karakteristik reproduksi, faktor kondisi, Selat Sunda</p>
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Dody, Safar, Fia Sri Mumpuni, and Wahid Madi. "Hubungan Panjang-Berat, Nisbah Kelamin, dan Indeks Kematangan Gonad Kerang Darah (Anadara granosa LINN. 1758) di Perairan Muara Gembong – Bekasi." JURNAL MINA SAINS 4, no. 2 (January 11, 2019): 67. http://dx.doi.org/10.30997/jms.v4i2.1517.
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This research was conducted in the waters of Muara Gembong, Bekasi, on January to March, 2018. Sampling of blood cockle is carried out in 3 station vertically to the direction of the sea. Determination of station is carried out based on the fishing ground of the fisherman. Analyses of blood cockle is carried out in the Laboratory of the Research Center for Oceanography, LIPI, Ancol – North Jakarta. This research was aimed to analyze the reproductive biological aspects which includes the ratio of gender, the gonad maturity rate, the gonad maturity index, the length-weight relationship, the condition factor of Anadara granosa in the waters of Muara Gembong, Bekasi. The results of observation of 400 samples showed that the length-weight relationship of blood cockle of female and male has the pattern of the negative allometric relationship. The overall ratio of gender between the blood cockle of male and female is 1.3:1. The average value of the gonad maturity index of the male blood cockle is 1.1874 and the value of the gonad maturity index of the female blood cockle is 1.1983. Key words: Anadara granosa, growth, the ratio of gender, gonad maturity index
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Warren-Myers, Fletcher, Stephen E. Swearer, Kathy Overton, and Tim Dempster. "Stocking density and rearing environment affect external condition, gonad quantity and gonad grade in onshore sea urchin roe enhancement aquaculture." Aquaculture 515 (January 2020): 734591. http://dx.doi.org/10.1016/j.aquaculture.2019.734591.
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Rachmanto, Dwi, Djumanto Djumanto, and Eko Setyobudi. "Reproduction of Indian Mackerel Rastreliger kanagurta (Cuvier, 1816) in Morodemak Coast Demak Regency." Jurnal Perikanan Universitas Gadjah Mada 22, no. 2 (December 30, 2020): 85. http://dx.doi.org/10.22146/jfs.48440.
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Indian mackerel is a group of small pelagic fish that has high economic value and is ecologically important. The catch of Indian mackerel in the Morodemak Coastal Fishing Port of Central Java has decreased within 2016-2018, which is suspected by overexploitation. This study aims to observe the reproduction of Indian mackerel. Fish samples were collected from the catches of the mini purse seine operated by fishermen in April-June 2019. The fish samples were measured their length and weight individually, then the abdomen dissected to collect gonad, and counted in sub-sample of the egg number. Data were analyzed to determine the length-weight relationship of fish, sex ratio, gonad maturity level (GML), gonad maturity index (GMI), the size of the first gonad matured, and the egg number in each gonad brood fish. The results showed a negative allometric length relationship, and the length-weight relation equation in female fish was W = 0.038 L 2.59 and in male was W = 0.178 L 2.03. The value of fish condition factors in males, and females obtained values ranging from 1-2. The proportion of fish in GML III ranges from 27.2 to 82.5%, while GML IV ranges from 3.6 to 33.8%. Fish GMI ranged from 0.17 to 4.75%. The eggs number ranged from 11.235 to 40.878 grain. The female Indian mackerel get the first gonad matured at the size of 15.2 cm.
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Kembaren, Duranta Diandria, and Tri Ernawati. "BEBERAPAASPEKBIOLOGI IKANKUNIRAN (Upeneus sulphureus) DI PERAIRANTEGALDANSEKITARNYA." BAWAL Widya Riset Perikanan Tangkap 3, no. 4 (February 3, 2017): 261. http://dx.doi.org/10.15578/bawal.3.4.2011.261-267.
