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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on October 4, 2007
ICES Journal of Marine Science: Journal du Conseil 2007 64(9):1836-1844; doi:10.1093/icesjms/fsm150
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© 2007 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Escape mortality of cod, saithe, and haddock in a Barents Sea trawl fishery

Ólafur Arnar Ingólfsson1,, Aud Vold Soldal1, Irene Huse1 and Mike Breen2

1 Institute of Marine Research, PO Box 1870, Nordnes, 5817 Bergen, Norway
2 Fisheries Research Services, Marine Laboratory, PO Box 101, Aberdeen, UK

Correspondence to Ó. A. Ingólfsson: Present address: Marine Research Institute, Árnagata 2-4, 400 Ísafjördur, Iceland; tel: +354 575 2303; fax: +354 450 3005; e-mail: olafur{at}hafro.is

Ingólfsson, Ó. A., Soldal, A. V., Huse, I., and Breen, M. 2007. Escape mortality of cod, saithe, and haddock in a Barents Sea trawl fishery. – ICES Journal of Marine Science, 64: 000–000.

We investigated the survival of gadoid fish in the Barents Sea escaping from a demersal trawl during commercial fishing conditions, with and without a sorting grid, at high and low levels of fishing intensity. The mortality of cod and saithe was negligible and unrelated to experimental conditions. Haddock mortality was generally greater than observed in earlier experiments and inversely related to fish length. Any possible effects of experimental conditions were hidden by large variability in the observed rates of mortality. We conclude that the observed mortality of haddock is confounded by methodological problems, particularly the instability of the observation cages, and does not reflect the true escape mortality. Cod and saithe are capable of surviving the stress of passage through, and escape from, the trawl, whereas haddock are more vulnerable, despite being a closely related species.

Keywords: cod, codend, escape mortality, fishing intensity, haddock, saithe, Sort-V

Received 4 July 2007; accepted 30 August 2007; advance access publication 4 October 2007.


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