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ICES Journal of Marine Science: Journal du Conseil 2008 65(2):267-275; doi:10.1093/icesjms/fsn016
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Crown Copyright © 2008. Published by Oxford Journals on behalf of the International Council for the Exploration of the Sea. All rights reserved

Evaluating the efficacy of technical measures: a case study of selection device legislation in the UK Crangon crangon (brown shrimp) fishery

Tom L. Catchpole1,, Andrew S. Revill1, James Innes2 and Sean Pascoe3

1 Cefas, Pakefield Road, Lowestoft NR33 0HT, UK
2 University of Portsmouth, Burnaby Terrace, 1–8 Burnaby Road, Portsmouth PO1 3AE, UK
3 CSIRO, Marine and Atmospheric Research, 233 Middle Street, Cleveland 4163, Australia

Correspondence to T. L. Catchpole: tel: +44 1502 562244; fax: +44 1502 513865; e-mail: thomas.catchpole{at}cefas.co.uk

Catchpole, T. L., Revill, A. S., Innes, J., and Pascoe, S. 2008. Evaluating the efficacy of technical measures: a case study of selection device legislation in the UK Crangon crangon (brown shrimp) fishery. – ICES Journal of Marine Science, 65: 267–275.

Bycatch reduction devices are being introduced into a wide range of fisheries, with shrimp and prawn fisheries particularly targeted owing to the heavy discarding common in these fisheries. Although studies are often undertaken to estimate the impact of a technical measure on the fishery before implementation, rarely have the impacts been assessed ex post. Here, the efficacy of the UK legislation pertaining to the use of sievenets in the North Sea Crangon crangon fishery is assessed. Three impacts were evaluated: on fisher behaviour (social), on the level of bycatch (biological), and on vessel profitability (economic). An apparent high level of compliance by skippers was identified despite a low level of enforcement. The estimated reduction in fleet productivity following the introduction of the legislation was 14%, equalling the mean loss of Crangon landings when using sievenets calculated from catch comparison trawls. Sievenets did reduce the unnecessary capture of unwanted marine organisms, but were least effective at reducing 0-group plaice, which make up the largest component of the bycatch. Clearly the legislation has had an effect in the desired direction, but it does not address sufficiently the bycatch issue in the Crangon fishery.

Keywords: catch comparison, fisher behaviour, North Sea, Pleuronectes platessa, productivity, profitability

Received 1 June 2007; accepted 23 January 2008.


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