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Registros recuperados: 7
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Characterisation of 22 polymorphic microsatellite loci for the Broadbill Swordfish, Xiphias gladius ArchiMer
Bradman, H.; Grewe, P.; Bourjea, Jerome; Muths, Delphine; Appleton, B..
The Broadbill Swordfish is harvested by fisheries throughout the world. In order to devise more effective management strategies, we need a clear understanding of the population structure of the species. From a library of 29 tetranucleotide repeats, 22 microsatellite markers were characterised for 94 swordfish samples captured from eastern and western Australia. The number of alleles ranged from 2 to 26 and observed heterozygosity from 0.066 to 0.923. We have identified 18 microsatellites that will be valuable in the examination of swordfish population structure.
Tipo: Text Palavras-chave: Swordfish; Xiphias gladius; Microsatellite; Genetic markers.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00037/14805/12428.pdf
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Otolith shape as a valuable tool to evaluate the stock structure of swordfish (Xiphias gladius) in the Indian Ocean ArchiMer
Mahe, Kelig; Evano, Hugues; Mille, Tiphaine; Bourjea, Jerome.
Swordfish (Xiphias gladius) is an oceanic-pelagic species currently fully exploited by several fisheries in the Indian Ocean, with suspicion of overexploitation in the southwest, but without a clear understanding of the real stock structure within this Ocean. Population structure of the Indian stock was studied in the western Indian Ocean using 395 individual samples collected from 2009 to 2014. Sagittal otoliths of the fish have been removed and shape analysis performed on these calcified pieces. Otolith morphometrics data and normalized Elliptical Fourier Descriptors (EFDs) were then extracted automatically by the dedicated imageanalysis system TNPC. Preliminary, side effect was tested by Redundancy analysis (RDA) combined to permutation tests on 91...
Tipo: Text Palavras-chave: Xiphias gladius; Otolith shape; Fourier descriptors; Stock discrimination; Indian Ocean.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00269/37980/36068.pdf
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OTOLITHE –ESPADON : Evaluation de la structure du stock d’espadon de l’océan indien à partir des analyses de forme des otolithes ArchiMer
Bourjea, Jerome; Mille, Tiphaine; Evano, Hugues; Mahe, Kelig.
L’espadon (Xiphias gladius) de l’océan Indien est actuellement une ressource évaluée comme étant pleinement exploitée à l’échelle de cet océan, avec un risque de surexploitation dans le sud-ouest de l’océan Indien. Une précédente étude a permis de démontrer que les espadons de l’océan Indien ne formaient qu’une seule et même population génétique (conclusion du projet IOSSS – ESPADON). L’objectif de ce projet a été d’explorer la forme de 395 otolithes d’espadons collectés dans sept zones différentes de l’océan Indien pour identifier s’ils provenaient de stocks différents ou non. Cette étude a permis de tirer 5 conclusions principales : les otolithes gauche et droit de l’espadon sont significativement similaires. 1- il n’y a pas d’effet de la taille des...
Tipo: Text Palavras-chave: Espadon; Xiphias gladius; Otolithe; Descripteur de Fourier; Stock; Océan Indien; Forme.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00272/38324/36565.pdf
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Reproductive dynamics of swordfish (Xiphias gladius) in the southwestern Indian Ocean (Reunion Island). Part 1: oocyte development, sexual maturity and spawning ArchiMer
Poisson, Francois; Fauvel, Christian.
The reproductive dynamics of swordfish (Xiphias gladius) was investigated from catches of the Reunion Island-based longline swordfish fishery between 19-25 degrees S and 48-54 degrees E. Thus, 1727 swordfish (size range 75-289 cm, lower jaw-to-fork length, LJFL) were sampled on board commercial fishing vessels during the period of May 1998 to January 2001. Reproductive activity was assessed using macroscopic gonad characteristics, trends of gonadal indexes for both sexes, oocyte size-frequency distributions and microscopic investigation of oocyte development stages. Size at first maturity (L-50) for female and male swordfish was estimated in Indian Ocean for the first time. L50 was estimated at 170 cm and 120 cm (LJFL) for females and males, respectively....
Tipo: Text Palavras-chave: Indian Ocean; Xiphias gladius; Swordfish; Seasonal distribution; Size at first maturity; Histology; Spawning season; Sex ratio; Reproduction.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6353.pdf
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Reproductive dynamics of swordfish (Xiphias gladius) in the southwestern Indian Ocean (Reunion Island). Part 2: fecundity and spawning pattern ArchiMer
Poisson, Francois; Fauvel, Christian.
Batch fecundity and relative fecundity of swordfish (Xiphias gladius) in the southwestern Indian Ocean were estimated from seven gravid swordfish females (size range 127-225 cm lower jaw-to-fork length, LJFL) with unovulated, hydrated oocytes collected onboard Reunion-based (France) longline swordfish fishing vessels between December 1999 to January 2001. To investigate the spawning pattern of swordfish, we used data collected through a combination of two at sea sampling regimes. A total of 17 007 geo-located size data of swordfish were recorded during 8 years (1993-2001) and a total of 1727 (size range 75-289 cm, LJFL) swordfish gonads (1107 females and 620 males) were sampled from May 1998 to January 2001. The estimated batch fecundity ranged from 995...
Tipo: Text Palavras-chave: Xiphias gladius; Swordfish; Reproductive strategy; Gravimetric method; Image processing; Spawning frequency; Indian Ocean; Fecundity; Reproduction.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6354.pdf
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Stock structure of the swordfish (Xiphias gladius) in the southwest Indian Ocean: A preliminary study ArchiMer
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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Swordfish Serpent
Swimming
Tipo: Video Palavras-chave: Xiphiidae (Swordfish); Xiphias gladius.
Ano: 2005 URL: http://archive.serpentproject.com/672/
Registros recuperados: 7
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