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Ikan kuniran (Upeneus sulphureus)merupakan salah satu ikan demersal dari familiMullidae banyak tertangkap di perairan Laut Jawa. Penelitian ini tentang beberapa aspek biologi ikan kuniran di perairan Tegal dan sekitarnya dilakukan pada bulan Maret, April, dan Agustus 2009. Penelitian ini bertujuan untuk mengkaji beberapa aspek biologi ikan kuniran, seperti nisbah kelamin, sebaran frekuensi panjang, hubungan panjang dan bobot, tingkat kematangan gonad, panjang pertama kali matang gonad (length at first maturity), dan faktor kondisi. Ikan yangdiamati 358 ekor yang terdiri atas 170 jantan dan 188 betina. Perbandingan jumlah ikan jantan dan betinamenunjukanrasio kelamin yang tidak seimbang. Berdasarkan atas sebaran frekuensi panjang, ikan dengan panjang 9 cmFL mendominansi hasil tangkapan pada bulan Maret dan April dan pada bulan Agustus didominansi ikan dengan panjang 11 cmFL. Pertumbuhan ikan kuniran pada bulan Maret bersifat allometrik negatif, sedangkan pada bulan April danAgustus bersifat isometrik.Analisis tingkat kematangan gonad menunjukan bahwa pada bulan Agustus banyak ditemukan tingkat kematangan gonad I dan II dan pada bulanMaret banyak ditemukan tingkat kematangan gonad III dan IV. Ikan kuniran diduga pertama kali matang gonad pada ukuran panjang 9,87 cmFL. Faktor kondisi menunjukan tidak ada perbedaan antara bulan Maret, April, dan Agustus. The silver goatfish (Upeneus sulphureus) is demersal fish which caught excessively in the Java Sea and taxonomically belong to the family Mullidae. Some biological aspects of the silver goatfish in Tegal and adjacent waters were studied on March, April, and August in 2009. The objective of this research were to know some biological aspects, i.e. sex ratio, length frequency distribution, length weight relationship, gonad maturity stage, length at first maturity, and condition factor. A total of 358 fishes that consisted of 170 males and 188 females were examinated their biological aspects. The composition of male and female showed an unequal sex ratio. According to the lenght frequency distribution, the fishes of 9 cmFL were dominant onMarch and April, while on August was dominated by the fishes of 11 cmFL. The growth characteristic of the silver goatfish were allometric negative on March and isometric on April and August. Gonad maturity stage level 1 and 2 were dominant on August and level 3 and 4 onMarch. Lenght at first maturity (Lm) of silver goatfish were 9,87 cmFL. The condition factor showed that there is no difference on March, April, and August.
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Nasution, Siti Aminah, and Rivo Hasper Dimenta. "BIOECOLOGY OF GIANT FRESHWATER PRAWNS (MACROBRACHIUM ROSENBERGII) IN THE BILAH RIVER, LABUHANBATU DISTRICT, NORTH SUMATERA." BIOLINK (Jurnal Biologi Lingkungan Industri Kesehatan) 8, no. 2 (February 14, 2022): 133–45. http://dx.doi.org/10.31289/biolink.v8i2.5191.
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Giant freshwater prawns (Macrobrachium rossenbergii) were still been the favorite prawn catch of local fishermen in the Labuhanbatu district. This raises concerns for the survival of these animals. Therefore, it is necessary to conduct a study to obtain bioecological information on this giant freshwater, giant prawns in the Bilah river especially inform about condition the abundance based on gonad maturity levels, and the growth patterns of Giant freshwater prawns (M. rossenbergii). This study was conducted at 3 stations around the Bilah river. These stations were determined using a purposive sampling method. Furthermore, sampling was carried out using fishing nets. After that, the caught fish were analyzed to find out the Fulton’s condition factor, the abundance of prawns based on gonad maturity levels, and the growth patterns. The results of growth patterns analysis which calculate from the relationship of carapace length and body weight of M. rossenbergii caught were showed negative allometric category (b value 1.88 to 2.577). Meanwhile, the abundance of giant freshwater prawns based on gonad maturity levels for males and females were dominated by immature prawns (ranging from 46.15 to 54.65%).
