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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on June 14, 2009
ICES Journal of Marine Science: Journal du Conseil 2009 66(9):1985-1998; doi:10.1093/icesjms/fsp162
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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

Modelling the direct impact of bottom trawling on the North Sea fish community to derive estimates of fishing mortality for non-target fish species

G. J. Piet1, R. van Hal1 and S. P. R. Greenstreet2

1 Wageningen IMARES, PO Box 68, 1970 AB IJmuiden, The Netherlands
2 Marine Laboratory, PO Box 101, Victoria Road, Aberdeen AB11 9DB, UK

Correspondence to G. J. Piet: tel: +31 317 487188; fax: +31 317 487326; e-mail: gerjan.piet{at}wur.nl.

Piet, G. J., van Hal, R., and Greenstreet, S. P. R. 2009. Modelling the direct impact of bottom trawling on the North Sea fish community to derive estimates of fishing mortality for non-target fish species. – ICES Journal of Marine Science, 66: 1985–1998.

This study introduces a spatially explicit model that combines abundance data for all the main fish species in the demersal North Sea fish community with international effort data and estimates of gear-, species-, and size-dependent catch efficiency to determine the mortality of non-target fish species caused by bottom trawl fisheries and its spatial variation. Where necessary information was lacking, assumptions were made, and a sensitivity analysis performed to examine the impact of these issues on model results. Model outcomes were validated using international landings and discard data for five target species: cod, haddock, whiting, sole, and plaice. This showed that depending on its configuration, the model could reproduce recorded landings and discards of these species reasonably well. This suggests that the model could be used to simulate rates of fishing mortality for non-target fish species, for which few data are currently available. Sensitivity analyses revealed that model outcomes were most strongly influenced by the estimates of gear catch efficiency and the extent to which the distributions of fishing effort and each species overlapped. Better data for these processes would enhance the contribution that this type of model could make in supporting an ecosystem approach to fisheries management.

Keywords: catch efficiency, elasmobranchs, fishing effort, fishing impact, non-target species, spatial distribution

Received 5 November 2008; accepted 7 May 2009; advance access publication 14 June 2009.


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