Academic literature on the topic 'Istiophorus platypterus'
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Journal articles on the topic "Istiophorus platypterus"
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Luthy, Stacy A., Joseph E. Serafy, Robert K. Cowen, Kelly L. Denit, and Su Sponaugle. "Age and growth of larval Atlantic sailfish, Istiophorus platypterus." Marine and Freshwater Research 56, no. 7 (2005): 1027. http://dx.doi.org/10.1071/mf05048.
Full textAbstract:
Of the Atlantic istiophorid billfishes, larval age–size relationships and growth rates have been examined only for blue marlin (Makaira nigricans). Using otolith microincrement analysis, we describe age–length and age–weight relationships for larval sailfish (Istiophorus platypterus) collected from the Straits of Florida. Sagittae and lapilli were dissected from 70 larvae ranging from 2.8 to 15.2 mm in (notochord or standard) length. Comparisons between otolith images obtained by light microscopy and scanning electron microscopy indicated that increment widths were well within the resolving power of light microscopy. Indirect evidence and published descriptions of larval blue marlin otoliths suggest daily increment deposition. Estimated ages of specimens ranged from 3 to 18 days. Length data were fitted to age estimates with an exponential model (R2 = 0.85). The estimated size-at-hatch for sailfish was 1.96 mm notochord length, and the daily instantaneous growth coefficient was 0.14. A power curve with exponent 3.05 described the length–dry weight relationship for sailfish. The instantaneous growth coefficient for an exponential regression of dry weight, converted from length, versus estimated age was 0.41. Growth in the length of sailfish larvae from the Straits of Florida was very similar to that described for blue marlin larvae from Exuma Sound, Bahamas.
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Hernández-Aguilar, Sandra Berenice. "Reproductive biology of the sailfish Istiophorus platypterus in the Acapulco Bay, Mexico." Hidrobiológica 30, no. 3 (December 31, 2020): 269–80. http://dx.doi.org/10.24275/uam/izt/dcbs/hidro/2020v30n3/hernandez.
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Hernández-Aguilar, Sandra Berenice. "Reproductive biology of the sailfish Istiophorus platypterus in the Acapulco Bay, Mexico." Hidrobiológica 30, no. 3 (December 31, 2020): 269–80. http://dx.doi.org/10.24275/uam/izt/dcbs/hidro/2021v30n3/hernandez.
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Del Moral-Flores, Luis Fernando, Eduardo López-Segovia, and Tao Hernández-Arellano. "Nuevos registros de peces para el área marina del Parque Nacional Sistema Arrecifal Veracruzano, suroeste del Golfo de México." Novitates Caribaea, no. 16 (July 23, 2020): 169–76. http://dx.doi.org/10.33800/nc.vi16.236.
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Presentamos cinco nuevos registros de peces para el área marina del Parque Nacional Sistema Arrecifal Veracruzano, con evidencia fotográfica y se proveen los datos morfométricos y merísticos básicos: el miraestrellas Gillellus greyae (70.3 mm, Longitud total), el góbido Oxyurichthys stigmalophius (36 mm, Longitud total), el cochito manchado Canthidermis maculata (342.4 mm, Longitud total) y el pez vela Istiophorus platypterus (?1,800 mm, Longitud total) se distribuyen ampliamente en el Caribe; además del primer registro en el Golfo de México del lenguado manchado Bothus maculiferus (250 mm, Longitud total).
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Walter, John F., Eric S. Orbesen, Christopher Liese, and Joseph E. Serafy. "Can Circle Hooks Improve Western Atlantic Sailfish, Istiophorus Platypterus, Populations?" Bulletin of Marine Science 88, no. 3 (July 1, 2012): 755–70. http://dx.doi.org/10.5343/bms.2011.1072.
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Vidaurri-S, Ana Luisa, Rene Macias-Zam, and Manuel Gallardo C. "Albinism in Sailfish (Istiophorus platypterus) Found in the Coast of Colima, Mexico." Pakistan Journal of Biological Sciences 8, no. 4 (March 15, 2005): 669–71. http://dx.doi.org/10.3923/pjbs.2005.669.671.