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Jossie Konoyima, Komba, and Lahai Duramany Seisay. "Aspects of Reproductive Biology of Pseudupeneus prayensis collected from the coast off Sierra Leone, West Africa." Journal of Applied Biosciences 159 (March 31, 2021): 16371–81. http://dx.doi.org/10.35759/jabs.159.2.
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Objective: The study assessed aspects of reproductive biology of Pseudupeneus prayensis in Sierra Leone, aimed to support efficient management of its fishery. Methodology and Results: One hundred and seventy one (171) specimens were randomly collected from January-June 2016 on-board a demersal trawler. Gonad stages were assessed macroscopically and absolute fecundity determined by gravimetry.Total length and weight were measured using a meter rule (cm) and weight balance (g) respectively. Results showed dominant males (56 %) with no significant difference between gender populations (p < 0.05), and female spawning gonads were exceptionally dominant in March and April. The estimated length at first sexual maturity (male, L50% = 19.6 cm; female, L50% =17.2 cm) was 30.7 % and 38.6 % less than the maximum length (Lmax = 28 cm) respectively. Besides, Gonadosomatic Index of both sexes peaked in March and May whereas Hepatosomatic Index was at peak in April and May for females, and in April and June for the males. Both sexes showed consistently high Index of condition (K >1.0). Fecundity positively correlated with size (r >0.9) and ranged from 160 000 eggs (total length, 17cm; somatic weight, 65g) to 522 079 eggs (total length, 25 cm; somatic weight, 150g). Conclusion and application of results: Sex ratios portrayed homogeneity in gender population of Pseudupeneus prayensis and females were key spawning indicators with notable spawning gonads in March and April. Moreover, both sexes of P. prayensis had delayed first sexual maturity with major spawning in March and May aided by well-developed liver (HSI) and improved conditions (K > 1.0). Besides, fecundity in Pseudupeneus prayensis increased with size, and female specimens were highly productive. The results of this study can be used to institute closed fishing seasons in the event of threat on the spawning biomass of the stock of P. prayensis in Sierra Leone. Keywords: Absolute fecundity, gonad, maturity, somatic, spawning.
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Jossie Konoyima, Komba, and Lahai Duramany Seisay. "Aspects of Reproductive Biology of Pseudupeneus prayensis collected from the coast off Sierra Leone, West Africa." Journal of Applied Biosciences 159 (March 31, 2021): 16371–81. http://dx.doi.org/10.35759/jabs.159.2.
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Objective: The study assessed aspects of reproductive biology of Pseudupeneus prayensis in Sierra Leone, aimed to support efficient management of its fishery. Methodology and Results: One hundred and seventy one (171) specimens were randomly collected from January-June 2016 on-board a demersal trawler. Gonad stages were assessed macroscopically and absolute fecundity determined by gravimetry.Total length and weight were measured using a meter rule (cm) and weight balance (g) respectively. Results showed dominant males (56 %) with no significant difference between gender populations (p < 0.05), and female spawning gonads were exceptionally dominant in March and April. The estimated length at first sexual maturity (male, L50% = 19.6 cm; female, L50% =17.2 cm) was 30.7 % and 38.6 % less than the maximum length (Lmax = 28 cm) respectively. Besides, Gonadosomatic Index of both sexes peaked in March and May whereas Hepatosomatic Index was at peak in April and May for females, and in April and June for the males. Both sexes showed consistently high Index of condition (K >1.0). Fecundity positively correlated with size (r >0.9) and ranged from 160 000 eggs (total length, 17cm; somatic weight, 65g) to 522 079 eggs (total length, 25 cm; somatic weight, 150g). Conclusion and application of results: Sex ratios portrayed homogeneity in gender population of Pseudupeneus prayensis and females were key spawning indicators with notable spawning gonads in March and April. Moreover, both sexes of P. prayensis had delayed first sexual maturity with major spawning in March and May aided by well-developed liver (HSI) and improved conditions (K > 1.0). Besides, fecundity in Pseudupeneus prayensis increased with size, and female specimens were highly productive. The results of this study can be used to institute closed fishing seasons in the event of threat on the spawning biomass of the stock of P. prayensis in Sierra Leone. Keywords: Absolute fecundity, gonad, maturity, somatic, spawning.
