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Tagging experiments on artificially reared 0-group coastal cod (Gadus morhua L.) in western Norway - results from the releases in 1984

Svåsand, Terje; Kristiansen, Tore S.; Næss, Harald
Working paper
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CM_1987_F_25.pdf (2.457Mb)
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http://hdl.handle.net/11250/104322
Utgivelsesdato
1987
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  • ICES CM documents authored by IMR scientists (1949-2011) [3139]
Originalversjon
This report is not to be cited without prior reference to the authors  
Sammendrag
In November - December 1984, 8,038 seven to eight month old pond or basin

reared cod fry were tagged and released in Heimarkspollen, a landlocked

fjord in western Norway. The aim of this study was to investigate whether

recapture rate (survival) was influenced by tagging method, release method or

size at release, and to study the growth pattern of the different size groups

after release. The juveniles were graded in four size groups and tagged with

either Internal Steal Tags or Floy Anchor Tags. The fry were released in

shallow nearshore waters one by one or in small groups. Tag return to 1 June 1987 from fishing surveys and recaptures reported by

local fishermen were 7.6 %. There were no significant differences in

percentage recaptured between cod tagged with Internal Steal Tags and Floy

Anchor Tags or between single and group released fry. The recapture rates

increased with increasing size at release, which indicated size dependent

mortality. There was a tendency of growth compensation in the smallest size

groups, and for recaptured cod older than two years there was no significant

difference in mean length at age between the size groups.
Utgiver
ICES
Serie
ICES CM Documents;1987/F:25

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