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Lu, Ching-Ping, Jaime R. Alvarado Bremer, Jessica L. McKenzie, and Wei-Chuan Chiang. "Analysis of sailfish (Istiophorus platypterus) population structure in the North Pacific Ocean." Fisheries Research 166 (June 2015): 33–38. http://dx.doi.org/10.1016/j.fishres.2014.09.018.
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Musyl, Michael K., Christopher D. Moyes, Richard W. Brill, Bruno L. Mourato, Andrew West, Lianne M. McNaughton, Wei-Chuan Chiang, and Chi-Lu Sun. "Postrelease mortality in istiophorid billfish." Canadian Journal of Fisheries and Aquatic Sciences 72, no. 4 (April 2015): 538–56. http://dx.doi.org/10.1139/cjfas-2014-0323.
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Meta-analysis (inverse-variance, random-effects model) involving 46 studies was used to estimate the effect size of postrelease mortality (Fr) in six istiophorid billfish species (black marlin (Istiompax indica), blue marlin (Makaira nigricans), longbill spearfish (Tetrapturus pfluegeri), sailfish (Istiophorus platypterus), striped marlin (Kajikia audax), and white marlin (Kajikia albida)) following release from recreational, longline, and harpoon fishing gears. The studies involved 400 reporting pop-up satellite archival tags and 64 reporting acoustic (ultrasonic) tags. Despite fish being captured, tagged, and released under widely disparate conditions, locations, and gear types, Fr was homogeneous among species. Variability in Fr was principally due to random sampling error within studies with no evident patterns. Fifteen studies (33% of tags) indicated no mortality, and the overall summary effect size for Fr was 13.5% (95% CI: 10.3%–17.6%). Since the random-effects model decomposed to a fixed-effect model when the between-studies variance T2 = 0.00, results were confirmed using exact nonparametric inferential tests and sensitivity analyses. Our results support earlier findings in the Atlantic and substantiate the majority of istiophorid billfish survive when released from recreational and longline fishing gear, clearly implying catch-and-release as a viable management option that permits fishing activity while protecting parental biomass and the fishery.
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Speare, P. "Parasites as biological tags for sailfish Istiophorus platypterus from east coast Australian waters." Marine Ecology Progress Series 118 (1995): 43–50. http://dx.doi.org/10.3354/meps118043.
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Richardson, David E., Joel K. Llopiz, Kevin D. Leaman, Peter S. Vertes, Frank E. Muller-Karger, and Robert K. Cowen. "Sailfish (Istiophorus platypterus) spawning and larval environment in a Florida Current frontal eddy." Progress in Oceanography 82, no. 4 (September 2009): 252–64. http://dx.doi.org/10.1016/j.pocean.2009.07.003.
Full textDissertations / Theses on the topic "Istiophorus platypterus"
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Bangma, Jessica. "Contemporary population structure and historical demography of sailfish (Istiophorus platypterus) in the Atlantic Ocean." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1876.
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McDowell, Jan Renee. "Genetic stock structure of the sailfish, Istiophorus platypterus, based on nuclear and mitochondrial DNA." W&M ScholarWorks, 2002. https://scholarworks.wm.edu/etd/1539616769.
