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Research article2010Peer reviewed

Size at hatching determines population dynamics and response to harvesting in cannibalistic fish

van Kooten, T; Andersson, J; Byström, Pär; Persson, L; De Roos, A M


We hypothesize that size at hatching strongly affects population dynamics of cannibalistic fish species and is a crucial determinant of how populations respond to selective removal of large individuals (harvesting). We use a mechanistic mathematical model to study the relation between hatching size and response to harvesting mortality, using Eurasian perch (Perca fluviatilis) as a model organism. We show how hatching size determines dynamics through its effect on the relative strength of cannibalistic mortality and resource competition as mechanisms of population regulation. In populations with intermediate and large hatching size, cannibalistic mortality is an important determinant of population dynamics. and harvesting destabilizes population dynamics. When hatching size is small, population stability is less sensitive to this type of harvesting. Populations hatching at small size are regulated by competition, and harvesting large individuals affects such populations less. Harvesting can also induce the growth of very large individuals, absent in unharvested populations. Our results show that harvesting in cannibalistic lake fish populations can strongly alter Population dynamics in ways that can only be anticipated on the basis of mechanistic knowledge about how populations are regulated.

Published in

Canadian Journal of Fisheries and Aquatic Sciences
2010, Volume: 67, number: 2, pages: 401-416 Publisher: NATL RESEARCH COUNCIL CANADA-N R C RESEARCH PRESS

      SLU Authors

    • Byström, Pär

      • Department of Aquaculture, Swedish University of Agricultural Sciences

    Sustainable Development Goals

    SDG14 Life below water

    UKÄ Subject classification

    Fish and Aquacultural Science
    Environmental Sciences related to Agriculture and Land-use

    Publication identifier


    Permanent link to this page (URI)