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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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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; Muths, D.; Bourjea, Jerome.
Swordfish Xiphias gladius is an oceanic-pelagic species. Its population structure in the Western Indian Ocean was studied from the shape of the sagittal otoliths of 391 individuals collected from 2009 to 2014. Normalised elliptical Fourier descriptors (EFDs) were extracted automatically using TNPC software. Principal components analysis (PCA) conducted on EFDs showed no significant effect of side (i.e. left or right otolith). Consequently, all 391 sagittal otoliths were used to identify stocks among six geographical areas: Reunion Island, Mozambique Channel, Rodrigues, South Africa, Madagascar South and Sri Lanka. To investigate the effects of sex, sampling year, sampling season, lower jaw fork length or geographical area on variations in otolith shape,...
Tipo: Text Palavras-chave: Connectivity; Fourier descriptors; Morphometric markers; Sagittal otoliths; Stock discrimination.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00354/46527/46411.pdf
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Spawning energetics and otolith microchemistry provide insights into the stock structure of bonga shad Ethmalosa fimbriata ArchiMer
Doering, Julian; Wagner, Carola; Tiedemann, Maik; Brehmer, Patrice; Ekau, Werner.
The gross energy content of spawning batches and the microchemistry of sagittal otoliths in individual female bonga shad Ethmalosa fimbriata were compared between contrasting sampling sites at the Senegalese southern coast and inside the hypersaline Sine Saloum Estuary. Results show that females spawning in the estuary's middle reaches invested almost three times more energy into reproduction (115 +/- 65 J g(-1) body mass) than their neritic counterparts (39 +/- 34 J g(-1) body mass). Also, female otolith levels of Ba:Ca, Sr:Ca and Zn:Ca either differed significantly between study sites or could be linked to heterogeneous environmental variables. A quadratic discriminant function analysis provided evidence of segregated spawning populations of E. fimbriata...
Tipo: Text Palavras-chave: Clupeidae; Inverse estuary; Oocyte; Reproductive investment; Senegal; Stock discrimination; Spawning components.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00484/59567/62545.pdf
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