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The results of life history studies involving the sailfish, Istiophorus platypterus, from the Atlantic, Pacific, and Indian oceans were reviewed. Results of studies agree on several aspects of sailfish biology; sailfish exhibit opportunistic feeding behavior, follow the 28??C isotherm, spawn in summer mature at approximately age 3, and are the least migratory of the billfishes. However, results are in conflict concerning sex ratio and whether sailfish are single or multiple spawners. Although many researchers have reported that sailfish are sexually dimorphic, their fragile otoliths make them difficult to age, aging studies have not been validated, and sexual dimorphism has not been adequately separated from differences in age at first maturity. Life history studies are further compromised because identification of early life history stages is difficult and effect of genetically distinct stocks on these studies is unknown. Molecular markers representing a range of genetic resolution were used to investigate the genetic stock structure of the sailfish within and between oceans and to discriminate sailfish from other istiophorid billfishes. to investigate the genetic basis of stock structure, a 1700 by region of mitochondria) DNA which included the control region, was surveyed with five restriction endonucleases and representative individuals were sequenced. In addition, five nuclear microsatellite loci were assayed. Approximately 647 sailfish were collected from throughout the species' range over a six-year period from the Atlantic, Pacific, and Indian Oceans. Both mitochondrial and nuclear markers found that Atlantic, eastern Pacific, and Indo-west Pacific sailfish represent distinct genetic stocks. In addition, mitochondrial data revealed the presence of diverse clades, which were probably formed during Pleistocene glaciation. Independent molecular markers based on mitochondrial and nuclear DNA were developed to provide positive identification of istiophorid and xiphiid billfishes. Both classes of markers are based on amplification of short segments (<1.7 kb) of DNA and subsequent digestion with informative restriction endonucleases. ND4 and MN32-2, the selected markers, allow unambiguous specific identification, although it was not possible to differentiate white marlin and striped marlin. The resulting keys provide two independent means for the forensic identification of fillets and for specific identification of early life history stages.
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Ferrette, Bruno Lopes da Silva. "Delimitação de espécies da família Istiophidae e de estoques genéticos do agulhão-vela Istiophorus platypterus no Oceano Atlântico." Botucatu, 2018. http://hdl.handle.net/11449/157323.
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Orientador: Fernando Fernandes MendonçaResumo: A atividade pesqueira desempenha um importante papel ambiental e socioeconômico, pois é fonte de renda e alimento para milhões de pessoas no mundo. Entretanto, falhas em sua gestão e lacunas nos dados biológicos para muitas espécies, tem resultado na sobreexplotação de seus estoques, o que pode impactar diversos ecossistemas marinhos. Neste contexto, os peixes-de-bico, grupo formado pelas famílias Xiphiidae e Istiophoridae, são considerados valiosos recursos pesqueiros, porém ainda não há consenso sobre o número e a validade das espécies da família Istiophoridae e também há incertezas sobre a avaliação atual de seus estoques. Sendo assim, o objetivo deste estudo é o de delimitar as espécies da família Istiophoridae e os estoques genéticos do agulhão-vela Istiophorus platypterus no Oceano Atlântico utilizando marcadores moleculares mitocondriais. Entre os resultados dos testes de delimitação de espécies, o número variou entre 6 e 12 táxons possíveis, dependendo do teste aplicado. Em relação a delimitação dos estoques genéticos de I. platypterus no Atlântico, assumindo-se apenas uma espécie no gênero Istiophorus, nossos resultados apontam a existência de alta diversidade genética, componde um único estoque genético no Atlântico (ΦST=0,01121, p=0,02438), apresentando um alto fluxo gênico. Porém, pela análise da rede de haplótipos e da inferência bayesiana observa-se a existência de diferentes linhagens mitocondriais simpátricas, que divergiram durante o Mioceno Superior e foram ... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Fishing activity plays an important environmental and socio-economic role, as it is a source of income and food for millions of people worldwide. Although, shortcomings in management and gaps in biological data for many species resulted in the overexploitation of their stocks, which may impact several marine ecosystems. In this context, billfishes, a group compounded by the Xiphiidae and Istiophoridae families, are considered valuable fish resources, but there is still no consensus on the number and validity of the species of Istiophoridae family and there are also uncertainties about the current fisheries stocks assessments. Thus, the main objectives of this study are to delimit the species of the Istiophoridae family and the genetic stocks of the sailfish, Istiophorus platypterus, in the Atlantic Ocean using mitochondrial molecular markers. Among the species delimitation tests results, the number ranged from 6 to 12 possible taxa depending on the test applied. In order to determine the genetic stock of I. platypterus in the Atlantic Ocean, assuming only one species in the genus Istiophorus, our results point to the existence of high genetic diversity, comprising a single genetic stock in the Atlantic (ΦST = 0.01121, p = 0.02438), presenting a high gene flow. However, the analysis of the network of haplotypes and Bayesian inference shows the existence of different sympatric mitochondrial lines, which diverged during the Upper Miocene and were re-approximated, interrupting th... (Complete abstract click electronic access below)
Doutor
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MOURATO, Bruno Leite. "Influência dos Fatores Ambientais e Espaçotemporais Na Abundância, Reprodução e Comportamento do Agulhão-vela, Istiophorus Platypterus (shaw & Nodder, 1791) No Oceano Atlântico." Universidade Federal de Pernambuco, 2012. https://repositorio.ufpe.br/handle/123456789/12141.
