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Food and feeding ecology of juvenile albacore, Thunnus alalunga, off the Bay of Biscay: a case study

Identifieur interne : 000877 ( Main/Exploration ); précédent : 000876; suivant : 000878

Food and feeding ecology of juvenile albacore, Thunnus alalunga, off the Bay of Biscay: a case study

Auteurs : C. Pusineri [France] ; Y. Vasseur [France] ; S. Hassani [France] ; L. Meynier [France] ; J. Spitz [France] ; V. Ridoux [France]

Source :

ICES Journal of Marine Science [ 1054-3139 ] ; 2005.

RBID : ISTEX:11ADD27378E43ABE2C4C35025F063D97254AC720

Abstract

Although immature albacore tuna, Thunnus alalunga, are of economic and social importance in the Bay of Biscay, little is known about their diet and feeding ecology there. For this study, the diet of 78 albacore caught in the French driftnet fishery during summer 1993 is analysed. Fish dominated the diet in terms of relative abundance (86%N), and reconstituted mass (60%M), the most important being Maurolicus muelleri (79%N, 23%M), Scomberesox saurus (2%N, 30%M), and Arctozenus risso (4%N, 4%M). Crustaceans were also important in the diet (12%N, 2%M), but given their small size, it is questionable whether they were primary or secondary prey. Foraging on cephalopods seemingly took place only occasionally: they represented 2%N and 39%M of the total diet, but were absent from the fresh fraction of stomach contents. Prey sizes ranged from 6 to 228 mm. Juvenile albacore consume either epipelagic prey by day, or vertically migrating mesopelagic species that reach the surface layer by night.

Url:

https://api.istex.fr/document/11ADD27378E43ABE2C4C35025F063D97254AC720/fulltext/pdf

DOI: 10.1016/j.icesjms.2004.09.004

Affiliations:

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Le document en format XML

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<front><div type="abstract">Although immature albacore tuna, Thunnus alalunga, are of economic and social importance in the Bay of Biscay, little is known about their diet and feeding ecology there. For this study, the diet of 78 albacore caught in the French driftnet fishery during summer 1993 is analysed. Fish dominated the diet in terms of relative abundance (86%N), and reconstituted mass (60%M), the most important being Maurolicus muelleri (79%N, 23%M), Scomberesox saurus (2%N, 30%M), and Arctozenus risso (4%N, 4%M). Crustaceans were also important in the diet (12%N, 2%M), but given their small size, it is questionable whether they were primary or secondary prey. Foraging on cephalopods seemingly took place only occasionally: they represented 2%N and 39%M of the total diet, but were absent from the fresh fraction of stomach contents. Prey sizes ranged from 6 to 228 mm. Juvenile albacore consume either epipelagic prey by day, or vertically migrating mesopelagic species that reach the surface layer by night.</div>
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Food and feeding ecology of juvenile albacore, Thunnus alalunga, off the Bay of Biscay: a case study

Food and feeding ecology of juvenile albacore, Thunnus alalunga, off the Bay of Biscay: a case study

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Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

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