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ICES Journal of Marine Science: Journal du Conseil 1997 54(2):273-275; doi:10.1006/jmsc.1996.0167
© 1997 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Bait defence behaviour of wolffish and its impact on long-line catch rates

Olav Rune Godø, Irene Huse and Kathrine Michalsen

Institute of Marine Research P.O. Box 1870, Nordnes, N-5024, Bergen, Norway. [Tel. (+47) 55 23 8500 Fax: fax. (+47) 55 23 8687, e-mail: n.n{at}imr.no].

During an acoustic tagging experiment on cod in the Barents Sea in March 1995 a hierarchy among fish species was revealed, in which a wolffish (Anarhichas sp.) was observed to be dominant in relation to cod and haddock. When wolffish are present in the odour field of a bait, the aggressive bait-defence behaviour of this species might reduce the hooking rate for other species. If long-line catch data are used for stock assessment purposes, the presence of wolffish might reduce the catchability coefficient (q) of other species, in this case cod and haddock.

Keywords: behaviour, competition, long-line

Received 7 March 1996; accepted 10 March 1996.


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