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CNPq
No presente trabalho foram investigados vários aspectos relacionados à dinâmica populacional, ecologia e pesca do agulhão-vela no Atlântico equatorial e sudoeste. As análises incluíram: (1) biologia reprodutiva; (2) modelagem da distribuição de tamanho e captura por unidade de esforço (CPUE) em relação aos efeitos ambientais e espaciais; (3) movimentos e utilização do habitat determinado por telemetria via-satélite e; (4) análise da CPUE de agulhão-vela capturado pela pesca esportiva no Brasil. A proporção sexual de agulhão-vela varia espaço-temporalmente na área de estudo e o comprimento de primeira maturação sexual estimado foi 147,21 cm de mandíbula inferior até a forquilha (MIF). A fecundidade variou entre 0,44 x 106 ovócitos hidratados para uma fêmea de 156 cm MIF e 2,26 x 106 ovócitos hidratados para uma fêmea de 183 cm LJFL. O Atlântico equatorial oeste não é uma área de desova, enquanto que a costa sudeste brasileira, ao contrário, se constitui em uma área de desova importante para a espécie, principalmente de dezembro a fevereiro. Altas densidades de adultos também foram observadas a oeste de 40°W, em ambas as partes da área de estudo, norte e sul. Por outro lado, uma tendência oposta foi observada em relação aos juvenis, que parecem estar associados a águas com temperatura da superfície do mar (TSM) superiores a 28°C com uma profundidade da camada de mistura mais profunda (> 50m), no lado ocidental, particularmente entre 10° - 20°S e 25° - 35°W. A modelagem da CPUE revelou uma agregação sazonal elevada ao longo da costa sudeste brasileira durante o pico de desova, enquanto que o centro-oeste do Atlântico, ao sul de ~ 15°S, bem como a costa norte brasileira, podem representar importantes áreas de alimentação durante o inverno. Os modelos também revelaram que a TSM e a velocidade do vento foram as variáveis mais importantes na variação da CPUE. Os resultados da telemetria via-satélite indicaram um claro padrão de utilização do habitat vertical, predominantemente concentrado próximo da superfície do mar com uma preferência relativamente estreita de temperatura. A "rota mais provável" sugerem que os agulhões-vela marcados não se deslocaram significativamente do local de marcação. Por fim, na presente tese, novos insights sobre a estrutura populacional da espécie no Oceano Atlântico foram apresentados e discutidos. Embora a separação do estoque do noroeste parece ser clara, ainda há uma grande incerteza sobre o grau de mistura entre os estoques do sudoeste e leste.
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Hoolihan, John Paul Jr School of Biological Earth & Environmental Sciences UNSW. "Biology of Arabian Gulf sailfish." Awarded by:University of New South Wales. School of Biological, Earth and Environmental Sciences, 2005. http://handle.unsw.edu.au/1959.4/20755.
