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ICES Journal of Marine Science: Journal du Conseil 2000 57(3):689-696; doi:10.1006/jmsc.2000.0729
© 2000 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Gauging the impact of fishing mortality on non-target species

John G. Pope, Dave S. Macdonald, Niels Daan, John D. Reynolds and Simon Jennings

CEFAS Laboratory Pakefield Rd, South Lowestoft, Suffolk NR33 0HT, England, UK
NFH. Universitet i Tromsø Tromsø, Norway
School of Biological Sciences, University of East Anglia Norwich, NR4 7TJ, England, UK
RIVO PO Box 68, 1970 AB IJmuiden, The Netherlands

[tel: +44 1502 562244; fax: +44 1502 524511; e-mail: S.Jennings{at}cefas.co.uk]

[Correspondence to NRC (Europe) Ltd, The Old Rectory, Burgh St Peter, Norfolk NR34 0BT, England, UK]

The most obvious effect of fishing on non-target species is direct mortality. To quantify this effect on the vulnerability of species requires measurement of the current fishing mortality rate and of the tolerance of the species to fishing mortality. These are difficult to estimate for the little-studied non-target species. We describe two potential methods for estimating current fishing mortality rate when data are limited. Their application is illustrated for dab (Limanda limanda) and grey gurnard (Eutrigula gurnardus), two common non-target species in the North Sea. We also develop approaches to define tolerance levels for fishing mortality for little-studied and rare species, based on the potential jeopardy level: the fishing mortality that causes a reduction in spawning stock biomass per recruit relative to the unexploited situation. We propose that for non-target species, models founded on basic knowledge of life history parameters, and on generally established relationships between these parameters, may offer the only practical approach.

Keywords: conservation, ecosystem effects, fisheries, mortality, non-target species, stock assessment


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