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Otolith shape variation provides a marker of stock origin for north Atlantic bluefin tuna (Thunnus thynnus) (CROSBI ID 221245)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Deirdre, Brophy ; Paula, Haynes ; Haritz, Arrizabalaga ; Igaratza, Fraile ; Jean Marc, Fromentin ; Fulvio, Garibaldi ; Katavić, Ivan ; Fausto, Tinti ; F., Saadet Karakulak ; David, Macías et al. Otolith shape variation provides a marker of stock origin for north Atlantic bluefin tuna (Thunnus thynnus) // Marine and freshwater research, 67 (2015), 7; 1023-1036. doi: 10.1071/MF15086

Podaci o odgovornosti

Deirdre, Brophy ; Paula, Haynes ; Haritz, Arrizabalaga ; Igaratza, Fraile ; Jean Marc, Fromentin ; Fulvio, Garibaldi ; Katavić, Ivan ; Fausto, Tinti ; F., Saadet Karakulak ; David, Macías ; Dheeraj, Busawon ; Alex, Hanke ; Ai, Kimoto ; Osamu, Sakai ; Simeon, Deguara ; Nouredinne, Abid ; Miguel Neves, Santos

engleski

Otolith shape variation provides a marker of stock origin for north Atlantic bluefin tuna (Thunnus thynnus)

Two stocks of bluefin tuna (Thunnus thynnus) inhabit the north Atlantic ; the western and eastern stocks spawn in the Gulf of Mexico and the Mediterranean Sea respectively. Trans Atlantic movements occur outside spawning time whereas natal homing maintains stock structure. Commercial fisheries may exploit a mixed assemblage of both stocks. The incorporation of mixing rates into stock assessment is precluded by uncertainties surrounding stock discrimination. Otolith shape descriptors were used to characterise western and eastern stocks of Atlantic bluefin tuna in the present study and to estimate stock composition in catches of unknown origin. Otolith shape varied with length and between locations and years. Within a restricted size range (200–297-cm fork length (FL)) the two stocks were distinguished with an accuracy of 83%. Bayesian stock mixture analysis indicated that samples from the east Atlantic and Mediterranean were predominantly of eastern origin. The proportion assigned to the eastern stock showed slight spatial variation ; however, overlapping 95% credible intervals indicated no significant difference (200–297 cm FL: central Atlantic, 73–100% ; Straits of Gibraltar, 73–100% ; Morocco, 50–99% ; Portugal 64–100%). Otolith shape could be used in combination with other population markers to improve the accuracy of mixing rate estimates for Atlantic bluefin tuna.

elliptical Fourier analysis; population structure; stock mixture analysis

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Podaci o izdanju

67 (7)

2015.

1023-1036

objavljeno

1323-1650

10.1071/MF15086

Povezanost rada

Poljoprivreda (agronomija)

Poveznice
Indeksiranost