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Biological and life history characteristics for a previously unstudied population of sailfish, Istiophorus platypterus, in the Arabian Gulf were investigated. Notable findings include temporal-spatial migration patterns for a genetically isolated population that is threatened by overexploitation. Conventional tagging resulted in 2053 releases and 114 recaptures (5.55%) inside the Gulf. Linear displacement ranged from 2.5 to 697 km, while days at liberty ranged from 17 to 818 days. Dead recoveries in Iranian gillnets account for 88.6% of recaptures. Modeling analyses produced a best estimate of annual survival probability (S) at 0.375 (slope = -0.101, SE = 0.324). Fifteen pop-up satellite archival tags were deployed on sailfish during 2001 - 2002 to track temporal and spatial movements. Extensive data from four tags showed 83.7% of time-at-depth was spent above 10 m with no significant difference (P < 0.05) in diel preference. Depth ranged from 0.0 m to 61.0 m, while temperature ranged from 19.7 ??C to 30.1 ??C. Small-scale movements of eight sailfish were measured using ultrasonic tracking for periods ranging from 3:33 to 53:06 hours. Track distances ranged from 5.5 to 78.5 km, while linear displacement ranged from 4.6 to 37.0 km. Average speed ranged from 0.29 to 0.75 m s-1. Vertical distributions showed 84.3% of time was spent above 10 m depth, even though water temperature showed negligible variation with depth. Mitochondrial DNA comparison of 147 sailfish produced 39 composite haplotypes using eight restriction enzymes. Significant differences occurred in the frequency between population groups inside and outside the Gulf (amova 34.8%, P < 0.01; FST = 0.356), along with evidence of restricted migration between them (average number of migrants, Nm = 0.903). Nine year classes (0-8) were determined from aging analysis of fin spines. Females (n = 50) ranged from 0 to 8 years, while males (n = 34) ranged from 0 to 6 years. Von Bertalanffy growth function indicated rapid growth during the first two years, after which males stabilized and females continued growing to a greater maximum mean length and weight. A comparison of allometric growth between sexes indicated no significant difference between length and other morphometric characters (P ranged 0.135 ??? 0.980).
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Simms, Jeffrey R. "Early life ecology of sailfish, Istiophorus platypterus, in the northern Gulf of Mexico." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-774.
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Sailfish, Istiophorus platypterus, are commonly taken by the recreational and
commercial fisheries in the Gulf of Mexico (Gulf) and larvae are frequently reported in
the region, indicating the Gulf's potential role as spawning and/or nursery ground of
sailfish. Five ichthyoplankton surveys were conducted in shelf and slope waters of the
northern Gulf during the summers of 2005 (May, July, September) and 2006 (June,
August). Surveys were conducted off the Texas and Louisiana coasts from 27 - 28N
and 88 - 94W. During the two year study, 2,426 sailfish larvae were collected, ranging
in size from 2.0 - 24.3 mm standard length (SL). Sailfish larvae were collected in 45.0%
of collections with a peak density ranging of 51.5 larvae per 1000 m-2 of water sampled,
and the highest larval abundances were observed within frontal features of the Loop
Current. Sagittal otoliths were extracted from 1,236 larvae, and otolith microstructure
analysis indicated sailfish ranged in age from 5 - 25 days post-hatch. Hatch-date
distributions indicated fish were from early May to mid September spawning and/or
hatching events. Instantaneous growth coefficients (g) ranged from 0.113 to 0.127 with
intra- and inter-annual variations in growth observed. Growth coefficients correspond to
a 10.7 - 11.9% increase in length per day. Instantaneous daily mortality rates (Z) were estimated from regressions of the decline in loge-transformed abundance on age and
ranged from 20.4% to 29.2% per day suggesting large losses during the early life
interval. Instantaneous weight-specific growth coefficients (G) ranged from 41.5% to
45.9% per day and were indexed to daily mortality to assess intra- and inter-annual
variation in recruitment potential. Recruitment indices > 1.0 were observed during all
surveys, suggesting cohort biomass was increasing and that conditions were favorable
for growth, survival and recruitment. The results of this study indicate that the northern
Gulf represents viable spawning and nursery habitat of sailfish and the sustainability of
Atlantic sailfish populations may be linked to spawning in the Gulf.
