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1
Courtney, AJ. "Occurrence and influence of bopyrid parasites on female penaeid prawns from coastal waters of central Queensland (Australia)". Marine and Freshwater Research 42, nr 6 (1991): 615. http://dx.doi.org/10.1071/mf9910615.
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The prevalence of bopyrid isopods, parasitic on penaeid prawn hosts, is recorded for the first time from a central Queensland prawn trawl fishery. The bopyrid parasite Parapenaeon prox. expansus has been recorded for the first time from the red spot king prawn, Penaeus longistylus, and the blue-legged king prawn, Penaeus latisulcatus. Previous unpublished reports of Parapenaeon japonicum parasitizing P. longistylus have also been substantiated. Parasite species were not randomly associated with all prawn species but rather were associated with a single prawn host species or species group. The factors that give rise to such specific host-parasite associations, particularly the host-selective behaviour of the parasite and the habitat preferences of the juvenile prawns, are discussed. Bopyrids had no significant effect on the weight of the prawns, but they did have a significant effect on ovary weight and histology, causing sterility in their hosts. High levels of infestation have been recorded from other fisheries (resulting in reduced spawning potential of the host population), but the low prevalence (0.32%) of bopyrid parasites in central Queensland prawns appears to be so low as not to present a concern at present.
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Favaro, Brett, Stefanie D. Duff i Isabelle M. Côté. "A trap with a twist: evaluating a bycatch reduction device to prevent rockfish capture in crustacean traps". ICES Journal of Marine Science 70, nr 1 (8.08.2012): 114–22. http://dx.doi.org/10.1093/icesjms/fss138.
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Abstract Favaro, B., Duff, S. D., and Côté, I. M. 2013. A trap with a twist: evaluating a bycatch reduction device to prevent rockfish capture in crustacean traps. – ICES Journal of Marine Science, 70:114–122. Bycatch, or the incidental capture of non-target species, occurs in fisheries around the world, with often detrimental ecological consequences. Bycatch reduction devices (BRDs) that increase catch specificity have been used successfully in some fisheries, and the development of such devices remains an important component of the global effort to reduce bycatch rates. We tested novel devices designed to exclude juvenile rockfish (Sebastes spp.) from traps used to catch spot prawns (Pandalus platyceros), a commercially important species in British Columbia, Canada. The devices included reductions in trap opening sizes and novel bent-tunnel openings. Reducing trap opening size did not affect bycatch rates of rockfish or other non-target fish species. In contrast, bent-tunnel BRDs eliminated rockfish bycatch, and two of the bent-tunnel variants also excluded other fish species. However, prawn catch rates were reduced in all modified gear, and large prawns were often excluded more than small prawns. Videos recorded in situ revealed that prawn attempts to enter traps took longer and were more likely to fail in BRD-equipped than in unmodified traps. We conclude that bent-tunnel BRDs have the potential to be useful, but improvements are needed to increase prawn catch to levels similar to that of unmodified traps.
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Ward, TM. "Sea snake by-catch of prawn trawlers on the northern Australian continental shelf". Marine and Freshwater Research 47, nr 4 (1996): 631. http://dx.doi.org/10.1071/mf9960631.
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This paper describes and compares the sea snakes caught by vessels that target tiger prawns and endeavour prawns or that target the banana prawns Penaeus merguiensis and P. indicus. In 1989-90, 5203 sea snakes (14 species; 7 unidentified specimens) were purchased from fishers who trawled between Koolan Island and Cape York and participated in a dedicated carcass-tagging and data-collection programme. Hydrophines (11 species) represented 86.7% of the total catch. Aipysurines (3 species) represented 15.0% of specimens from vessels that targeted tiger prawns or endeavour prawns, but only 1.1% of specimens from vessels that targeted the banana prawns P. merguiensis and P. indicus. Prawn trawlers that operated between Koolan Island and Cape York during 1990 caught approximately 81 080 (� 13 670) sea snakes. Vessels that targeted tiger/endeavour prawns, P. merguiensis and P. indicus caught approximately 69260 (� 8750), 7200 (� 3250) and 4620 (� 1120) sea snakes respectively. The results emphasize the advantages of interactions between fishers and scientists and the need to assess separately the impacts of the three fisheries that constitute the northern prawn fishery.
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Tirtadanu, Tirtadanu, Suprapto Suprapto i Ali Suman. "SEBARAN FREKUENSI PANJANG, HUBUNGAN PANJANG-BERAT, TINGKAT KEMATANGAN GONAD DAN RATA-RATA UKURAN PERTAMA KALI MATANG GONAD UDANG PUTIH (Penaeus merguiensis De Man, 1888) DI PERAIRAN KOTABARU, KALIMANTAN SELATAN". BAWAL Widya Riset Perikanan Tangkap 9, nr 3 (30.01.2018): 145. http://dx.doi.org/10.15578/bawal.9.3.2017.145-152.
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Pengusahaan udang putih (Penaeus merguiensis De Man, 1888) di perairan sekitar Kotabaru memerlukan upaya pengelolaan agar perikanan udang dapat berkelanjutan.Salah satu informasi penting yang diperlukan sebagai dasar dalam pengelolaannya yaitu aspek biologi.Tujuan penelitian adalah mengkaji sebaran frekuensi panjang, hubungan panjang-berat, tingkat kematangan gonad dan rata-rata ukuran pertama kali matang gonad udang putih di perairan sekitar Kotabaru. Pengumpulan data diperoleh dari tempat pendaratan udang di Kotabaru pada bulan Januari – November 2016. Metode pengambilan sampel yang digunakan adalah random sampling. Hasil penelitian menunjukkan ukuran udang putih yang tertangkap cenderung kecil dengan ukuran berkisar antara 14 - 46 mmCL dan rata-rata sebesar 26 ± 3,7 mmCL pada udang jantan dan 28,5 ± 5,3 mmCL pada udang betina. Pola pertumbuhan bersifat allometrik negatif dan telah terjadi penurunan bobot dibandingkan beberapa tahun sebelumnya. Proporsi tertinggi udang matang gonad terjadi pada bulan Maret sehingga diduga merupakan puncak pemijahan udang putih.Ukuran pertama kali tertangkap udang (Lc = 28,1 mmCL) lebih kecil dibandingkan ukuran pertama kali matang gonad (Lm = 35,3 mmCL) sehingga sebagian besar udang yang tertangkap belum melakukan pemijahan. Dalam rangka menjaga keberlanjutan sumberdaya udang putih di Kotabaru, disarankan melakukan penutupan penangkapan di bulan Maret dan penggunaan alat tangkap ramah lingkungan dengan ukuran minimum tertangkap lebih besar dari 35 mmCL atau kurang dari 27 ekor dalam 1 kg.The exploitation of banana prawn (Penaeus merguiensis De Man, 1888) in Kotabaru Waters need management strategy, so the prawn fisheries in Kotabaru waters could be sustainably exploited. The important information needed for its basis management are was biological aspects of banana prawn. The aim of this research were to study about length frequency, length-weight relationship, maturity stages and length at first first mature of banana prawn in Kotabaru Waters. The research was conducted at landing site of prawn in Kotabaru and the samples were collected in January – November 2016. The method used for sampling was random sampling. The results showed that the size of banana prawn tend to become smaller with the size between 14-46 mmCL and the mean size were 26 ± 3,7 mmCL for male and 28,5 ± 5,3 mmCL for female. The growth pattern of banana prawn was allometric negative and the weights decreased from the previous years. The highest proportion of mature prawns was in March, likely suggestes to be the spawning season of banana prawn. Length at first captured of banana prawns (Lc = 28,1 mmCL) was lower than length at first matured (Lm = 35,3 mmCL) so most of prawns captured has not spawn yet. For sustainability of banana prawn resources in Kotabaru Waters, it is suggested to close fishing season in March and minimum legal size should be bigger than 35 mmCL or less than 27 prawns in 1 kg.
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Sutrisno, Bagus Oktori, i Slamet Budi Prayitno. "BENEFITS OF MANGROVE MANAGEMENT FOR PRAWN FISHING AND TIMBER PRODUCTION". Indonesian Fisheries Research Journal 19, nr 2 (31.12.2013): 107. http://dx.doi.org/10.15578/ifrj.19.2.2013.107-113.
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Integrated fisheries resource management is absolutely needed to achieve optimal result and sustainable utilization. This research aims to analyze the benefit of mangrove forest management for prawn fishing and mangrove timber production in Segara Anakan, southern coast of Central Java. The information concerning mangrove coverage changes was achieved from a satellite imagery (Landsat) from 2002 to 2009, while prawn resources stock assessment was analyzed through production surplus method and economic analysis of prawn fishing. The results show that the condition of mangrove ecosystem in Segara Anakan since 2002 to 2009 had been decreasing with average decrease rate of 10,28% each year which caused to prawn abundance. Utilization of mangrove wood inwhich aged above 20 years would give more benefit to prawn fishing and timber production. The additional economic value for prawn fishing was approximately 3,964 times of cropped woods. Prawn fisheries resource management in Cilacap coastal waters could be done by management of fishing effort and rehabilitation of mangrove forest in Cilacap region and surrounding areas as well especially in Segara Anakan Lagoon.
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Somers, IF. "Manipulation of fishing effort in Australia's penaeid Prawn Fisheries". Marine and Freshwater Research 41, nr 1 (1990): 1. http://dx.doi.org/10.1071/mf9900001.
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The potentially detrimental side-effects of prawn trawling are coming under increasing scrutiny in Australian waters, particularly in such ecologically sensitive areas as Queensland's Great Barrier Reef, and various restrictive measures are being suggested. Before changes are imposed on the prawning industry, the effects of trawling on the target prawn species and the long-term management of these effects need to be fully understood. Using a simulation model of a simplified prawn fishery, this paper describes the basis for the current regulatory mechanisms for Australian's prawn fisheries, in particular the manipulation of both the level and pattern of fishing effort. It is shown that even in moderately fished stocks, the fishery manager has several options, such as seasonal and nursery area closures, that are consistent with the goal of minimizing the impact of prawn trawling, while in no way penalizing the industry economically. With these in mind, possible ways of resolving or reducing the conflict with groups outside the prawning industry are discussed.
