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JOURNAL OF PLANKTON RESEARCH | VOLUME 9 | NUMBER 1 | PAGES 125-137 | 1987
© Oxford University Press

research-article

An ecosystem model for the assessment of plankton production in relation to the survival of young fish

T.R. Parsons and T.A. Kessler

Department of Oceanography, The University of British Columbia Vancouver, British Columbia V6T 1W5

Received on February 1, 1986; accepted on September 1, 1986 A mixed upper layer ecosystem simulation model is used to assess the effect of changes in the zooplankton stock on young salmonid growth and survival. The effect of physical factors such as light extinction and mixed layer depth cause salmonid production to optimize at conditions which favour maximum zooplankton standing stock. However, the overwintering stock of ctenophores may decimate the zooplankton and cause a reduction in young salmonid growth and survival, particularly in unseasonally warm years. The standing stock of salmonids and the time of release have less effect on growth than either physical factors or ctenophores.


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