Please use this identifier to cite or link to this item: http://dspace.azti.es/handle/24689/1261
Files in This Item:
There are no files associated with this item.
Title: Atlantic bluefin tuna (Thunnus thynnus) in Greenland - mixed-stock origin, diet, hydrographic conditions, and repeated catches in this new fringe area
Authors: Jansen, Teunis; Nielsen, Einar Eg; Rodriguez-Ezpeleta, Naiara and Arrizabalaga, Haritz; Post, Soren; MacKenzie, Brian R.
Citation: CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES, 2021, 78, 400-408
Abstract: Based on collaboration with the Greenlandic fishing fleet, we document the presence of Atlantic bluefin tuna (Thunnus thynnus) in most years from 2012 to 2018 in the waters east of Greenland (northern Irminger Sea). In total, 84 individuals have been registered as bycatch in the commercial fisheries in Greenland waters, which indicates that the first catch of three individuals in 2012 was not a single extreme observation, but that East Greenland waters have become a new outer limit of an expanded tuna habitat. Genetic analyses indicate that specimens from this region are mostly of Mediterranean origin with a small proportion originating from the Gulf of Mexico stock. Stomach content analysis suggests that the main prey is Atlantic mackerel (Scomber scombrus). The tunas ranged in size from 140 to 270 cm, corresponding to an estimated age range of 5-16 years; most were probably mature. The wide size-age range suggests that many year classes are participating in the migration to this region. Sea temperatures during summer have been above the long-term average in recent years of interest. Summer residence of bluefin tuna in the region could be due to a combination of increasing temperatures and higher overall abundances of both bluefin tuna and a key prey species (Atlantic mackerel).
Keywords: MACKEREL SCOMBER-SCOMBRUS; POPULATION-STRUCTURE; THERMAL BIOLOGY; BEHAVIOR; DRIVEN; GULF
Issue Date: 2021
Publisher: CANADIAN SCIENCE PUBLISHING
Type: Article
Language: 
DOI: 10.1139/cjfas-2020-0156
URI: http://dspace.azti.es/handle/24689/1261
ISSN: 0706-652X
E-ISSN: 1205-7533
Funder: Government of Greenland
Nordic Council of Ministers AG-Fisk [180-(2018)]
Department of Environment, Planning, Agriculture and Fisheries of the Basque Government under the project GENPES
Appears in Publication types:Artículos científicos



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.