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Somers, IF, IR Poiner i AN Harris. "A study of the species composition and distribution of commercial penaeid prawns of Torres Strait". Marine and Freshwater Research 38, nr 1 (1987): 47. http://dx.doi.org/10.1071/mf9870047.
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Fishermen's logbook data were used to describe the distribution of fishing effort and the composition of the commercial catches in Torres Strait. Catches consist of tiger, endeavour and king prawns. Additional information on the distribution and abundance of the individual species was obtained from four trawl surveys carried out at 3-monthly intervals during 1985. Each survey extended over the entire area of the commercial prawn fishery in Torres Strait. The species composition of the trawl surveys (48% tiger, 44% endeavour and 8% king) differed noticeably from that of the commercial catch (60% tiger, 36% endeavour, 4% king). This difference was attributed to a combination of the commercial fishery's concentration on the higher-priced tiger prawns and the different spatial and temporal distributions of the species. The tiger prawn catch consisted of two species, Penaeus esculentus (99.6%) and P. semisulcatus (0.4%). The king prawn catch comprised P. longistylus (97.5%) and P. latisulcatus (2.5%). The endeavour prawn catch was represented by a single species, Metapenaeus endeavouri. Spatial differences in the species distributions were found to be associated with the distribution of bottom sediments. Tiger prawns were most abundant on fine sediments with a mud content greater than 50%; P. semisulcatus was restricted to sediments with a mud content greater than 70%. The king prawns, unlike the tiger prawns, were most abundant on the coarse sediments with a mud content less than 20%. Endeavour prawns were the most widespread of all the species, being equally abundant on all sediment types.
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Abrantes, Kátya, i Marcus Sheaves. "Sources of nutrition supporting juvenile penaeid prawns in an Australian dry tropics estuary". Marine and Freshwater Research 60, nr 9 (2009): 949. http://dx.doi.org/10.1071/mf08269.
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Prawn fisheries are among the main sources of income in several tropical countries, where juveniles of many species inhabit estuarine wetlands. Although plants in these wetlands are considered to be essential food sources for juvenile prawns, some studies suggest that wetland producers are of limited importance. In the present study, δ13C and δ15N were used to identify differences in diet between penaeid species and size classes, and to determine if terrestrial wetland producers are important for nutrition. Two estuarine floodplain pools were sampled: one surrounded by mangroves and one surrounded by salt marsh. There were differences in diet between species and size classes. As mangrove δ13C (–29.7 to –26.3‰) was very different from salt marsh δ13C (–16.3 to –15.4‰), the importance of these producers was examined by comparing the isotopic composition of the prawns between sites and by using the IsoSource model. Although aquatic sources were the most important, salt marsh grass was also a significant contributor, supporting the hypothesis that these wetland producers are important for juvenile prawn nutrition. There was no evidence that mangrove material was of major importance for any species, suggesting that mangrove productivity is not the primary reason for the occurrence of penaeid prawns in mangrove habitats.
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Pervin, R., M. A. Wahab, K. Fatema i M. S. R. Khan. "Effects of addition of mola at different densities on production of giant freshwater prawn". Journal of the Bangladesh Agricultural University 10, nr 1 (8.10.2012): 163–67. http://dx.doi.org/10.3329/jbau.v10i1.12109.
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The effects of mola (Amblypharyngodon mola) at different densities in polyculture with freshwater prawn (Macrobrachium rosenbergii) were investigated at the Fisheries Field Laboratory, Bangladesh Agricultural University, Mymensingh. The experiment had three treatments, viz. prawn + 1 mola m-2, prawn + 1.5 mola m-2 and prawn + 2 mola m-2 and were treated as T1, T2, and T3, respectively with three replications in each. Prawn stocking density was same (3 juvenile m-2) in all treatments. Feeds were applied twice daily for prawn. Assuming 80% survival, feeding rates were gradually reduced to 10-5% of body weight from the beginning to the last month. Water quality parameters (except transparency, chlorophyll-a) did not vary significantly (P>0.05). Weight gain, SGR (% body weight), gross and net production of prawn were not significantly different (P>0.05). Higher total production was recorded in T3 (574.61 ±39.58 kg ha-1) followed by TI (531.65±42.40 kg ha-1) and T2 (514.75±77.91 kg ha-1). It was found that addition of mola at different densities had no effects on survival and production performance of prawn. Therefore, nutrient-dense mola may be stocked as an additional species with freshwater prawn. It might be concluded that treatment T3 was better proposition for prawn-mola polyculture. DOI: http://dx.doi.org/10.3329/jbau.v10i1.12109 J. Bangladesh Agril. Univ. 10(1): 163167, 2012
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IMBIRIBA, Luan Campos, Diego Maia ZACARDI, Severino Adriano de Oliveira LIMA i Raniere Garcez Costa SOUSA. "LENGTH-WEIGHT RELATIONSHIP OF THE SIX MOST ABUNDANT FISH SPECIES IN PRAWN FISHERY SEMI-FIXED TRAP BYCATCHES IN THE LOWER AMAZON REGION (PARÁ, BRAZIL)". Boletim do Instituto de Pesca 47 (2021): e628. http://dx.doi.org/10.20950/10.20950/1678-2305/bip.2021.47.e628.
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In this study, the length-weight relationships (LWR) were estimated for six fish species captured during prawn fishing in the Lower Amazon region (Pará, Brazil). Prawn fishing boosts the socioeconomic development of riverine communities and is a relevant activity as a source of income and subsistence in this region. In addition, we registered new LWRs for the species Ossancora punctata and Hypoptopoma elongatum. The samplings were performed in prawn catches monthly from February 2018 to January 2019, using a “matapi”, which consists of a semi‑fixed trap that has a galvanized iron structure (2.5 m height by 2.0 m in length) and nylon mesh (1.40 x 1.60 mm mesh), and has two tapered openings to facilitate the entry and trapping of the prawn. The results show that 75% of the fish caught as prawn bycatches had not yet reached sexual maturity. Thus, it is clear that fisheries need to develop fishing gear that allow small fish to escape from the traps during the prawn fishery.
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Stobutzki, Ilona, Margaret Miller i David Brewer. "Sustainability of fishery bycatch: a process for assessing highly diverse and numerous bycatch". Environmental Conservation 28, nr 2 (czerwiec 2001): 167–81. http://dx.doi.org/10.1017/s0376892901000170.
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In tropical prawn (shrimp) trawl fisheries it is daunting to assess the sustainability of bycatch species because they are diverse and there is little historical and biological information for quantitative stock assessments. We developed a process to examine the likely impact of prawn trawling on the sustainability of bycatch species and applied this to fish bycatch in the Australian Northern Prawn Fishery. The 411 fish bycatch species were ranked with respect to biological and ecological criteria that contributed to two overriding characteristics, namely first, their susceptibility to capture and mortality due to prawn trawling, and second the population's capacity to recover after depletion. The rank of each species on these two characteristics determined its relative capacity to sustain trawling, and therefore its priority for research and management. Species that were the least likely to be sustainable came from the families Apogonidae, Ariidae, Bathysauridae, Callionymidae, Congridae, Diodontidae, Labridae, Opisthognathidae, Plotosidae, Synodontidae and Tetraodontidae. These species are highly susceptible to capture by trawls, they are benthic or demersal, their primary habitat is soft sediments, and their diet may include prawns. The recovery capacity of these species is also low, with the estimated removal rate by trawling high. The species that were the most likely to be sustainable came from the families Carangidae, Clupeidae, Ephippidae, Scombridae, Sphyraenidae and Terapontidae. They are less susceptible to capture by trawls, they are generally pelagic, their primary habitat is not in trawl grounds, and they have a broad depth distribution and range in the fishery. These species also have a greater capacity to recover, as most individuals have bred before capture, and a low estimated removal rate by trawling. The final ranking of the species must be used with caution because of the assumptions made in the process. However, the process is a valuable first step towards ensuring the sustainability of the bycatch species. Because of the simplicity of the process, it can be readily used in fisheries, particularly those with diverse bycatch, to manage the sustainability of their bycatch.
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Fatema, K., MA Wahab, R. Pervin, MSR Khan i HC Roy. "Comparison of Growth and Production Performance between Male and Female Giant Freshwater Prawn in Combination with Mola". Journal of Environmental Science and Natural Resources 4, nr 2 (22.03.2012): 137–42. http://dx.doi.org/10.3329/jesnr.v4i2.10163.
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An experiment was conducted to compare growth and production performance between all-male and all-female giant freshwater prawn (Macrobrachium rosenbergii) in combination with mola (Amblypharyngodon mola) at the Fisheries Field Laboratory, Bangladesh Agricultural University, Mymensingh, Bangladesh. The research was carried out for a period of 120 days in nine earthen ponds with an average depth of 1.2 m. The experiment had three treatments, viz. polyculture of all-male prawn with mola (stocking density 20,000 ha-1), monoculture of all-male prawn and monoculture of all-female prawn were treated as T1, T2, and T3, respectively with three replications of each and prawn stocking density was 30,000 ha-1 in all the treatments. Formulated sinking feeds were applied twice daily for prawn, and assuming 80% survival feeding rates were gradually reduced to 10-5% of body weight from the beginning to the last month. All water quality parameters (except transparency, chlorophyll-a and plankton) did not vary statistically significantly (P>0.05) among the treatments. Survival of prawn in respective of gender was lower in monoculture than in polyculture with mola, but did not vary significantly (P>0.05). Considering growth and production performance in all treatments, the male prawn showed better growth and production performance than female prawn and the highest gross and net production was recorded in treatment T1, therefore, polyculture of all-male prawn with mola is better than monoculture.DOI: http://dx.doi.org/10.3329/jesnr.v4i2.10163 J. Environ. Sci. & Natural Resources, 4(2): 137-142, 2011
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Suman, Ali, Ap’idatul Hasanah, Tri Ernawati i Andina Ramadhani Putri Pane. "THE POPULATION DYNAMIC OF BANANA PRAWN (Penaeus merguiensis de Man) IN TANAH LAUT WATERS, SOUTH KALIMANTAN". Indonesian Fisheries Research Journal 23, nr 1 (17.10.2017): 17. http://dx.doi.org/10.15578/ifrj.23.1.2017.17-22.
