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ICES Journal of Marine Science: Journal du Conseil Advance Access published online on November 2, 2007
ICES Journal of Marine Science: Journal du Conseil, doi:10.1093/icesjms/fsm157
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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

Contribution of different spawning components to the mixed stock fishery for cod in Icelandic waters

Ingibjörg G. Jónsdóttir1,, Gudrun Marteinsdottir1 and Steven E. Campana2

1 Institute of Biology, University of Iceland, Sturlugata 7, 101 Reykjavík, Iceland, and Marine Research Institute, Skúlagata 4, PO Box 1390, 121 Reykjavík, Iceland
2 Bedford Institute of Oceanography, Population Ecology Division, PO Box 1006, Dartmouth, NS B2Y 4A2, Canada

Correspondence to I. G. Jónsdóttir: tel: +354 5752000; fax: +354 5752001; e-mail: ingibj{at}hafro.is

Jónsdóttir, I. G., Marteinsdottir, G., and Campana, S. E. 2007. Contribution of different spawning components to the mixed stock fishery for cod in Icelandic waters. – ICES Journal of Marine Science, 64: 000–000.

Otolith chemistry and length-at-age were used to estimate the contribution of different spawning components to the harvested stock of cod (Gadus morhua) at two of their main feeding grounds northwest and east of Iceland. Spawning cod were sampled at different spawning locations around Iceland in spring of 2002 and 2003. Significant differences were detected between cod from the different spawning locations. Cod of unknown stock origin were also sampled at two of the main feeding grounds in October of the same years. Analyses based on maximum likelihood were used to estimate the proportion of each spawning group in the mixed stock catches using otolith chemistry and fish length-at-age. Attempts to use otolith shape to estimate the contribution of the spawning groups to the mixed harvested stock were, however, unsuccessful. The results indicated that spawning locations northwest and north of Iceland, as well as in water deeper than 125 m south of Iceland, contributed the most to the harvested stock. Cod spawning shallower than 125 m south of Iceland did not contribute to the feeding grounds in October of 2002 and 2003. Therefore, exploitation of the feeding stock mixtures seems to be based on spawning components that have previously been considered to be of minor importance to the Icelandic cod stock.

Keywords: cod, Gadus morhua, migration, mixed stock analysis, otolith chemistry

Received 31 January 2007; accepted 29 September 2007.


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