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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on February 26, 2009
ICES Journal of Marine Science: Journal du Conseil 2009 66(4):772-777; doi:10.1093/icesjms/fsp034
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© 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

The vertical separation of fish in the aft end of a demersal trawl

Ludvig Ahm Krag, René Holst and Niels Madsen

DTU Aqua, National Institute of Aquatic Resources, North Sea Science Park, 9850 Hirtshals, Denmark

Correspondence to L. A. Krag: tel: +45 33 963200; fax: +45 33 963260; e-mail: lak{at}aqua.dtu.dk.

Krag, L. A., Holst, R., and Madsen, N. 2009. The vertical separation of fish in the aft end of a demersal trawl. – ICES Journal of Marine Science, 66: 772–777.

Two multi-compartment separator frames were used to study the vertical separation of some commercially important fish species in the aft end of a trawl, with the aim of separating cod (Gadus morhua) from other species. A non-linear multinomial model with random effects was used to analyse the data and to compare the performance of the two frames. The vertical distribution of cod in the aft end of the trawl was close to uniform, whereas haddock (Melanogrammus aeglefinus), whiting (Merlangius merlangus), plaice (Pleuronectes platessa), and lemon sole (Microstomus kitt) showed more uneven distributions. The use of guiding bars in the separator frame significantly (p < 0.05) increased the catch of cod, plaice, and lemon sole in the upper compartment. The vertical separation of cod was density-dependent; high densities of fish resulted in a more uniform distribution of cod. The species separations found differ from those reported from the studies of species separation in the region of the trawl mouth.

Keywords: cod, fish behaviour, multinomial mixed effects models, species selectivity, trawl

Received 3 November 2008; accepted 4 February 2009; advance access publication 26 February 2009.


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