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 |
---|---|
Main Authors: | , , , , , , , , , , , , , , , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2016
|
Subjects: | |
Online Access: | http://hdl.handle.net/11585/523140 https://doi.org/10.1071/MF15086 http://www.publish.csiro.au/paper/MF15086.htm http://www.publish.csiro.au/?act=view_file&file_id=MF15086.pdf |
id |
ftunibolognairis:oai:cris.unibo.it:11585/523140 |
---|---|
record_format |
openpolar |
spelling |
ftunibolognairis:oai:cris.unibo.it:11585/523140 2024-04-14T08:15:37+00:00 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 Karakulak, F. Saadet Macìas, David Busawon, Dheeraj Hanke, Alex Kimoto, Ai Sakai, Osamu Deguara, Simeon Abid, Nouredinne Santos, Miguel Neves TINTI, FAUSTO Brophy, Deirdre Haynes, Paula Arrizabalaga, Haritz Fraile, Igaratza Fromentin, Jean Marc Garibaldi, Fulvio Katavic, Ivan Tinti, Fausto Karakulak, F. Saadet Macìas, David Busawon, Dheeraj Hanke, Alex Kimoto, Ai Sakai, Osamu Deguara, Simeon Abid, Nouredinne Santos, Miguel Neves 2016 STAMPA http://hdl.handle.net/11585/523140 https://doi.org/10.1071/MF15086 http://www.publish.csiro.au/paper/MF15086.htm http://www.publish.csiro.au/?act=view_file&file_id=MF15086.pdf eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000378929600015 volume:67 issue:7 firstpage:1023 lastpage:1036 numberofpages:14 journal:MARINE AND FRESHWATER RESEARCH http://hdl.handle.net/11585/523140 doi:10.1071/MF15086 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84975275194 http://www.publish.csiro.au/paper/MF15086.htm http://www.publish.csiro.au/?act=view_file&file_id=MF15086.pdf elliptical Fourier analysis population structure stock mixture analysis info:eu-repo/semantics/article 2016 ftunibolognairis https://doi.org/10.1071/MF15086 2024-03-21T17:36:38Z 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 IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) Marine and Freshwater Research 67 7 1023 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
op_collection_id |
ftunibolognairis |
language |
English |
topic |
elliptical Fourier analysis population structure stock mixture analysis |
spellingShingle |
elliptical Fourier analysis population structure stock mixture analysis Brophy, Deirdre Haynes, Paula Arrizabalaga, Haritz Fraile, Igaratza Fromentin, Jean Marc Garibaldi, Fulvio Katavic, Ivan Karakulak, F. Saadet Macìas, David Busawon, Dheeraj Hanke, Alex Kimoto, Ai Sakai, Osamu Deguara, Simeon Abid, Nouredinne Santos, Miguel Neves TINTI, FAUSTO 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 |
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. |
author2 |
Brophy, Deirdre Haynes, Paula Arrizabalaga, Haritz Fraile, Igaratza Fromentin, Jean Marc Garibaldi, Fulvio Katavic, Ivan Tinti, Fausto Karakulak, F. Saadet Macìas, David Busawon, Dheeraj Hanke, Alex Kimoto, Ai Sakai, Osamu Deguara, Simeon Abid, Nouredinne Santos, Miguel Neves |
format |
Article in Journal/Newspaper |
author |
Brophy, Deirdre Haynes, Paula Arrizabalaga, Haritz Fraile, Igaratza Fromentin, Jean Marc Garibaldi, Fulvio Katavic, Ivan Karakulak, F. Saadet Macìas, David Busawon, Dheeraj Hanke, Alex Kimoto, Ai Sakai, Osamu Deguara, Simeon Abid, Nouredinne Santos, Miguel Neves TINTI, FAUSTO |
author_facet |
Brophy, Deirdre Haynes, Paula Arrizabalaga, Haritz Fraile, Igaratza Fromentin, Jean Marc Garibaldi, Fulvio Katavic, Ivan Karakulak, F. Saadet Macìas, David Busawon, Dheeraj Hanke, Alex Kimoto, Ai Sakai, Osamu Deguara, Simeon Abid, Nouredinne Santos, Miguel Neves TINTI, FAUSTO |
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) |
publishDate |
2016 |
url |
http://hdl.handle.net/11585/523140 https://doi.org/10.1071/MF15086 http://www.publish.csiro.au/paper/MF15086.htm http://www.publish.csiro.au/?act=view_file&file_id=MF15086.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000378929600015 volume:67 issue:7 firstpage:1023 lastpage:1036 numberofpages:14 journal:MARINE AND FRESHWATER RESEARCH http://hdl.handle.net/11585/523140 doi:10.1071/MF15086 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84975275194 http://www.publish.csiro.au/paper/MF15086.htm http://www.publish.csiro.au/?act=view_file&file_id=MF15086.pdf |
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_ |
1796314020033069056 |