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Chen, Hung, and 陳鋐. "Stock assessment of sailfish(Istiophorus platypterus) in the Indian Ocean using data-limited methods." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/26144160796377936832.
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碩士國立臺灣海洋大學
環境生物與漁業科學學系
104
Sailfish (Istiophorus platypterus) is a highly migratory fish that inhabits tropical and subtropical Atlantic, Pacific and Indian Oceans. In the Indian Ocean, sailfish is mainly caught by gillnet and longline fleets of the countries around the Arabian Sea. Catches increased sharply since the 1990s and the average catch exceeded 29,000 tones in recent years. Due to lack of biological information and effort for sailfish in the Indian Ocean, this study adopts Catch-MSY method and Depletion-Based Stock Reduction Analysis, which need only history catch and prior distribution of life history parameters and stock parameters, to conduct the assessment for sailfish in the Indian Ocean. The results of both methods indicate that catches and fishing mortality substantially increased and biomass decreased gradually since the 1990s. Currently, the stock status is not overfished. However, fishing mortality obtained from Catch-MSY method is at a high level, while, fishing mortality obtained from DB-SRA is still below FMSY. Comparing to Catch-MSY method, the estimates of DB-SRA are more robust and DB-SRA can incorporate more biological and stock parameters. However, the results of this study indicate that the model estimations of DB-SRA are influenced by the assumption of depletion. To further understand the population dynamics of sailfish in the Indian Ocean, improvements in data collection and quality of fishery statistics and are necessary. In addition, biological studies of sailfish in the Indian Ocean should be enhanced simultaneously.
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Tsai, Chung-Nan, and 蔡政南. "Trophic Size-structure and Feeding Ecology of Sailfish, Istiophorus platypterus, in Eastern Taiwan Waters." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/90575804482892397807.
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博士國立臺灣大學
海洋研究所
102
Fishery stock assessment and management used to focus on single species method. FAO promoted the ecosystem-based fishery management (EBFM) for the sustainability of living aquatic resources. EBFM need to be taken into account with trophic structure and flows of biomass through species interactions. In present study, nitrogen and carbon stable isotopes analyses were applied to investigate the trophic structure of sailfish. A total of 263 sailfish muscle samples were examined. The δ15N values for sailfish ranged from 7.51 to 14.19 &;#8240; (mean=12.06&;#8240; ± 1.16) and the δ13C values ranged from -22.04 to -15.48 &;#8240; (mean=-17.62&;#8240; ± 1.10). The δ15N values were positively related to body length, while δ13C were negatively related to body length. The results revealed the different size class of sailfish occupied different trophic position of pelagic ecosystem. We postulate that the factors which influence on trophic position of sailfish between young and adult were food sources, habitats and migratory pattern. Stable isotope ratios of a consumer are related to those of its prey. Stable isotope mixing model was used to estimate diet composition of consumer by mass balance equation. In this study, stable isotope mixing model was applied by carbon and nitrogen stable isotopes of sailfish to estimate the food sources of their prey. The sailfish were segregated by juveniles (<140cm, LJFL), maturing stage (141-180cm, LJFL) and adults (>181cm, LJFL) from previous research. The most important preys for juvenile sailfish were Bramidae (15.90%), Mene maculata (11.04%) and Clupeidae (9.62%). Therefore, adult sailfish feed on Trichiurus lepturus (32.63%), followed by Katsuwonus pelamis (15.82%) and Priacanthus macracanthus (11.30%). In spite of the apparent high prey diversity of diet composition for sailfish, they feed mainly on epipelagic species in the waters off eastern Taiwan. Food web is an important element in pelagic ecosystem to transport nutrients and energy flow between consumers and prey. In order to investigate the role of sailfish and to explore the function and structure of pelagic ecosystem in eastern Taiwan waters, we applied Ecopath with Ecosim model inferred from stable isotope analysis, stomach content analysis and fisheries statistical data to perform pelagic trophic model of eastern Taiwan. The results reveal that the trophic level of the functional groups varied from 1.0 to 4.52. Marine mammals and shark are occupied top trophic level. Total ecosystem throughput is 3054.43 t/km2/yr. Sum of all production, sum of all consumption and sum of all respiratory flows are 1787.29, 824.89 and 528.62 t/km2/yr, respectively. Total primary production to total respiration ratio is 3.13. Connectance Index (CI) and System Omnivory Index (SOI) are 0.47 and 0.25, respectively. In this study, we preliminary established pelagic trophic model in eastern Taiwan and the results can provide scientific references for ecosystem-based fisheries management. Ecosim model was applied to predict biomass trajectories of each functional groups in next 50 years. The predicted biomass trends indicate that if we maintain current fishing efforts in eastern Taiwan will reduce most of biomass of top predators in the future (e.g. Marine mammals, tuna, billfish and shark). The results show current fishing efforts in eastern Taiwan is still high, we suggest the fish stock need to be monitored and fishing efforts should be further reduced.
