© 2004 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
Review of technological advances for the study of fish behaviour in relation to demersal fishing trawls
a Institute of Marine Research, Department of Marine Resources, Fish Capture Division PO Box 1870 Nordnes, NO-5817 Bergen, Norway
b FRS Marine Laboratory PO Box 101, Aberdeen AB9 11DB, Scotland, UK
*Correspondence to N. Graham: tel: +47 55 23 69 61; fax: +47 55 23 68 30. e-mail: norman.graham{at}imr.no; jonese{at}marlab.ac.uk; reiddg{at}marlab.ac.uk.
In demersal trawling, there is a need to develop more species-selective trawls to minimize discarding in multispecies fisheries. This requires observational tools that can operate at depths and light levels encountered by the commercial fleets. There is a growing tendency towards more fishery-independent stock-assessment methods using survey trawls to provide population indices. This requires the ability to quantify the herding and capture efficiency by species and age groups of such gears. A range of optical and acoustic observation techniques has been developed over the past few decades to assist in these goals. In this paper we update the review of technologies presented at the ICES Symposium on Fish Behaviour in Relation to Fishing Operations held in 1992. Since then, considerable advances in optical, acoustic, and data-processing technology have been made.
Keywords: behaviour, fishery acoustics, selectivity, survey trawls, trawl instrumentation
Received 27 March 2003; accepted 1 April 2004.
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