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 ex...
Published in: | Marine and Freshwater Research |
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CSIRO Publishing
2016
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Online Access: | http://hdl.handle.net/10379/10552 https://doi.org/10.1071/mf15086 |
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ftnuigalway:oai:aran.library.nuigalway.ie/:10379/10552 2023-06-11T04:14:31+02:00 Otolith shape variation provides a marker of stock origin for north atlantic bluefin tuna (thunnus thynnus) Brophy, Deirdre Haynes, Paula Arrizabalaga, Haritz Fraile, Igaratza Fromentin, Jean Marc Garibaldi, Fulvio Katavic, Ivan Tinti, Fausto Karakulak, F. Saadet Mac�as, David Busawon, Dheeraj Hanke, Alex Kimoto, Ai Sakai, Osamu Deguara, Simeon Abid, Nouredinne Santos, Miguel Neves 2016-01-01 http://hdl.handle.net/10379/10552 https://doi.org/10.1071/mf15086 unknown CSIRO Publishing Marine and Freshwater Research Brophy, Deirdre; Haynes, Paula; Arrizabalaga, Haritz; Fraile, Igaratza; Fromentin, Jean Marc; Garibaldi, Fulvio; Katavic, Ivan; Tinti, Fausto; Karakulak, F. Saadet; Mac�as, David; Busawon, Dheeraj; Hanke, Alex; Kimoto, Ai; Sakai, Osamu; Deguara, Simeon; Abid, Nouredinne; Santos, Miguel Neves (2016). Otolith shape variation provides a marker of stock origin for north atlantic bluefin tuna (thunnus thynnus). Marine and Freshwater Research 67 (7), 1023-1036 1323-1650 http://hdl.handle.net/10379/10552 doi:10.1071/mf15086 Attribution-NonCommercial-NoDerivs 3.0 Ireland https://creativecommons.org/licenses/by-nc-nd/3.0/ie/ elliptical fourier analysis population structure stock mixture analysis population-structure mitochondrial-DNA mediterranean sea carrying-capacity holistic approach spatial structure western atlantic fish management identification Article 2016 ftnuigalway https://doi.org/10.1071/mf15086 2023-05-28T18:05:04Z 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. Article in Journal/Newspaper North Atlantic National University of Ireland (NUI), Galway: ARAN Marine and Freshwater Research 67 7 1023 |
institution |
Open Polar |
collection |
National University of Ireland (NUI), Galway: ARAN |
op_collection_id |
ftnuigalway |
language |
unknown |
topic |
elliptical fourier analysis population structure stock mixture analysis population-structure mitochondrial-DNA mediterranean sea carrying-capacity holistic approach spatial structure western atlantic fish management identification |
spellingShingle |
elliptical fourier analysis population structure stock mixture analysis population-structure mitochondrial-DNA mediterranean sea carrying-capacity holistic approach spatial structure western atlantic fish management identification Brophy, Deirdre Haynes, Paula Arrizabalaga, Haritz Fraile, Igaratza Fromentin, Jean Marc Garibaldi, Fulvio Katavic, Ivan Tinti, Fausto Karakulak, F. Saadet Mac�as, David Busawon, Dheeraj Hanke, Alex Kimoto, Ai Sakai, Osamu Deguara, Simeon Abid, Nouredinne Santos, Miguel Neves Otolith shape variation provides a marker of stock origin for north atlantic bluefin tuna (thunnus thynnus) |
topic_facet |
elliptical fourier analysis population structure stock mixture analysis population-structure mitochondrial-DNA mediterranean sea carrying-capacity holistic approach spatial structure western atlantic fish management identification |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Brophy, Deirdre Haynes, Paula Arrizabalaga, Haritz Fraile, Igaratza Fromentin, Jean Marc Garibaldi, Fulvio Katavic, Ivan Tinti, Fausto Karakulak, F. Saadet Mac�as, David Busawon, Dheeraj Hanke, Alex Kimoto, Ai Sakai, Osamu Deguara, Simeon Abid, Nouredinne Santos, Miguel Neves |
author_facet |
Brophy, Deirdre Haynes, Paula Arrizabalaga, Haritz Fraile, Igaratza Fromentin, Jean Marc Garibaldi, Fulvio Katavic, Ivan Tinti, Fausto Karakulak, F. Saadet Mac�as, David Busawon, Dheeraj Hanke, Alex Kimoto, Ai Sakai, Osamu Deguara, Simeon Abid, Nouredinne Santos, Miguel Neves |
author_sort |
Brophy, Deirdre |
title |
Otolith shape variation provides a marker of stock origin for north atlantic bluefin tuna (thunnus thynnus) |
title_short |
Otolith shape variation provides a marker of stock origin for north atlantic bluefin tuna (thunnus thynnus) |
title_full |
Otolith shape variation provides a marker of stock origin for north atlantic bluefin tuna (thunnus thynnus) |
title_fullStr |
Otolith shape variation provides a marker of stock origin for north atlantic bluefin tuna (thunnus thynnus) |
title_full_unstemmed |
Otolith shape variation provides a marker of stock origin for north atlantic bluefin tuna (thunnus thynnus) |
title_sort |
otolith shape variation provides a marker of stock origin for north atlantic bluefin tuna (thunnus thynnus) |
publisher |
CSIRO Publishing |
publishDate |
2016 |
url |
http://hdl.handle.net/10379/10552 https://doi.org/10.1071/mf15086 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Marine and Freshwater Research Brophy, Deirdre; Haynes, Paula; Arrizabalaga, Haritz; Fraile, Igaratza; Fromentin, Jean Marc; Garibaldi, Fulvio; Katavic, Ivan; Tinti, Fausto; Karakulak, F. Saadet; Mac�as, David; Busawon, Dheeraj; Hanke, Alex; Kimoto, Ai; Sakai, Osamu; Deguara, Simeon; Abid, Nouredinne; Santos, Miguel Neves (2016). Otolith shape variation provides a marker of stock origin for north atlantic bluefin tuna (thunnus thynnus). Marine and Freshwater Research 67 (7), 1023-1036 1323-1650 http://hdl.handle.net/10379/10552 doi:10.1071/mf15086 |
op_rights |
Attribution-NonCommercial-NoDerivs 3.0 Ireland https://creativecommons.org/licenses/by-nc-nd/3.0/ie/ |
op_doi |
https://doi.org/10.1071/mf15086 |
container_title |
Marine and Freshwater Research |
container_volume |
67 |
container_issue |
7 |
container_start_page |
1023 |
_version_ |
1768392583163150336 |