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Scientific advices on population dynamic of banana prawn (P. merguiensis de Man) are required as an input to support an apropriate fisheries management. This study aims to identify the population parameters of the banana prawn in Tanah Laut waters. The study was conducted in Tanah Laut based on monthly enumeration data (January to November 2016). Results has been shown that the length size of carapace at first maturity of banana prawn was 43.39 mm. Sex ratio of males and females was 1 : 0.8. The chi square test indicated that comparison of male and female of the banana prawn was significantly different. It means that there was not balance in number between males and females. The spawning season of banana prawn in Tanah Laut waters happened throughout year and reached the peak on November (south-east monsoon). The growth parameter of banana prawn was 1.05/year with maximum carapace length (Loo) of 55.0 mm. Instantaneous total mortality (Z) and natural mortality (M) were 6.05/year and 1.58/year, respectively. While fishing mortality (F) and exploitation rate (E) respectively were 4.47/year and 0.74/year respectively. The exploitation rate of banana prawn in Tanah Laut waters was high. Therefore, fishing effort of the banana prawn in that waters should be reduced to about 48 % for next coming year.
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Darmansah, Aris, Sulistiono, Thomas Nugroho i Eddy Supriyono. "Pemberdayaan Masyarakat melalui Pengembangan Polikultur Bandeng dan Udang di Desa Karangsong, Indramayu, Jawa Barat". Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat 2, nr 2 (22.02.2017): 92. http://dx.doi.org/10.29244/agrokreatif.2.2.92-99.
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Karangsong Village is one of the coastal villages in Indramayu which has a high fishery and marine resources potential, (both capture and aquaculture fisheries). The aquaculture activities in this village were mostly milkfish and prawn cultures. Community development through polyculture activity in this village had been done for 2 years 4 months from December 2012 to April 2015. This activity aimed to improve the community skill, especially milk fish and prawn using polyculture system. Methode used in this activity was training and empowering. The community was trained about pond culture preparation and milk fish and prawn culture methods. The community participated in first year was 4 people, and second year was 9 people. Aid distribution scheme of this program was 1 package for each fish-farmer contained prawn seed, milkfish seed, and fish-prawn feed. Through effectively empowering program, people knowledge, technology, biomass farming, and income (912 million from milkfish farming; 920 million from shrimp farming) were increased.
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Kennelly, Steven J. "The Development and Introduction of By-catch Reducing Technologies in Three Australian Prawn-Trawl Fisheries". Marine Technology Society Journal 33, nr 2 (1.01.1999): 73–81. http://dx.doi.org/10.4031/mtsj.33.2.11.
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Three tasks are usually required to introduce new technologies that reduce by-catches in commercial fisheries: (i) identify and quantify the particular by-catch issue that requires the new devices; (ii) develop and test the devices; and (iii) implement the devices into industry by voluntary acceptance and/or legislation. To solve by-catch problems in prawn-trawl fisheries in three regions of Australia, different approaches have been followed with varying success, and their comparison identifies an ideal framework under which such problems can be resolved.In northern Australia’s prawn-trawl fisheries, the main by-catch issues involved turtles and the discard of a large diversity offish species. To quantify these issues, data were obtained from research vessels, industry logbooks and samples from fishers. Before and during this work, modified gears were developed and tested in a flume tank and in the field using research vessels and, to a lesser extent, commercial vessels. Next, a separate project was established to encourage acceptance of the new technologies by industry and involved workshops, newsletters and a library that lent out various by-catch reducing devices to fishers. Voluntary acceptance of the new gears is currently estimated to be 50‐80% in some ports and 0‐20% in others, and a three-phase plan for their legislation is due to occur between 1999 and 2002.In New South Wales, the main by-catch issue was the large number of undersize fish discarded by prawn trawlers as they caught prawns and other species of retained by-catch. Firstly, observer programmes on commercial vessels were used to identify and quantify size- and species-specific by-catches. Then, modifications to fishing gears that reduced the identified problematic by-catches were developed and tested on chartered commercial fishing vessels. Next, involving fishers in this work (and workshops, posters, videos, etc.) led to the voluntary acceptance of the new modifications by the majority of fishers (estimated to be 100% in some fisheries and 50‐100% in others). Finally, the new devices were made mandatory by legislation in several fisheries, with the others to follow within 12 months.In South Australia’s Gulf St. Vincent, the chief by-catch issue mainly came from the prawn-trawl industry itself and concerned the by-catch of small prawns and fish. The approach used was to begin gear-development research without any formal quantification phase. After preliminary trials by industry, only five days of formal tests of new devices were required to recommend a design that was optimal for industry’s (and management’s) requirements. Within two weeks of the completion of the field trials, 100 of the industry was using this new gear voluntarily and its legislation is planned to occur within the next few years to ensure continued compliance.The simple pattern that emerges from these examples is that the sooner industry is fully involved in all stages of the work (driving the issue, quantifying it, developing devices and implementing them), the sooner and more complete is the voluntary acceptance of by-catch reducing fishing technology, and the more painless is the implementation of the relevant legislation.
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Die, David J., i Nick Ellis. "Aggregation dynamics in penaeid fisheries: banana prawns (Penaeus merguiensis) in the Australian Northern Prawn Fishery". Marine and Freshwater Research 50, nr 7 (1999): 667. http://dx.doi.org/10.1071/mf98124.
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In the Gulf of Carpentaria, banana prawns (Penaeus merguiensis) form dense aggregations that are targeted by trawl vessels with the help of small aeroplanes and colour sounders. Such aggregating behaviour is rare in penaeids and may lead to a change in catchability when stock abundance changes. Commercial logbook data containing trawl-tow records have been used to identify the location, time of capture and biomass of over 600 banana prawn aggregations during 1991–92. The number of aggregations decreased by 83% in the first three weeks of the fishing season. The average biomass of an aggregation decreased even more rapidly than the number of aggregations and, after three weeks of fishing, it had been reduced by 93%. The apparent decrease in the biomass of aggregating prawns during the first three weeks of the season is, therefore, in the order of 99%. This is considerably greater than the 66% decrease that can be estimated from catch per unit of effort data. It also suggests that catchability is directly related to stock abundance. Assessment models that assume that catchability is independent of stock size may not be appropriate for the assessment of the status of common banana prawns in this fishery.
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Ali, ML, MA Sattar i MA Baten. "Copper Contamination of Different Prawn Farms at Shatkhira District". Journal of Environmental Science and Natural Resources 4, nr 2 (22.03.2012): 105–9. http://dx.doi.org/10.3329/jesnr.v4i2.10157.
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Copper (Cu) contamination of six prawn farms under three upazilas of Satkhira district were evaluated. Total 54 water, sediment and prawn samples were collected from six farms, 18 samples from each category were examined to observe the Cu contamination of water, sediment and prawn. Cu was determined by Atomic Absorption Spectrophotometer at the central laboratory of Bangladesh Agricultural University and toxicity laboratory of Bangladesh Fisheries Research Institute, Mymensingh. The levels of Cu in water sample, sediment sample and samples of prawn species were collected from different surface and ground sources. The concentration of Cu in sediment samples were ranged from 45.3895 to 127.8771 ?g-1 and the average mean concentration was 76.92101 ?g-1. The concentration of Cu in prawn was ranged from 16.1069 to 97.3841 ?g-1 and the average mean concentration was 51.2342 ?g-1. The copper concentration in water ranged from 0.0309 to 0.0702 ppm. Cu concentrations in those samples were higher in sediment than prawn, but very lower concentration was found in water sample. The Cu in sediment samples were present higher amount than allowable limit. So prawn was mostly affected by contaminated water and sediment.DOI: http://dx.doi.org/10.3329/jesnr.v4i2.10157 J. Environ. Sci. & Natural Resources, 4(2): 105-109, 2011
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Lima, Jô de Farias, Thibério Carvalho da Silva, Luis Mauricio Abdon da Silva i Jamile da Silva Garcia. "Brachyuran crustaceans from the bycatch of prawn fisheries at the mouth of the Amazon river". Acta Amazonica 43, nr 1 (marzec 2013): 91–98. http://dx.doi.org/10.1590/s0044-59672013000100011.
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The present paper is a pioneering study on the Brachyura bycatch associated with the artisan prawn fisheries at the mouth of the Amazon River. The study was conducted at four collection sites distributed along the mouth of the Amazon River between the months of January/2009 and January/2010. The animals were caught using handcrafted traps called "matapi", which are used by prawn fisherman in the region. Twenty matapis were used at each collection site. A total of 145 specimens were captured and six species were identified, all belonging to the Trichodactylidae family - Sylviocarcinus maldonadoensis, S. pictus, S. devillei, Valdivia serrata, Dilocarcinus septemdentatus and D. pagei. The most representative species, S. maldonadoensis, S. pictus and S. devillei were classified as regular. Regarding the composition of the capture, there were three specimens of D. pagei , only one male specimen of D. septemdentatus, forty-eight specimens of S. maldonadoensis, sixty-eight specimens of S. pictus, twenty-two specimens of S. devillei and three specimens of V. serrata. In all months, the brachyuran fauna showed a considerably lower biomass when compared to the prawns, representing only 5% of the catch, in a ratio of 1:0.06. For most species, the number of males was always higher than the number of females in almost all collection months.
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Wiguno, T. A. A., i N. N. Dewi. "Evaluation of hatching rate and survival rate of giant freshwater prawn (Macrobrachium rosenbergii) in Installation of Brackish Water Culture Mayangan, Probolinggo, East Java, Indonesia". IOP Conference Series: Earth and Environmental Science 1036, nr 1 (1.07.2022): 012101. http://dx.doi.org/10.1088/1755-1315/1036/1/012101.