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Rachmawati, Puput Fitri, and Sri Turni Hartati. "ASPEK BIOLOGI IKAN LAYUR (Lepturacanthus savala Cuvier, 1829) DI PERAIRAN PANGANDARAN, JAWA BARAT." BAWAL Widya Riset Perikanan Tangkap 9, no. 2 (December 6, 2017): 133. http://dx.doi.org/10.15578/bawal.9.2.2017.133-143.
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Sumberdaya ikan demersal di perairan Pangandaran mendominasi hasil tangkapan sebesar 32,90 % dari total produksi ikan secara keseluruhan, pada tahun 2015 jenis ikan layur (Lepturacanthus savala) berkontribusi sebanyak 47,31 % dari total produksi ikan demersal, merupakan salah satu jenis ikan demersal yang bernilai ekonomis tinggi. Penelitian ini bertujuan untuk mengetahui aspek biologi dan parameter populasi L. savala di perairan Pangandaran. Penelitian dilakukan pada bulan Juni – Desember 2015, data yang terkumpul meliputi panjang dan berat ikan, jenis kelamin, tingkat kematangan gonad, berat gonad, serta data statistik perikanan. Analisis parameter populasi didasarkan pada data length-frequency panjang dan dilakukan dengan bantuan program FiSAT II (FAO-ICLARM Stock Assesment Tools II). Hasil menunjukkan hubungan panjang-berat bersifat alometrik negatif dengan nilai b = 2,92; nisbah kelamin jantan terhadap betina 1,0:3,2. Panjang rata-rata ikan tertangkap lebih besar dari panjang pertama kali matang gonad (L50% = 57,19 cmTL > Lm = 47,23 cmTL). Panjang asimtotik (L) sebesar 111,00 cmTL, laju pertumbuhan (K) sebesar 0,56/tahun. Selanjutnya laju kematian total (Z) sebesar 3,46/tahun, laju kematian alami (M) sebesar 0,85/tahun, dan laju kematian akibat penangkapan (F) sebesar 2,61/tahun; sehingga laju eksploitasi (E) sebesar 0,75, terindikasi kondisi fully exploited. Jika dibiarkan kondisi tersebut dapat mengarah pada recruitment overfishing. Untuk menjaga keberlangsungan kelestarian sumberdaya L. savala, pengelolaan dapat dilakukan dengan cara membatasi intensitas penangkapan, memperbesar ukuran mata jaring, dan penetapan kawasan reservat terhadap sejumlah stok induk yang memadai. The fish production in the Pangandaran waters dominated demersal fish resources by 32.90% of total landed in 2015. Savalai hairtail contributes 47,31% to total demersal fish production. This study aims to determine the biological aspects and population parameters of Lepturacanthus savala in Pangandaran waters. Data collection conducted in June - December 2015, with data collected including length and weight, sex, the maturity level of gonads, gonad weight, and fishery statistics data. Population parameter analysis based on length-frequency data was done by using FAO-ICLARM Stock Assessment Tools II (FiSAT II) program. The result shows a negative allometric growth pattern (b = 2,92) and sex ratio of male to female has a ratio of 1,0: 3,2. The average length of the fish is caught is greater than the length of the first mature gonad (L50% = 57,19 cmTL> Lm = 47,23 cmTL). Analysis of fish population parameter obtained asymptotic length (L) = 111,00cmTL, growth rate (K) = 0,56/year, total mortality rate (Z) = 3,46/year, natural mortality rate (M) = 0,85/year, catch mortality rate (F) = 2,61/year, so that the rate of exploitation (E) = 0,75, indicated fully exploited condition. If left unchecked, the condition may lead to recruitment overfishing. To maintain the sustainability of L. savala resources, management can be done by limiting the intensity of catching, maximazing the mesh size, and determining the reserved area against a sufficient number of parent stocks.
