Modelling the response of size and diversity spectra of fish assemblages to changes in exploitation

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Abstract

In this paper we investigate whether single and multispecies fisheries models call be used to predict the response of sire and diversity spectra of fish assemblages to changes in exploitation. Both types of models estimate that the slope of the size spectrum will steepen and the intercept will increase when fishing intensity increases, while the response of the slope and intercept of the diversity spectrum depend on the model used. The changes in the slope and intercept of the size spectrum are found to be proportional to the change in fishing intensity. The proportionality is insensitive to changes in natural mortality, but sensitive to changes in growth and to the relationship between stock and recruitment. The results agree will with results obtained from previous analysis of survey data from the North Sea and suggest that the slope of the size spectrum is a useful measure of fishing impacts. (C) 1998 International Council for the Exploration of the Sea.
Original languageEnglish
JournalICES Journal of Marine Science
Volume55
Issue number3
Pages (from-to)362-370
ISSN1054-3139
DOIs
Publication statusPublished - 1998

Bibliographical note

J English Article JUN 101KH Gislason H Univ Copenhagen, Danish Inst Fisheries Res, Charlottenlund Slot, DK-2920 Charlottenlund, Denmark ICES J MAR SCI

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