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Abstract Giant freshwater prawn (Macrobrachium rosenbergii) is a fisheries commodity that has a high economical value. The purpose of this study is to determine hatching rate and survival rate of giant freshwater prawn in Installation of Brackish Water Culture Mayangan. This research was carried out at Installation of Brackish Water Culture Mayangan from December 2018 until January 2019. The work method used in this research is descriptive method. The giant freshwater prawn hatchery technique is carried out using a natural spawning system. Newly hatched larvae still have egg yolk as food reserves which will run out in 3 days. After that, the larvae will be fed with natural feed, namely Artemia sp. The results showed that the hatching rate and survival rate of giant freshwater prawn were 54.7% and 40.6%, respectively. Water quality parameters of giant freshwater prawn larvae for pH, temperature, dissolved oxygen were 7-8.7, 27-28°C, and 7-8 mg/l, respectively. Ammonia, nitrite, and nitrate for this study were 0.14-0.32 mg/l, 0.006-0.007 mg/l, and 0.2-0.4 mg/l.
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Ives, M. C., J. P. Scandol, S. S. Montgomery i I. M. Suthers. "Modelling the possible effects of climate change on an Australian multi-fleet prawn fishery". Marine and Freshwater Research 60, nr 12 (2009): 1211. http://dx.doi.org/10.1071/mf07110.
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The relationship between fisheries and climate has been given renewed emphasis owing to increasing concern regarding anthropogenically induced climate change. This relationship is particularly important for estuarine fisheries, where there are documented correlations between river discharge and productivity. The commercial catch of school prawns (Metapenaeus macleayi) has been shown to be positively correlated with the rates of river discharge in northern New South Wales, Australia. In the present study, a simulation model was developed to analyse the dynamics of the stock for 10 years under alternative river discharge scenarios, and the effectiveness of a series of management strategies under these scenarios was examined. A size-based metapopulation model was developed that incorporated the dynamics of school prawn populations in three habitats being harvested by three different fishing methods. The model indicated that both the growth and movement of prawns were affected by the rates of river discharge, and that higher rates of river discharge usually generated increased commercial catches, but this outcome was not certain. It was concluded that the population does not appear to be overexploited and that none of the three alternative management strategies performed better within the model than the current spatio-temporal closures, even under a wide range of river discharge scenarios.
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Liggins, GW, SJ Kennelly i MK Broadhurst. "Observer-based survey of by-catch from prawn trawling in Botany Bay and Port Jackson, New South Wales". Marine and Freshwater Research 47, nr 7 (1996): 877. http://dx.doi.org/10.1071/mf9960877.
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Catches and by-catches were surveyed in the commercial prawn trawl fleets of Botany Bay and Port Jackson, two estuaries in the Sydney metropolitan area (NSW, Australia). Catches were surveyed in all tows during replicate fishing trips in each month during the 1990-91 and 1991-92 prawn trawl seasons in each estuary. Significant species-specific variabilities in abundances were detected between estuaries, between years, and between early and late in the fishing season. The mean annual ratio of by-catch to catch of prawns (by weight) was 2.5 : 1 for Botany Bay and 1.8 : 1 for Port Jackson. A mean annual by-catch (� 1 s.e.) of 142 � 14 t was taken from the Botany Bay fishery and 38 � 3 t from Port Jackson. These by-catches included large numbers of small recreationally and commercially important finfish: a mean annual by-catch of 1.52 �0.20 million fish from Botany Bay and 219� 23 thousand fish from Port Jackson. Despite uncertainties about the impacts of such by-catches on interacting commercial and recreational fisheries, it is recommended that strategies for the reduction of such by-catches be considered.
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Halliday, IA. "Influence of natural fluctuations in seagrass cover on commercial prawn nursery grounds in a subtropical estuary". Marine and Freshwater Research 46, nr 8 (1995): 1121. http://dx.doi.org/10.1071/mf9951121.
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Juvenile prawns were captured with a beam trawl from two intertidal seagrass sites (one sparsely and one densely vegetated) in Tin Can Bay, a subtropical estuary in south-eastern Queensland. The abundance and recruitment patterns of two commercial prawn species (Penaeus plebejus and Metapenaeus bennettae) were investigated. P. plebejus was the dominant species at both the sparse and dense seagrass sites. Die-back of the above-ground vegetation in the sparsely vegetated site coincided with a significant increase in the abundance of both P. plebejus and M. bennettae at this site. Natural loss of intertidal vegetation may cause an immediate reduction in the total fisheries value of an area because of fewer herbivorous commercial fish entering the area. In the longer term, this reduction in the fisheries value of the area may be compensated by an increase in value as a nursery ground for juvenile P. plebejus, thereby providing the potential for higher adult P. plebejus recruitment to local commercial fisheries and maintaining the overall value of the area.
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Prasad, Suday, Paras Nath i D. N. Chaudhary. "Freshwater Prawns Diversity (Crustacea: Decapoda) in the River Koshi, Eastern Bihar". Asian Journal of Research in Zoology 6, nr 2 (20.03.2023): 11–18. http://dx.doi.org/10.9734/ajriz/2023/v6i2107.
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Introduction: The river Koshi is one of the major tributary of river Ganga, which originated from the northern slopes of the Himalayas and flows southwards through north Bihar with draining of the Ganga basin near Kursela, in District Katihar, eastern Bihar.
Objectives: Diversity and abundance of freshwater prawns were studied from January 2020 to December 2022 in the Koshi river of district Katihar eastern Bihar, India.
Methodology: The prawn was collected from the bank of Koshi river with the support of fishermen at Kursela in Katihar district, eastern Bihar and preserved in 5% formalin for further study.
Results: Koshi river is also known as Saptakoshi for its seven upper tributaries, that transports a large amount of nutrient and perhaps encourages species prosperity both culturally and individually. The efficiency of water is significant and therefore the freshwater prawns are divers. Prawn is a very important foodstuff in developing countries, due to high protein content and its other nutrition values. In present study we identified & reports commercially and physically important total four species of prawn belonging to Macrobrachium genius in the river Koshi around Kursela, in Katihar district eastern Bihar. They are namely Macrobrachium gangeticum, M. gandaki, M. tiwari and M. lamarrei. The composition of prawn species among which M. lamarrei and M. tiwari were dominant species throughout the year. Whereas the catch of M. gangeticum and M. gandaki were restricted during June to September.
Conclusion: The current investigation important to the presence of commercially important and environmentally sustainable inhabitants available in the river Koshi, Kursela Katihar, eastern Bihar. The suggests to needs appropriate management and conservation strategies to prevent the further loss of populations from this site. The details of data collected are in the flesh in this communication.
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Watson, RA, CT Turnbull i KJ Derbyshire. "Identifying tropical penaeid recruitment patterns". Marine and Freshwater Research 47, nr 1 (1996): 77. http://dx.doi.org/10.1071/mf9960077.
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Knowledge of recruitment patterns is a requisite for modern fisheries management. These patterns can range in complexity from a single pulse of identically sized and aged prawns, which is often assumed in fisheries models, to continuous recruitment by prawns of several ages. Existing techniques used to identify recruitment patterns range from the ad hoc use of size limits to more complex methods that examine changes in length-frequency modes through time. A model that allowed variable growth of individuals was used to simulate monthly length-frequency fisheries data from a range of recruitment patterns of varying complexity. The effectiveness of a range of methods to identify these underlying recruitment patterns was examined. Length-frequency survey data from tropical penaeid fisheries for Penaeus esculentus, the brown tiger prawn, in two locations off north-eastem Australia (Torres Strait and Turtle Island Group) were also subjected to these methods. Methods that employed simple truncation by length successfully identified simple recruitment patterns but were not effective for multi-age recruitment patterns. Only the length-cohort and age-cohort methods could identify the presence of older recruits in multi-age patterns. All methods were sensitive to estimates of growth parameters, particularly the cohort-based methods. Results suggest that P. esculentus from the two fisheries examined had different recruitment patterns requiring different management approaches.
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Mkare, Thomas K., Sophie von der Heyden, Johan C. Groeneveld i Conrad A. Matthee. "Genetic population structure and recruitment patterns of three sympatric shallow-water penaeid prawns in Ungwana Bay, Kenya, with implication for fisheries management". Marine and Freshwater Research 65, nr 3 (2014): 255. http://dx.doi.org/10.1071/mf13047.
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Penaeid prawns in Ungwana Bay, Kenya, are heavily exploited by artisanal fishers and industrial bottom trawlers. Human activities in mangrove and estuarine areas may affect prawn nursery habitats and influence juvenile recruitment to fished areas, therefore it was important to investigate recruitment patterns in the bay. To test the hypotheses that single genetic stocks exist, we utilised a combination of mtDNA sequence and microsatellite data. Three dominant sympatric species, Penaeus monodon, Fenneropenaeus indicus and Metapenaeus monoceros were targeted. Sample sites were chosen to represent the bulk of fishery activities, and included estuarine juveniles and offshore adults. An exceptionally high mtDNA haplotype diversity, coupled with low nucleotide diversity was observed for all three species and there was no genetic differentiation among sampling sites. Genetic panmixia was confirmed by the microsatellite analyses of P. monodon. Juveniles that recruit to adult populations in Ungwana Bay most likely originate from local estuaries, and conservation of the prawn nursery habitats along the edges of the bay is advocated. Each of the three species represents a single management unit, and the identification of spatial management strategies to mitigate resource-user conflicts should rather consider other ecological and socio-economic factors than the genetic delineation of stocks.
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Owens, L. "Prevalence of Cabirops orbionei (Epicaridea; Cryptoniscidae) in northern Australia: A biocontrol agent for bopyrids". Marine and Freshwater Research 44, nr 3 (1993): 381. http://dx.doi.org/10.1071/mf9930381.