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Mansaray, A., and K. J. Konomiya. "Sex ratio, gonad maturity and size-structure of Pagelus bellotti in Sierra Leone." Journal of Applied Sciences and Environmental Management 24, no. 12 (February 16, 2021): 2153–59. http://dx.doi.org/10.4314/jasem.v24i12.22.
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A total of 135 specimens of Pagellus bellotti were randomly collected from artisanal boats in August 2018. Study of sex ratio, gonad maturity and size-structure of Pagellus bellottii is meagre in Sierra Leone, and forms the basis of the present study. The study will contribute to current knowledge and promote rational exploitation of the stock. Length and weight were measured using a fish measuring board (cm) and digital weight scale (g) respectively. Sex and gonad maturity were macroscopically assessed. Results showed dominant males (71.9%) and significant difference observed (1:2.6) and expected (1:1) female: male sex ratios (p <0.05). Only 11.9% and 11.1% of male and female gonads transcended to the developed stage (Stage IV). The length-frequency distribution for combined sex was unimodal (modal class, 17cm-20.9cm). Mean length and weight respectively were, 19.04±0.32cm and 98.85±5.08g for males and 17.43±0.54cm and 78.61±6.32g for females. Growth exponent (b) for male, female and combined sex was 2.809, 2.928 and 2.850 respectively and the correlation coefficient for all sex categories showed (r > 0.9). Indexes of condition were greater than 1.0 (K > 1) for all sex categories. Results portrayed a heterogeneous gender population of Pagelus bellottii and vast similarity in reproductive strategies by both sexes. The fish comprised of one size group and males may be growing larger than the females. Growth pattern was near-isometric for females and negative allometric for the males, and both sexes were in better condition (K >1.0). An annual study could provide further insight.
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Lee, Sung Ryul. "Laparoscopic Repositioning of Gonads from the Labia Majora or Inguinal Canal into the Abdominal Cavity in Pediatric Complete Androgen Insensitivity Syndrome Patients with Inguinal Hernia." Sexual Development 14, no. 1-6 (2020): 33–39. http://dx.doi.org/10.1159/000514070.
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Androgen insensitivity syndrome (AIS) is a congenital condition characterized by a 46,XY karyotype but with a female phenotype caused by mutations in the androgen receptor gene located on the X chromosome. In patients with complete AIS (CAIS), preservation of the gonad is recommended until puberty, and gonadectomy can be regarded subsequently. The location of the gonads should be considered, because positions in the labia majora or inguinal canals can cause discomfort. Here, the laparoscopic reposition of gonads into the abdominal cavity in pediatric patients with CAIS is reported. From 2013 to 2019, laparoscopic inguinal hernia repair was performed in 2,061 pediatric patients with inguinal hernias aged <10 years and with female external genitalia. Among them, 11 had CAIS. Gonads located in the labia majora or inguinal canal were repositioned into the abdominal cavity. The mean age was 18.9 months (range 1–110 months). The gonads were located in the inguinal canal in 7 patients, in the labia majora in 3, and in the abdominal cavity in 1. Laparoscopic repositioning of such gonads into the abdominal cavity is feasible in pediatric patients with an inguinal hernia and CAIS.
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Sinaga, Febrina, Ferdinand F. Tilaar, and Nego E. Bataragoa. "Characteristics of Reproduction of Yellowstripe Scad Selaroides leptolepis (Cuvier, 1833) In Manado Bay Waters." JURNAL ILMIAH PLATAX 6, no. 2 (July 31, 2018): 46. http://dx.doi.org/10.35800/jip.6.2.2018.20622.
