Journal Article

Analysis of juvenile North Atlantic albacore (<i>Thunnus alalunga</i>) catch per unit effort by surface gears in relation to environmental variables

Nicolas Goñi and Haritz Arrizabalaga

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 62, issue 7, pages 1475-1482
Published in print January 2005 | ISSN: 1054-3139
Published online January 2005 | e-ISSN: 1095-9289 | DOI: https://dx.doi.org/10.1016/j.icesjms.2005.05.014
Analysis of juvenile North Atlantic albacore (Thunnus alalunga) catch per unit effort by surface gears in relation to environmental variables

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The relationship between the catch per unit effort (cpue) of trolling and baitboat fisheries targeting juvenile North Atlantic albacore (Thunnus alalunga, Bonnaterre, 1788) and several environmental variables was studied. A multiple linear regression and a generalized least squares model (GLS) showed a significant negative relationship between age 2 albacore trolling and baitboat cpue, and the average agitation of the sea and the duration of insolation. No clear relationship was found between the juvenile albacore cpue and sea surface temperature, precipitation, and NAO or Gulf Stream Index. Underlying processes that could explain the negative effect of agitation and insolation are discussed, especially relating to the habitat of age 2 albacore above the seasonal thermocline. Results highlight the necessity of considering environmental variables in the standardization of albacore cpue series used for calibrating age-structured stock assessments.

Keywords: albacore; baitboat; cpue; juvenile; North Atlantic; thermocline; trolling

Journal Article.  4727 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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