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Predation rates by North Sea cod (Gadus morhua) - Predictions from models on gastric evacuation and bioenergetics

ICES Journal of Marine Science

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, , , , , and

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Abstract

We compared four different methods for estimating predation rates by North Sea cod (Gadus moi hua). Three estimates, based on gastric evacuation rates, came from an ICES multispecies working group and the fourth from a bioenergetics model. The bioenergetics model was developed from a review of literature on cod physiology. The three gastric evacuation rate models produced very different prey consumption estimates for small (<0.5 kg) and large (>2 kg) fish. For most size and age classes, the bioenergetics model predicted food consumption rates intermediate to those predicted by the gastric evacuation models. Using the standard ICES model and the average population abundance and age structure for 1974-1989, annual, prey consumption by the North Sea cod population (age greater than or equal to 1) was 840 kilotons. The other two evacuation rate models produced estimates of 1020 and 1640 kilotons, respectively. The bioenergetics model estimate was 1420 kilotons. The major differences between models were due to consumption rate estimates for younger age groups of cod. (C) 1996 International Council for the Exploration of the Sea

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Predation rates by North Sea cod (Gadus morhua) - Predictions from models on gastric evacuation and bioenergetics
Series title:
ICES Journal of Marine Science
Volume
53
Issue:
1
Year Published:
1996
Language:
English
Contributing office(s):
Upper Midwest Environmental Sciences Center
Description:
pp. 107-114
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
ICES Journal of Marine Science
First page:
107
Last page:
114