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In the Gulf of Carpentaria, bopyrids cause a loss of production to prawn fisheries due to sterilization. On the east coast of Queensland, the cabiropsid hyperparasite Cabirops orbionei sterilizes bopyrids. The hyperparasite was examined as a possible biocontrol agent for bopyrids. An ANOVA linear model using main effects only, was fitted to the data and accounted for 41% of the variability in the intensity of infection. Month, bopyrid reproductive status, prawn species, area of sampling, bopyrid species and prawn size accounted, respectively, for 10, 10, 7, 6, 5 and 3% of the explained variability. Prevalence of C. orbionei dropped from a maximum of 50% in February to a minimum of 10% in August before starting to rise again. Hyperparasitized bopyrids were usually fully sterilized by the cabiropsid. The most commonly hyperparasitized prawn was Penaeus esculentus, followed by Penaeus sernisulcatus, Penaeus longistylus and Penaeus latisulcatus; Metapenaeus endeavouri was not infected at all. Prevalence was almost uniform from Torres Strait to Halifax Bay but dropped precipitously at Cape Upstart. Epipenaeon ingens was 4-5 times more heavily infected than other bopyrid species. Prevalence of C. Orbionei rose to a maximum at 34-36 mm carapace length of prawn and dropped slowly thereafter.
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O'Neill, Michael F., George M. Leigh, You-Gan Wang, J. Matías Braccini i Matthew C. Ives. "Linking spatial stock dynamics and economics: evaluation of indicators and fishery management for the travelling eastern king prawn (Melicertus plebejus)". ICES Journal of Marine Science 71, nr 7 (3.02.2014): 1818–34. http://dx.doi.org/10.1093/icesjms/fst218.
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Abstract Reduced economic circumstances have moved management goals towards higher profit, rather than maximum sustainable yields in several Australian fisheries. The eastern king prawn is one such fishery, for which we have developed new methodology for stock dynamics, calculation of model-based and data-based reference points and management strategy evaluation. The fishery is notable for the northward movement of prawns in eastern Australian waters, from the State jurisdiction of New South Wales to that of Queensland, as they grow to spawning size, so that vessels fishing in the northern deeper waters harvest more large prawns. Bioeconomic fishing data were standardized for calibrating a length-structured spatial operating model. Model simulations identified that reduced boat numbers and fishing effort could improve profitability while retaining viable fishing in each jurisdiction. Simulations also identified catch rate levels that were effective for monitoring in simple within-year effort-control rules. However, favourable performance of catch rate indicators was achieved only when a meaningful upper limit was placed on total allowed fishing effort. The methods and findings will allow improved measures for monitoring fisheries and inform decision makers on the uncertainty and assumptions affecting economic indicators.
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Luneto, Riska, i Kaslam. "COMPETITIVE ADVANTAGE UDANG WINDU PINRANG DALAM PERDAGANGAN INTERNASIONAL". Review of International Relations 4, nr 1 (29.06.2022): 1–20. http://dx.doi.org/10.24252/rir.v4i1.28459.
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Indonesia is one of the countries that has potential for fisheries and marine resources, this of course has a positive value for state revenue. One of the commodities that play an important role is tiger prawns which are spread in almost all parts of Indonesia, Pinrang Regency is one of them. Responding to global demand that continues to increase, efforts are made by stakeholders to meet demand, cooperation, renewal and renewable technology are structured as a form of increasing production levels and productivity. This study uses the diamond model concept, Michael Porter in looking at the competitive advantage of Indonesian tiger prawn commodities, the author tries to map the value of competitiveness and superiority of Indonesian tiger shrimp products, especially tiger shrimp in Pinrang Regency.
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Taylor, Matthew D., Michael B. Lowry i Alistair Becker. "Evaluating potential competitive interactions following stocking through trophic niche breadth". Marine and Freshwater Research 69, nr 10 (2018): 1614. http://dx.doi.org/10.1071/mf17329.
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Responsible fisheries enhancement should include comprehensive monitoring programs to detect ecological effects of fish releases and support adaptive management. Competition for food and shelter is one such impact, and density-dependent effects may occur if release numbers are above levels that the ecosystem can support. Herein we present a novel application of trophic niche breadth estimated from stable isotope data to examine potential competitive interactions arising from eastern king prawn (Melicertus plebejus) stocking. Eastern king prawn and potential competitors (Macrobrachium intermedium, Atherinosoma microstoma, Leptatherina presbyteroides, Ambassis jacksoniensis and Gobiopterus semivestitus) were sampled from two stocked and two reference estuaries, before and after stocking. Stable isotope ratios were measured and used to model trophic overlap and trophic niche breadth. A statistically significant increase in niche breadth was evident for two competing species in one stocked estuary, and one competing species in another. M. intermedium, the species that had the greatest trophic overlap with eastern king prawn, did not show any change in niche breadth. The potential for competition and the role of environmental variability (including rainfall and run-off, mouth opening regime and seasonal changes) in driving the patterns observed are discussed. This approach shows promise for monitoring competitive effects arising from aquaculture-based fisheries enhancements in the future.
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Tirtadanu, Tirtadanu, i Umi Chodrijah. "BIOLOGICAL CHARACTERISTICS, POPULATION PARAMETERS, EXPLOITATION STATUS AND SPAWNING POTENTIAL RATIO OF GIANT TIGER PRAWN (PENAEUS MONODON FABRICIUS, 1798) IN SEBATIK WATERS, KALIMANTAN UTARA". Jurnal Penelitian Perikanan Indonesia 25, nr 3 (15.09.2019): 191. http://dx.doi.org/10.15578/jppi.25.3.2019.191-202.
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The limited data and the unreported information about the yields of giant tiger prawn (Penaeus monodon Fabricius, 1798) in Sebatik caused difficulties in estimating potention and stock status of tiger prawn. The study that could be applied for estimating stock status and management strategy for sustainable shrimp fisheries in Sebatik Waters was the study about biological characteristics, population parameters and spawning potential ratio. Samples were obtained from the catch of trammel net by fishers in some landing areas in Tanjung Aru and the biometric data has been collected during April-December 2018. The growth parameters were obtained from the movement of the monthly mode of carapace length that were based on the Von Bertalanffy growth model. Exploitation status was obtained from exploitation rate of E and length based SPR. The results showed that the mean size of shrimps that was captured by trammel net was 46,9±0,14 mmCL for male and 53,4±0,25 mmCL for female. Most of shrimps were caught before they spawn (Lc=51,2 mmCL<Lm=55,8 mmCL) and tiger prawns spawn throughout the year that the peaks occurred in Agustus dan November-December. Female shrimp has larger size (L∞ jantan=66,25 mmCL; L∞ betina=84,5 mmCL) and faster growth rate( K male=1,27 year-1; K female=1,39 year-1) than the male. The natural mortality of male shrimp was the same as the female (M=1,7 tahun-1) while the fishing mortality of male was higher than female (F male=2,13 tahun-1; F female=1,7 tahun-1). Exploitation status of tiger prawn in Sebatik Waters was fully exploited (E=0,5-0,55) and the shrimp stock has not been on growth overfishing yet according to spawning potential ratio of 34%. The shrimps fishing in Sebatik Waters could continue by avoiding the fishing on the nursery ground.
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Sutarjo, Ganjar Adhywirawan. "EFFECTIVENESS OF COMBINATION OF FEED FORM CAKE AND FEED NATURAL SILK WORMS (TUBIFEX SP) ON FEED CONVERSION RATIO (FCR), SPECIFIC GROWTH RATE AND GIANT FRESHWATER PRAWN SURVIVAL (MACROBACIUM ROSENBERGII) LARVAL STAGE". Indonesian Journal of Tropical Aquatic 1, nr 1 (4.08.2018): 23. http://dx.doi.org/10.22219/ijota.v1i1.5938.
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This study aimed to determine the effectiveness of the combination of cake feed and silk worm feed on feed coneration ratio (FCR), Survival, and specific growth rate (SGR) of prawn larvae (Macrobacium rosenbergii). The research was conducted on 8 February - 9 March 2018 at the Fisheries Laboratory of University of Muhammadiyah Malang. Shrimp used in this study is larval prawns stadia larvae. This research was conducted by experimental method using randomized block design (RAL) with 5 treatments and 4 replications. P1 100% silk worm and 0% cake feed, P2 25% silk worm and 75% cake form feed, P3 50% silk worm and 50% cake form feed, P4 75% silk worm and 25% cake feed, P5 100 % feed cake form. Feed is given in ad-station for 40 days. Observed data include Feed coneration ratio (FCR), Survival, specific growth rate (SGR), and water quality. The results showed that the combination of cake feed and silk worm feed had a significant effect on the growth rate of Specific (SGR) Fcount 7.58> from F. Table 5% (3.06) 1% (4.89), While no effect For Figures F count 0.90 <of F. Table 5% (3.06) 1% (4.89) and Feed Converation Ratio as F count 2.23 <of F. Table 5% (3.06) 1 % (4.89). Water quality on maintenance media against a reasonable range for shrimp cultivation. Keywords: fish cake, silk worm, giant freshwater prawn, growth
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Prince, Jeremy D., Neil R. Loneragan i Thomas A. Okey. "Contraction of the banana prawn (Penaeus merguiensis) fishery of Albatross Bay in the Gulf of Carpentaria, Australia". Marine and Freshwater Research 59, nr 5 (2008): 383. http://dx.doi.org/10.1071/mf07083.
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When the biomass and area occupied by a stock decline together, catch rates can remain high (hyperstability) and management with effort controls may be ineffectual. Banana prawn (Penaeus merguiensis) catches declined from 2000 until 2005 in the Albatross Bay area in the Gulf of Carpentaria (GOC), Australia. Data from commercial logbooks were used to investigate historical changes in the banana prawn fishery in this and other regions of the Northern Prawn Fishery to infer the potential causes of this decline. Data since 1970 were analysed using: (1) the mapping of catch and effort; and (2) normalised rank order catch curves, to determine the distribution of catches across fishing areas. These analyses show that there has been a marked contraction of the Albatross Bay fishery over 33 years of fishing into the centre of a stable ‘hotspot’, suggesting a potential mechanism for the observed negative relationship between catchability and biomass. We believe this is the first observation of a Peneaus prawn fishing ground contracting as biomass declines, supporting the view that the contraction of an area occupied by a stock as biomass declines, is a generalised phenomena observed widely across fisheries resources and not a dynamic confined to certain finfish and molluscs.