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Chiang, Wei-Chuan, and 江偉全. "Population dynamics and stock assessment of sailfish (Istiophorus platypterus)in waters off eastern Taiwan." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/97567047578403142498.
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博士國立臺灣大學
海洋研究所
92
Age-growth and reproductive biology of sailfish were studied and the results were applied to yield per recruit (Y/R) and spawning stock biomass per recruit (SSB/R) analysis to assess the current stock of sailfish in the waters off eastern Taiwan. Length and weight data were collected monthly from a total of 6,279 sailfish (1,927 females and 4,352 males) landed in Shinkang Fish Market during July 1998 to December 2002. The fish sizes ranged from 78 to 239 cm LJFL (lower jaw fork length) or 1 to 60 kg RW (round weight). The proportion of females increased with fish size and reached 100% at fish size larger than 227 cm or 46 kg. Age and growth were examined by counting growth rings on cross sections of the fourth spine of the first dorsal fin of 1,135 (436 female and 699 male) sailfish. Significant differences were found in length-at-age and estimated growth parameters between sexes. Females grew faster and reached larger sizes than males. The generalized von Bertalanffy growth parameters estimated for females were the following: asymptotic length (L∞) = 343.8 cm, growth coefficient (K) = 0.011 yr-1, age at zero length (t0) = –0.468yr, and the fitted fourth parameter (m) = –1.639. The growth parameters estimated for males were the following: asymptotic length (L∞) = 294.0 cm, growth coefficient (K) = 0.023 yr-1, age at zero length (t0) = –0.704 yr, and the fitted fourth parameter (m) = –1.288. Monthly variations in gonadosomatic index of 528 sailfish and histological examination on the 391 gonad tissue provided the basis to define the different stages of maturity. This information indicated that the sailfish spawned from April to September. Length at 50% maturity was 166.376 cm and 151.556 cm, respectively for females and males. Sailfish are a multiple spawning species, the spawning frequency was 1.89 days, batch fecundity equaled 0.2–2.48 million eggs. The relationship between batch fecundity in millions (BF) and weight (kg) or length (cm) was: BF = 2.03×10-3 RW1.936 (r 2 = 0.714; n = 18) and BF = 5.46×10-15 LJFL6.283 (r 2 = 0.667). Via age-length transformation and catch curve analysis, total mortality rate (Z) was estimated as 0.56 and 0.58 yr-1, and the natural mortality rate (M) was 0.26 and 0.27 yr-1 respectively for females and males as obtained using Pauly’s empirical equation. The effects of different levels of M (0.20, 0.26, 0.30, 0.35 yr-1 for females and 0.20, 0.27, 0.30, 0.35 yr-1 for males), fishing mortality (F, 0–1.0 yr-1) and age at first capture (tc, 1–10 yr) on Y/R and SSB/R of sailfish were evaluated. The results showed that at the current tc of 5 yr and the current M of 0.26 yr-1 for females and 0.27 yr-1 for males, the current F values were below F0.1 for both sexes. SSB/R was 14.90 kg and spawning potential ratio (SPR) was 38.6 %. The sailfish in the waters off eastern Taiwan appear to be moderately exploited. However, in view of the recent rapid increase in fishing effort, it is evident that the stock condition and developments in the fishery still need to be monitored.
