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Cannibalism as a factor regulating year class strength in the Norwegian spring-spawning herring stock

Holst, Jens Christian
Working paper
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CM_1992_H_14.pdf (1.885Mb)
URI
http://hdl.handle.net/11250/104964
Date
1992
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  • ICES CM documents authored by IMR scientists (1949-2011) [3139]
Original version
This report is not to be cited without prior reference to the author  
Abstract
The feeding area of the Norwegian spring-spawning herring

stock is at present situated in the north-eastern parts of the

Norwegian Sea. The eastern parts of the feeding area overlaps

with the distribution of drifting larvae and 0-group of the

same stock. This study presents preliminary results of a

stomach sampling program on adult herring feeding off

Vesterålen, confirming that cannibalism are taking place in

the area. The size range of the cannibals was 24 to 36 cm, and

the mean size of the 0-group eaten was 6 cm (range 4-8). The

maximum number of 0-group found in one stomach was 7. These

findings support the hypothesis that cannibalism may be a

regulating factor for yearclass strength in Norwegian springspawning

herring under the present migratory regime.
Publisher
ICES
Series
ICES CM Documents;1992/H:14

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