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Gray, Charles A. "Spatial variation in by-catch from a prawn seine-net fishery in a south-east Australian coastal lagoon". Marine and Freshwater Research 52, nr 7 (2001): 987. http://dx.doi.org/10.1071/mf00121.
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Observer-based estimates of the catches and by-catches from prawn seining (locally termed ‘snigging’) in Tuggerah Lake (NSW, Australia) during the 1998/99 fishing season are presented. Observed catches included three species of penaeid prawns, while observed by-catches contained a total of 49 finfish and 5 invertebrate taxa. The overall by-catch:prawn catch ratio by weight was 0.9:1, and in catching an estimated 20 ± 4 t of prawns the fleet took an estimated total by-catch of ± 2 t throughout the 6-month fishing season. The by-catch included large numbers of small (<15 cm total length) finfish species important in other commercial and recreational fisheries, including Gerres subfasciatus,Rhabdosargus sarba and Acanthopagrus australis, as well as several small demersal species of little economic value. Multivariate analyses indicated that by-catch composition differed between seines taken over shallow seagrass and bare substrata, with catch rates of several species being greater over seagrass. It is recommended that strategies to reduce potential ecological impacts and by-catch in this fishery be investigated, including fixed spatial closures over seagrasses and the development of alternative fishing gears and practices.
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Suman, Ali, i Budi Iskandar Prisantoso. "KARAKTERISTIK POPULASI UDANG JERBUNG (Penaeus merguiensis de Man, 1888) DI PERAIRAN CILACAP DAN SEKITARNYA". Jurnal Penelitian Perikanan Indonesia 23, nr 1 (26.05.2017): 11. http://dx.doi.org/10.15578/jppi.23.1.2017.11-18.
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Tingginya permintaan pasar terhadap udang jerbung mengakibatkan aktivitas penangkapannya berlangsung secara terus-menerus sepanjang tahun sehingga mengancam kelestariannya. Penelitian karakteristik populasi merupakan salah satu dasar utama dalam merumuskan pengelolaan menuju pemanfaatannya secara lestari. Tujuan penelitian ini adalah untuk mengetahui karakteristik populasi udang jerbung di perairan Cilacap dan sekitarnya. Penelitian dilakukan dari bulan Januari sampai dengan Nopember 2013 dengan metode survey. Hasil penelitian menunjukkan bahwa rata-rata ukuran panjang pertama kali matang kelamin (Lm) udang jerbung di perairan Cilacap dan sekitarnya adalah pada panjang karapas 38,3 mm dan musim pemijahan berlangsung sepanjang tahun dengan puncaknya pada bulan Januari. Laju pertumbuhan udang jerbung jantan adalah 1,00 per tahun dan panjang karapas maksimum (L ) adalah 40,7 mm serta untuk udang betina didapatkan nilai K adalah 1,10 per tahun dan nilai Loo adalah 54,2 mm. Laju kematian total (Z) udang jerbung jantan adalah 2,46 per tahun, laju kematian karena penangkapan (F) dan laju kematian alami (M) masing-masing 1,37 per tahun dan 1,09 per tahun. Untuk udang betina didapatkan nilai Z adalah 1,69 per tahun, nilai F dan nilai M masing-masing 0,61 dan 1,08 per tahun. Laju pengusahaan (E) udang jerbung jantan adalah 0,56 per tahun dan nilai E udang betina adalah 0,36 per tahun. Pola penambahan baru udang jerbung di perairan Cilacap berlansung sepanjang tahun dengan puncaknya pada bulan Maret dan April. Tingkat pemanfaatan udang jerbung jantan sudah berada dalam tahapan overfishing dan perlu dilakukan pengurangan jumlah upaya.High market demand of banana prawn have consequence in fishingactivities which is carried out continuously throughout the year, so that could be threaten of resources sustainability. Scientific advices on the population characteristic are required as an input to support fisheries management. The purpose of the study was to identify population characteristic of the banana prawn with survey method. Study on the population characteristic of banana prawn (P. merguiensis de Man) was conducted in Cilacap and the surrounding waters based on data collected during, January 2013 to November 2013. Result showed that the size at first maturity (Lm) of banana prawn was 38.3 mm in carapace length. The spawning season of banana prawn in Cilacap and the surrounding waters occures throughout the year with the peak in January. The growth parameters of male (K) was 1.0/year with maximum carapace length (L ) of 40.7 mm and K for female was 1.10/year with maximum carapace length of 54,2 mm. Instantaneous total mortality rate (Z) and natural mortality rate (M) of male were 2.46/year and 1.09/year, respectively. While fishing mortality (F) and exploitation rate (E) respectively were 1.37/year and 0.56/year. The total mortality (Z) and natural mortality (M) of female respectively were 1.69/year and 1.08/year. Fishing mortality (F) and exploitation rate (E) were 0.61/ year and 0.36/year. The recruitment pattern of banana prawn in Cilacap and surrounding waters occures throughout the year with two peaks in March and April. The exploitation rate of male of banana prawn fisheries in Cilacap waters was high. It was, therefore, recommended that fishing effort of the banana prawn in that waters should be reduced in the next year.
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Fajri, Fajar, Azwar Thaib i Lia Handayani. "Penambahan mineral kalsium dari cangkang kepiting bakau (Scylla serrata) pada pakan terhadap pertumbuhan dan kelangsungan hidup udang galah (Macrobrachium rosenbergii)". Depik 8, nr 3 (13.09.2019): 185–92. http://dx.doi.org/10.13170/depik.8.3.12090.
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Abstract. Mud crab shell is one of the most fisheries waste can be utilized as calcium source because it contains lots of calcium carbonat. Utilizing of crab shells flour in fed is important applied as calcium supplements to freshwater prawn. The purpose of this research is to knows the effects of calcium addition from mud crab shells on fed to increase the growth rate, survival rate and moulting frequency freshwater prawn. The research has been done during 70 days in fisheris Laboratory, Abulyatama University. Result of the research shows that two percents calcium addition on fed give higher growth rate value, survival rate value and moulting frequency value than other treatments and were not added calcium on fed. The average of freshwater prawn growth rate are treatment A (0% CaO)= 1.20 g, B (1% CaO) = 1.41 g, C (2% CaO) = 1.92 g, D (3% CaO) = 1.77 g. The average of freshwater prawn survival rate result shown by treatment A = 75 %, B = 91,1 %, C = 91,1 %, and D = 89 %. The moulting frequency value results shown by treatment A = 1,06 ; B = 1,22; C = 1,57 and D = 1,34. Keywords : Calcium, Freshwater Prawn, Macrobranchium rosenbergii, Moulting Abstrak. Cangkang kepiting bakau merupakan salah satu limbah perikanan yang dapat dimanfaatkan sebagai sumber kalsium karena cangkang kepiting mengandung kalsium karbonat tinggi. Pemanfaatan tepung cangkang kepiting pada pakan adalah sebagai suplemen. Tujuan dari penelitian ini untuk mengetahui pengaruh penambahan mineral kalsium dari cangkang kepiting bakau pada pakan untuk meningkatkan laju pertumbuhan, kelangsungan hidup dan frekuensi molting udang galah. Penelitian ini dilakukan selama 70 hari di laboratorium perikanan, Universitas Abulyatama. Hasil dari penelitian menunjukkan bahwa penambahan 2 % kalsium pada pakan memberikan hasil tertinggi untuk laju pertumbuhan, kelangsungan hiidup dan frekuensi molting udang galah dibanding perlakuan lain. Nilai rata-rata pertumbuhan udang galah tiap perlakuan adalah sebagai A (0% CaO) = 1,20 gr, B (1% CaO) = 1.41 gr, C (2% CaO) = 1.92 gr dan D (3% CaO) = 1,77 gr. Sedangkang nilai rata-rata kelangsungan hidup udang galah adalah A = 75 %, B = 91,1 %, C =91,1 % dan D = 89 %. Nilai ata-rata frekuensi molting udang galah selama pemeliharaan pada tiap perlakuan adalah A = 1,06 kali/ekor, B = 1,22 kali/ekor, C = 1,57 kali/ekor dan D = 1,34 kali/ekor. Kata kunci: Kalsium, Macrobranchium rosenbergii, Moulting, Udang Galah
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Suman, Ali, Budi Iskandar Prisantoso i Duranta D. Kembaren. "PARAMETER POPULASI UDANG DOGOL (Metapenaeus ensis) DAN UDANG WINDU (Penaeus monodon) DI LAUT ARAFURA". BAWAL Widya Riset Perikanan Tangkap 9, nr 1 (15.08.2017): 57. http://dx.doi.org/10.15578/bawal.9.1.2017.57-62.
