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The consumption rate of northeast Arctic cod - A comparison of gastric evacuation models

Bogstad, Bjarte; Mehl, Sigbjørn
Working paper
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CM_1990_G_22.pdf (1.984Mb)
URI
http://hdl.handle.net/11250/104769
Date
1990
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  • ICES CM documents authored by IMR scientists (1949-2011) [3138]
Original version
This report is not to be cited without prior reference to the authors  
Abstract
The consumption rates in fish are important but also often weak points

in multispecies models. In the Barents Sea multispecies model

(MULTSPEC), as in many other models, quantitative stomach content data

are combined with gastric evacuation data or models to produce

consumption rates of important prey species. To evaluate the

evacuation model presently used for cod in the Barents Sea and the

derived consumption rates, we have combined stomach data from 1984

with five other evacuation models for cod. The results are compared

and judged against data on prey stock sizes, individual cod growth,

daily rations and food conversion efficiency. The rations derived from

the different models ranged from 0.5 to 1.2% of the BW daily on

average for all agegroups of cod or from 2.1 to 4.4 times the biomass

of the total cod stock annually. Food conversion efficiency varied

between 6 and 59% for the different models and agegroups.
Publisher
ICES
Series
ICES CM Documents;1990/G:22

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