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| Muths, Delphine; Grewe, R.; Jean, Claire; Bourjea, Jerome. |
| Genetic variation was surveyed at 11 microsatellite loci and at 517 bp of the mitochondrial control region to investigate the presence of genetic stock structure in swordfish (Xiphias gladius) in four proximal localities of the southwest Indian Ocean. One aim of this study was to serve as a preliminary examination for congruency of structure detected by these two genetic markers, prior to conducting a more comprehensive basin-wide survey of the Indian Ocean and nearby surrounding areas. Analyses of multilocus microsatellite genotypes and mitochondrial control region sequences both revealed a great homogeneity between samples. Genetic diversity detected at the regional scale was not significantly higher than detected at the local scale. Results suggest that... |
| Tipo: Text |
Palavras-chave: Indian Ocean; Population genetic; MtDNA; Microsatellites; Swordfish. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6455.pdf |
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| Fromentin, Jean-marc. |
| In the recent past, it has been put forward that recruitment of the North Atlantic albacore, East Atlantic bluefin tuna and North Atlantic swordfish could be related to the North AtlanticOscillation (NAO). In this document, the biological processes behind the NAO/recruitmentrelationship are further investigated. Then, the possible relationship between the East Atlanticbluefin tuna recruitment was re-investigated. The linear relationship appeared to be only due to the low frequency signal, both BFT recruitment and NAO displaying a pseudo-cyclic upwardtrend, but year-to-year fluctuations were not synchronous. The superposed epoch analysis, thatwas conducted to test for possible non-linear and non-monotonous relationship did not reveal any clear connection.... |
| Tipo: Text |
Palavras-chave: North Atlantic Oscillation; Recruitment; Bluefin; Albacore; Swordfish; Migration patterns; Time series; Spatially disaggregated data. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/00194/30498/28908.pdf |
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| Le Couls, Sarah; Bourjea, Jerome. |
| Cette synthèse bibliographique présente les différentes commissions internationales de gestion des grands pélagiques dans les océans Indien, Atlantique et Pacifique, respectivement la CTOI, la CICTA et l'IATTC/WCPFC. De plus, cette synthèse focalise sur le cas de l'espadon Xiphias gladius et détaille pour chaque stock, les captures, l'état du stock ainsi que les mesures de gestion passées et en cours. Le stock de la Méditerranée est l'unique stock en état de surexploitation avéré et fait l'objet de mesures de gestion (interdiction des filets dérivants, fermeture saisonnière de la pêche) mais pas de TAC. Les stocks de l'Atlantique Nord, du Pacifique Sud-est, et de l'Océan Indien sont proches de la pleine exploitation voir en pleine exploitation. Parmi ces... |
| Tipo: Text |
Palavras-chave: Espadon; Évaluation de la ressource; Océan Atlantique; Océan Pacifique; Océan indien; Mediterranée; Pleine exploitation; TAC; Quota; Swordfish; Resources assessment; Atlantic ocean; Pacific ocean; Indien ocean; Mediterranean sea; Full exploitation; TAC; Quota. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00001/11211/7565.pdf |
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| Jean, Claire; Bourjea, Jerome; Jouen, Emmanuel; Taquet, Marc. |
| Stock structure of swordfish (Xiphias gladius Linnaeus, 1758) from four areas of the South West Indian Ocean was conducted using Restriction Fragment Length Polymorphism (RFLP) on mtDNA control region and six amplified microsatellite loci. No significant differences were found among the four locations using either molecular technique. Most variability was found within populations, with only a small proportion of variation among samples, suggesting a unique stock of swordfish in the South West Indian Ocean. The sample size of this study is too small to reveal significant structure among the sampling locations. These results are baseline for a future larger scale project in the whole Indian Ocean. |
| Tipo: Text |
Palavras-chave: Indian Ocean; Microsatellite loci; MtDNA; Xiphias gladius; Swordfish. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-2313.pdf |
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| Gillepsie, K; Coelho, R; Farley, J; Garibaldi, F; Gioacchini, G; Pappalardo, L; Poisson, Francois; Quelle, P; Rosa, D; Saber, S. |
| This report describes the June, 2019 ICCAT workshop on swordfish biology studies for growth, reproduction and genetics, hosted by the Instituto Português do Mar e da Atmosfera, Olhão, Portugal . The major objectives of the workshop were to 1) refine sampling and biological data collection protocols, 2) develop protocols and start the sample processing and analysis, and 3) plan for the project future steps. The biological sampling program was established by ICCAT’s Swordfish Species Group in 2018, aiming to improve knowledge of the stock distribution, age and gender of the catch, growth rate, age at maturation, maturation rate, spawning season and location and diet. This work will contribute to the next major advance in the assessment of swordfish status,... |
| Tipo: Text |
Palavras-chave: Swordfish; Genetics; Maturity; Ageing. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00615/72693/71697.pdf |
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