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Sumber daya udang di perairan Arafura merupakan salah satu modal menuju kemakmuran bagi bangsa, apabila dikelola secara berkelanjutan. Kajian dinamika populasi udang, merupakan salah satu dasar utama dalam merumuskan pengelolaan tersebut menuju pemanfaatan sumber daya yang lestari. Tujuan penelitian ini adalah untuk mengetahui dinamika populasi udang dogol dan udang windu di perairan Arafura dan sekitarnya. Penelitian dilakukan dari bulan Januari 2013 sampai dengan Nopember 2013 dan analisis dilakukan dengan menggunakan FAO-ICLARM Fisheris Stok Assessment Tools (FISAT). Hasil penelitian menunjukkan bahwa laju pertumbuhan (K) udang dogol sebagai 1,33 per tahun dan panjang karapas maksimum (L) sebagai 52,0 mm. Untuk udang windu didapatkan nilai K sebagai 1,45 per tahun dan nilai L sebagai 62,5 mm. Laju kematian total (Z) udang dogol sebagai 4,79 per tahun, laju kematian karena penangkapan (F) dan laju kematian alami (M) masing-masing 2,91 per tahun dan 1,88 per tahun. Untuk udang windu didapatkan nilai Z sebagai 6,13 per tahun, nilai F dan nilai M masing-masing 4,24 dan 1,89 per tahun. Laju pengusahaan (E) udang dogol 0,61 per tahun dan nilai E udang windu sebagai 0,69 per tahun. Tingkat pemanfaatan sudah berada dalam tahapan overfishing dan perlu dilakukan pengurangan jumlah upaya 22% untuk udang dogol dan 38% untuk udang windu.Shrimp resources within Arafura Sea if under sustainably management it would contribute a significant role as a source of nation welfare. Scientific advice on population dynamic are required as an input to support an apropriate fisheries management. The purpose of the study was to identify population parameters of the endeavour shrimp and tiger shrimp in Arafura Sea. Study on the population dynamic of endeavour shrimp and king tiger prawn were conducted in Arafura Sea based on data collected during period of survey, January 2013 to November 2013. The analysis is using the FAO-ICLAM Fisheries Stock Assessment Tools (FiSAT). Result showed that the growth parameter of endeavour shrimp was 1.33/year with maximum carapace length (L) of 52.0 mm. Instantenous total mortality (Z) and natural mortality (M) were 4.79/year and 1.88/year, respectively. While fishing mortality (F) and exploitation rate (E) of endeavour shrimp respectively were 2.91/year and 0.61/year. The growth parameter of king tiger prawn was 1.45/year with maximum carapace length (L) of 62.5 mm. Instantenous total mortality (Z) and natural mortality (M) were 6.13/year and 1.89/year, respectively. While fishing mortality (F) and exploitation rate (E) of king tiger prawn respectively were 4.24/year and 0.69/year. The exploitation rate of endeavour shrimp and king tiger prawn in Arafura Sea was overfishing. It was, therefore, recommended that fishing effort of 22% the endeavour shrimp and 38% king tiger prawn in that waters should be reduced in the next year.
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Hasan, MN, MS Rahman, MF Hosen i MA Bashar. "Effects of addition of tilapia on the abundance of periphyton in freshwater prawn culture ponds with periphyton substrates". Journal of the Bangladesh Agricultural University 10, nr 2 (13.05.2013): 313–24. http://dx.doi.org/10.3329/jbau.v10i2.14924.
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An experiment was conducted to evaluate the effect of addition of tilapia on abundance of periphyton in freshwater prawn, Macrobrachium rosenbergii (de Man) in periphyton based culture system for a period of 120 days at Fisheries Field Laboratory Complex, Bangladesh Agricultural University, Mymensingh. A large pond (83×8.9 m) was drained completely and partitioned by galvanized iron sheet into 18 small ponds of 40 m2 each; of which 6 ponds were used for this experiment. The experimental ponds were divided into 2 treatments each with 3 randomly selected ponds. The absence and presence (0 and 0.5 individual m-2) of tilapia (Oreochromis niloticus) were investigated in 40 m2 ponds stocked with 3 prawn juveniles (5±0.05 g) m-2 with added substrates for periphyton development. A locally formulated and prepared feed containing 30% protein was supplied considering the body weight of prawn only. Addition of periphyton substrates significantly reduced the inorganic N-compounds (TAN, NO2-N, and NO3-N) in water column. Forty six genera of periphyton were identified belonging to the Bacillariophyceae (10), Chlorophyceae (21), Cyanophyceae (7), Euglenophyceae (2), Crustacea (1) and Rotifera (5) with significant difference (P<0.05) of phyto-periphyton except Euglenophyceae and without significant difference (P>0.05) of zoo-periphyton between the treatments. The abundance of periphyton biomass in terms of dry matter, ash, ash free dry matter and chlorophyll-a were significantly higher in tilapia-free ponds comparing to tilapia added ponds. Benthic organisms had no significant difference (p>0.05) between the treatments. Addition of tilapia in periphyton-based system benefited the freshwater prawn culture through (i) reducing toxic inorganic nitrogenous compounds in water (ii) reducing demand for supplemental feed (iii) using periphyton as additional natural feed and, (iv)improving survival and production of prawn and tilapia.DOI: http://dx.doi.org/10.3329/jbau.v10i2.14924 J. Bangladesh Agril. Univ. 10(2): 313-324, 2012
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Fondo, Esther N., Johnstone O. Omukoto, Nina Wambiji, Gladys M. Okemwa, Pascal Thoya, George W. Maina i Edward N. Kimani. "Diversity of Shallow-Water Species in Prawn Trawling: A Case Study of Malindi–Ungwana Bay, Kenya". Diversity 14, nr 3 (9.03.2022): 199. http://dx.doi.org/10.3390/d14030199.
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Bottom trawling is a common fishing method that targets bottom-dwelling fisheries resources. It is non-selective and large amounts of by-catch are discarded, raising serious sustainability and ecosystem conservation concerns. In this study, a shallow-water bottom-trawl fishery was evaluated using logbook catch data between 2011 and 2019 and the species composition data collected by fisheries observers between 2016 and 2019. The logbook data showed a twenty-fold increase in the annual catches with a ten-fold increase in fishing effort and an increase in the proportion of retained catch from 2011 to 2019. The observer data showed that for prawn, the by-catch ratio ranged from 1:3 to 1:9 during the four years. Multivariate analysis revealed significant differences between the compositions of retained and discarded catches mainly attributed to Pellona ditchela, Nematopalaemontenuipes, and Secutor insidiator. There was no significant decline in species diversity and the trophic level of the catches over the 4-year observer period indicating no marked impact of trawling on the stock at the current level of fishing effort. This study provides baseline information on the prawn trawl fishery against which the performance of the management regulations may be evaluated towards the Ecosystem Approach to Fisheries management.
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Lima, Jô de Farias, Luis Mauricio Abdon da Silva, Thibério Carvalho da Silva, Jamile da Silva Garcia, Ilana da Silva Pereira i Karlia Dalla Santa Amaral. "Reproductive aspects of Macrobrachium amazonicum (Decapoda: Palaemonidae) in the State of Amapá, Amazon River mouth". Acta Amazonica 44, nr 2 (czerwiec 2014): 245–54. http://dx.doi.org/10.1590/s0044-59672014000200010.
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Macrobrachium amazonicum is an indigenous prawn vastly distributed in basins of South America, widely exploited by artisanal fisheries in northern and northeastern Brazil and, with great potential for aquaculture. This study aimed to investigate general aspects of population structure and reproductive characteristics (size at first maturity, fecundity and reproductive output) of M. amazonicum from two important areas to artisanal prawn fishing located at the mouth of the Amazon River, State of Amapá. The specimens were captured using 20 handcrafted traps called "matapi". A number of 5,179 prawns were captured, 2,975 females and 2,195 males resulting in 1.35:1 female to male ratio. Santana Island and Mazagão Velho showed females predominated in the population. A reproductive peak period was observed from January to April/2009 and in December/2010, coinciding with the period of higher rainfall. The recruitment peak occurred in June and July/2009. Egg-bearing females ranged in size (carapace length) from 11.10 to 29.6 mm. Fecundity increased with female size and reached up to 7,417 eggs. This amount of eggs is considered low if compared with other Macrobrachium estuarine species. Mean egg volume increased gradually from 0.121 to 0.24 mm³ during embryogenesis, representing 68.5% of overall increase from Stage I to Stage III. Eggs of M. amazonicum are small; this is typical for Macrobrachium species, which depends on brackish water to complete the larval development. Irrespective of female size, reproductive output of M. amazonicum varied between 4.8 and 21.85% of their body weight into eggs production.
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Tirtadanu, Tirtadanu, Wedjatmiko Wedjatmiko i Pratiwi Lestari. "DINAMIKA POPULASI DAN TINGKAT PEMANFAATAN UDANG WINDU (Penaeus semisulcatus de Haan, 1844) DI PERAIRAN BALIKPAPAN". Jurnal Penelitian Perikanan Indonesia 23, nr 1 (26.05.2017): 37. http://dx.doi.org/10.15578/jppi.23.1.2017.37-46.
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Udang windu (Penaeus semisulcatus de Haan, 1844) di perairan Kalimantan Timur saat ini diduga berada dalam tahapan lebih tangkap, sehingga kajian dinamika populasi udang windu di perairan Balikpapan merupakan informasi yang penting untuk dilakukan.Penelitian ini bertujuan untuk mengkaji dinamika populasi dan tingkat pemanfaatan udang windu sebagai dasar dalam pengelolaan perikanan udang di Balikpapan.Penelitian ini dilakukan pada bulan Februari – November 2016.Metode yang digunakan adalah random sampling dengan analisis menggunakan model analitik. Hasil penelitian menunjukkan ukuran panjang karapas asimptotik (CL∞) udang jantan sebesar 47,5 mmCL dengan laju pertumbuhan (K) 1,72 per tahun dan panjang karapas asimptotik (CL∞) udang betina 53,7 mmCL dengan laju pertumbuhan (K) 1,53 per tahun. Ukuran rata-rata pertama kali tertangkap udang (Lc) sebesar 31,5 mmCL lebih kecil dibandingkan ukuran rata-rata pertama kali matang gonad (Lm) sebesar 39,63 mmCL, menunjukkan sebagian besar udang tertangkap sebelum memijah. Tingkat pemanfaatan udang windu berada pada tahap lebih tangkap (overfishing) dengan nilai laju pengusahaan (E) sebesar 0,65 pada jantan dan 0,77 pada betina, sehingga disarankan untuk melakukan pengurangan upaya penangkapan sebesar 42% dan pengaturan jaring dengan ukuran tertangkap lebih besar dari 39 mmCL.The green tiger prawn (Penaeus semisulcatus de Haan, 1844) in Kalimantan Timur were estimated in stages of overfishing, so dynamic population of green tiger prawn was important information needed to do. Aim of this research were to study about dynamic population and exploitation rate of green tiger prawn as basis management for shrimp fisheries in Balikpapan. This research conducted on February – November 2016. The method used was random sampling and the analysis used was analytical model. The results showed that carapace asymptotic length (CL∞) of male green tiger prawn was 47,5 mmCL and the growth rate was 1,72 year-1. Carapace asymptotic length (CL∞) of female prawn was 53,7 mmCL and the growth rate was 1,53 year-1. Length at first captured was 31,5 mmCL, smaller than length at first matured that was 39,63 mmCL so most of shrimps captured hadn’t spawned yet. Exploitation rate of the green tiger prawn was on stage of overfishing with the value of exploitation rate was 0,65 for male and 0,77 for female, so it was suggested to reduce fishing effort by 42% and mesh size regulation with the size allowable catch was bigger than 39 mmCL.