10
Guang-Rung, Hu, and 胡光榮. "Effects of four different drying methods on the quality of dried sailfish, Istiophorus platypterus." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/33944407716698990642.
Full textAbstract:
碩士國立屏東科技大學
熱帶農業暨國際合作系所
95
This study was to investigate the effects of four different drying methods on the qualities of dried products of sailfish、Istiophorus platypterus、caught on the eastern coast of Taiwan. The methods used included smoking, sun drying、hot-air、and cold-air drying. Sensory related properties、including water activity (Aw)、sensory evaluation and color values (L、a and b) were monitored during the 3-month storage. AW of all the products dried by the four different methods was significantly different during the storage period. Results of the analysis of L value showed no significant difference among the four drying methods. However、a and b values increased with the increase of time. In the product prepared by sun drying、oxidative stabilities、including peroxide value (POV)、acid value (AV) and thiobarbituric acid value (TBA) were determined during the 3-months storage. The results showed that POV、 AV and TBA values in the sun dried product incresed with the increase of the storage time up to 3 months. However、there was no signifirant change in the three values in the smoked products throughout the storage.
Book chapters on the topic "Istiophorus platypterus"
1
"Catch and Release in Marine Recreational Fisheries." In Catch and Release in Marine Recreational Fisheries, edited by Eric D. Prince, Mauricio Ortiz, and Arietta Venizelos. American Fisheries Society, 2002. http://dx.doi.org/10.47886/9781888569308.ch8.
Full textAbstract:
<em> Abstract.</em>—This study evaluates the performance of circle and comparable-size “J” hooks on Atlantic and Pacific sailfish <em> Istiophorus platypterus </em>and, to a lesser extent, on Pacific blue marlin <em> Makaira nigricans</em>. Terminal gear performances were assessed in terms of fishing success, hook location, and bleeding associated with physical hook damage and trauma. Evaluations of trolling with dead bait took place off Iztapa, Guatemala, during the spring and summer of 1999, and assessment of drifting/kite fishing with live bait took place off South Florida during the summer of 1999.
2
"Catch and Release in Marine Recreational Fisheries." In Catch and Release in Marine Recreational Fisheries, edited by Eric D. Prince, Mauricio Ortiz, Arietta Venizelos, and David S. Rosenthal. American Fisheries Society, 2002. http://dx.doi.org/10.47886/9781888569308.ch21.
Full textAbstract:
<em>Abstract.</em>—The Cooperative Tagging Center (CTC) of the National Marine Fisheries Service’s Southeast Fisheries Science Center operates one of the largest and oldest fish tagging programs of its type in the world. Since 1954, more than 35,000 recreational and commercial fishing constituents have voluntarily participated in the CTC, and this has resulted in tagging more than 245,000 fish of 123 species. Although some tagging activities have been conducted by scientists, most of the tag release and recovery activities were achieved by recreational and commercial fishery constituents. Five large highly migratory species have historically represented the Program’s primary target species, including Atlantic bluefin tuna <em> Thunnus thynnus</em>, blue marlin <em> Makaira nigricans</em>, white marlin <em> Tetrapturus albidus</em>, sailfish <em> Istiophorus platypterus</em>, and broadbill swordfish <em> Xiphias gladius</em>. Tagging equipment and procedures for catching, tagging, and resuscitation of species too large to be brought aboard fishing vessels have evolved and improved considerably over the years. This paper presents a review of the development of the most efficient tagging, handling, and dehooking techniques used on a variety of large, highly migratory species in the CTC. In addition, the results of a comparative tag retention study on billfish are presented, comparing stainless steel dart tags used for nearly 30 years with a hydroscopic nylon double-barb dart tag, recently developed in conjunction with The Billfish Foundation. Recommendations are made on the best techniques, procedures, and equipment for in-water tagging of large, highly migratory species.