Full textAbstract:
The waters of Manado Bay are areas that have a lot of biological resources. One of these resources is Yellowstripe scad (Selaroides leptolepis). The research was aimed to find out the reproduction characteristics of Yellowstripe scad (Selaroides leptolepis) by looking at male and female sex ratio, growth pattern with male and female condition factor, maturity level of gonad (TKG), gonad maturity index (IKG), size at first maturity, and fecundity. The location of fish sampling is taken from the catch of fishermen in Manado Bay waters in not April-May 2018. Fish sampling using random draw method withdrawal. The number of samples is 200, taken four times in two months (April to May 2018). The sex ratio of Yellowstripe scad (Selaroides leptolepis) in the waters of Manado Bay is balanced. The growth pattern of male is positive allometric, while females is isometric. The condition of male and female fish are 0.9 and 1.3 respectively. The Yellowstripe scad breeding season in Manado Bay waters takes place after the fourth week in April. The size of the first time ripe gonad Yellowstripe scad male and female 189 mm. The fecundity ranged from 1,960 - 29,145 with an average of 11,716 ± 6,088.Keywords: Yellowstripe scad, reproductive biology, Manado Bay ABSTRAKPerairan Teluk Manado adalah perairan yang memiliki sumberdaya hayati cukup banyak. Salah satu sumberdaya di perairan tersebut yaitu ikan Selarkuning (Selaroides leptolepis). Penelitian itu bertujuan untuk mengetahui karakteristik reproduksi ikan Selarkuning (Selaroides leptolepis) dengan melihat dari rasio kelamin jantan dan betina, pola pertumbuhan dengan faktor kondisi pada jantan dan betina, tingkat kematangan gonad (TKG), indeks kematangan gonad (IKG), ukuran pertama kali matang gonad, dan fekunditas. Sampel ikan diambil dari hasil tangkapan nelayan di perairan Teluk Manado pada bulan April-Mei 2018. Pengambilan sampel ikan menggunakan metode penarikan secara acak berlapis. Jumlah sampel sebanyak 200 ekor, diambil empat kali dalam dua bulan. Berdasarkan uji Chi-square, rasio kelamin ikan Selarkuning (Selaroides leptolepis) di perairan Teluk Manado adalah seimbang. Pola pertumbuhan ikan Selarkuning yaitu bersifat allometrik positif, sedangkan betina bersifat isometrik dengan rata-rata faktor kondisi ikan jantan dan betina mencapai 0,9 dan 1,3. Musim pemijahan ikan Selarkuning di perairan Teluk Manado berlangsung setelah minggu keempat pada bulan April. Ukuran pertama kali matang gonad ikan Selarkuning jantan dan betina 189 mm. Fekunditas ikan Selarkuning berkisar antara 1.960 – 29.145 butir dengan rata-rata 11.716 ± 6.088.Kata kunci: ikan Selarkuning,biologi reproduksi, Teluk Manado
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Suwarni, Farah Nilamsari Kadir, Joeharnani Tresnati, Hadiratul Kudsiah, and Sri Wahyuni Rahim. "The length weight relationship and condition factors of Tank Goby Glossogobius giuris Hamilton, 1822 in Lapompakka Lake, Wajo Regency, South Sulawesi." IOP Conference Series: Earth and Environmental Science 1119, no. 1 (December 1, 2022): 012026. http://dx.doi.org/10.1088/1755-1315/1119/1/012026.
Full textAbstract:
Abstract Lapompakka lake is one of the inland waters located in Tanasitolo District, South Sulawesi. Tank goby is one of the main commodity fish in Lake Lapompakka. This study aims to analyze the length-weight relationship and condition factors based on sex, observation time, and gonad maturity of tank goby. The results of this research are expected to provide information on growth patterns and conditions factor of tank goby so that they are useful in determining sustainable management and utilization efforts for tank goby conservation. This research was conducted for three months (September - November). Tank goby samples were obtained from 2 fishermen who were fishing in Lapompakka Lake. Analysis was conducted at the Laboratory of Fisheries Biology, Department of Fisheries, Faculty of Marine and Fisheries Sciences, Hasanuddin University. The number of fish was 212 individuals, composed of 153 males and 59 females. The results of the analysis, the growth patterns of male (b = 2.4667) and female (b = 2.3770) tank goby have a negative allometric growth pattern, which indicates the increase in body length is faster than the increase in body weight of the tank goby. The value of the condition factor indicates that the tank goby is in good condition and are in the fat or plump category that the condition factor of the tank goby increase along with an increase in the level of gonad maturity.