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Nasution, Siti Aminah, i 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, nr 2 (14.02.2022): 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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Mili, Sami, Rym Ennouri, Manel Fatnassi, Safa Bejaoui i Dalel Bejaoui. "Fisheries activity in the Bizerta lagoon (South Mediterranean Sea) from the 18th to the 21st century". Journal of Aquaculture & Marine Biology 12, nr 1 (2023): 43–47. http://dx.doi.org/10.15406/jamb.2023.12.00355.
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The Bizerte lagoon is characterized by its biological diversity and its wealth of species with high commercial values such as cuttlefish, seabass, seabream, mussels, prawn, and sole, and its fisheries provide employment for fishermen in the area. Indeed, artisanal fishing in the lagoon has been practiced for decades using traps, nets, and mobile gears such as straight nets and lines. The present paper focuses on the diagnosis of the fisheries’ status in this area. This allows us to reflect on the exploitation of the species caught in the Bizerte lagoon since the18th century. Large-scale hydraulic works taking place during the 20th century resulted in a reduction in the water volume inputs, inevitably affecting the fishing activity in the lagoon which we intend to analyze in the present work.
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Milton, David A., Gary C. Fry i Quinton Dell. "Reducing impacts of trawling on protected sea snakes: by-catch reduction devices improve escapement and survival". Marine and Freshwater Research 60, nr 8 (2009): 824. http://dx.doi.org/10.1071/mf08221.
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Sea snakes (Hydrophidae) are by-catch of prawn trawling throughout the tropical Indo-western Pacific. We tested the effectiveness of three by-catch reduction device (BRD) types set at different distances from the codend in Australia’s Northern Prawn Fishery (NPF). Trained crew-member observers compared the numbers of sea snakes caught in paired Control and Treatment nets in 1365 trawls. Catches of sea snakes were reduced by 43% on those vessels where a Fisheye BRD was positioned less than 70 meshes from the codend. A separate study with a scientific observer undertook trials with a ‘popeye’ Fishbox BRD. This BRD reduced sea snake catch by 85% and small fish by-catch by 48%. Catches of target prawn were similar for all nets in both studies (difference <2%). Adoption of the more effective BRDs (‘popeye’ Fishbox or Fisheye BRDs) by the NPF and locating them within 70 meshes of the codend can potentially reduce sea snake catch and thus their mortality from ~7000 in the 2007 fishing season to as few as 1500 snakes. Our study shows that the use of BRDs in tropical coastal demersal fisheries and positioning them closer to the codend will greatly reduce the catch of vulnerable sea snakes.
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Christian, Y., A. Afandy i Desmiwati. "Eight natural treasures of Aceh Jaya, Province of Aceh". IOP Conference Series: Earth and Environmental Science 967, nr 1 (1.01.2022): 012011. http://dx.doi.org/10.1088/1755-1315/967/1/012011.
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Abstract The coastal regency of Aceh Jaya has great potential resources in marine and fisheries, agriculture-plantation-animal farming, forestry, minerals-mining, tourism, processing industry, and renewable energy. However, significant challenges arise regarding selecting these potentials with the principle of sustainability: encouraging economic development, being accountable and socially accepted, and having an ecological perspective as a short to medium plan to accelerate economic growth. This study has identified the leading sectors with the most potential resources for the basis of development priority of Aceh Jaya nearly two decades after the 2004’s tsunami. The research was conducted in nine districts in Aceh Jaya Regency. Data is processed through Market Analysis, Gap Analysis, Stakeholder and Institutional Analysis, and Sectoral Analysis. These analyses identified eight sectors with each superior product for the development acceleration of Aceh Jaya. Those sectors and the products are agriculture (rice), capture fisheries (tuna, skipjack, mackerel tuna, and crustacean), aquaculture (giant-tiger prawn, tilapia, and lobster), animal farming (cattle, buffalo, goat, duck), forestry (agarwood, dragonblood, and rattan), tourism (Geureutee, Reusam Island), mineral (coal), industry (prawn cracker, shredded catfish, soybean, patchouli oil, and biogas).
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Zhou, Shijie, Andre E. Punt, Roy Deng, Marco Kienzle i Wayne Rochester. "Bayesian fishable biomass dynamics models incorporating fished area and relative fish density". Canadian Journal of Fisheries and Aquatic Sciences 68, nr 9 (wrzesień 2011): 1603–14. http://dx.doi.org/10.1139/f2011-083.
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Fisheries typically experience large changes over time in fishing effort. The size of the area fished may also change substantially over time, mimicking the trend in fishing effort, and may have major effects on the population dynamics and fishing process. We extend a biomass dynamics model to incorporate fished area and relative fish density in fished and unfished areas. The fishable population is defined as those individuals in the fished area and those that are sufficiently close to the fished area that they could potentially move into fished area during the fishing season. We estimate fishable biomass using three models assuming different level of population mixing between fished and unfished areas (i.e., partial mixing, full mixing, and no mixing). The models are implemented within a hierarchical Bayesian framework. Model performance is explored using simulations, and the approach is illustrated using logbook data for two tiger prawn species in Australia’s Northern Prawn Fishery. The partial mixing model that involves estimating a mixing parameter performs better than the models that assume no or full mixing. The methods could be applied to other fisheries where the area fished has changed substantially over the history of the fishery.
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Kienzle, Marco, i David J. Sterling. "Rising temperatures increased recruitment of brown tiger prawn (Penaeus esculentus) in Moreton Bay (Australia)". ICES Journal of Marine Science 74, nr 3 (6.12.2016): 741–49. http://dx.doi.org/10.1093/icesjms/fsw191.
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Abiotic factors are fundamental drivers of the dynamics of wild marine fish populations. Identifying and quantifying their influence on species targeted by the fishing industry is difficult and very important for managing fisheries in a changing climate. Using multiple regression, we investigated the influence of both temperature and rainfall on the variability of recruitment of a tropical species, the brown tiger prawn (Penaeus esculentus), in Moreton Bay which is located near the southern limit of its distribution on the east coast of Australia. A step-wise selection between 60 environmental variables identified temperature as the most important environmental factor to explain the variations of recruitment between 1990 and 2014. Including temperature into the Beverton and Holt stock–recruitment relationship explained 69% of the recruitment variability compared with 9.5% when omitted. This analysis indicates that increasing temperatures have increased recruitment of brown tiger prawn in Moreton Bay.
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Boltachev, A. R., S. V. Statkevich, E. P. Karpova i I. V. Khutorenko. "BLACK SEA GRASS PRAWN PALAEMON ADSPERSUS (DECAPODA, PALAEMONIDAE): BIOLOGY, FISHERIES AND PROBLEMS". Problems of fisheries 18, nr 3 (2017): 313–27. http://dx.doi.org/10.36038/0234-2774-2017-18-3-313-327.
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GREENVILLE, JARED, JESSICA HARTMANN i T. GORDON MACAULAY. "Technical Efficiency in Input-Controlled Fisheries: The NSW Ocean Prawn Trawl Fishery". Marine Resource Economics 21, nr 2 (styczeń 2006): 159–79. http://dx.doi.org/10.1086/mre.21.2.42629502.
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Nandi , N. C. "Aquaculturable fishery resources in wetlands of West Bengal". Journal of Aquaculture & Marine Biology 12, nr 1 (2023): 80–84. http://dx.doi.org/10.15406/jamb.2023.12.00359.
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The State of West Bengal supports a wide variety of wetlands covering freshwater, brackish water, and coastal wetlands, both natural and manmade wetlands. The Directorate of Fisheries, Government of West Bengal estimated at 3,111,92.52 ha which include river, canal, beel/ baor, and reservoir. A list of a total of 61 cultivated and culturable species occurring in freshwater and brackish water wetlands of West Bengal is provided. Another list of 21 crustacean fishery species occurring in coastal wetlands is added in this communication along with their local names, size, occurrence, and utilization from coastal areas of West Bengal. Export of a freshwater prawn species, Macrobrachium rosenbergi (De Man) and a brackish water prawn species, Penaeus monodon (Fabricius) are highlighted. It is suggested that relevant Government agencies, local administration, educational institutions, individual experts and NGOs need to act closely on various approaches and issues of mutual interest towards aquacultural development and better management of larger wetlands of West Bengal.
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Zhou, Shijie, André E. Punt, Roy Deng i Janet Bishop. "Estimating multifleet catchability coefficients and natural mortality from fishery catch and effort data: comparison of Bayesian state–space and observation error models". Canadian Journal of Fisheries and Aquatic Sciences 68, nr 7 (lipiec 2011): 1171–81. http://dx.doi.org/10.1139/f2011-052.
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Catchability and natural mortality are key quantities in fisheries stock assessment. However, it is difficult to estimate these two parameters simultaneously using only fishery catch and effort data. A Bayesian state–space modified delay–difference model is outlined that can estimate time series of catchability by fleet as well as natural mortality. This model, and three variants thereof, is fitted to data for grooved tiger prawns ( Penaeus semisulcatus ) in Australia’s Northern Prawn Fishery during the period of the year when there is little recruitment. A model that allows for both observation and process error and estimates natural mortality is best, in terms of model selection criteria as well as fit diagnostics. The posterior median estimate for catchability for the primary target fleet ranges from 6.15 × 10−4 to 1.09 × 10−4 during 1980–2007, while the posterior median estimate for catchability for a fleet with P. semisulcatus as its byproduct is about 20% of that for the primary fleet. Fishing efficiency increased at approximately 2% annually during 1980–2007, while the weekly natural mortality is estimated to be 0.053 week–1.