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The migration of coastal cod (Gadus morhua L.) tagged in a fjord of western Norway

Nordeide, Jarle Tryti; Salvanes, Anne Gro Vea
Working paper
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CM_1988_G_5.pdf (700.9Kb)
URI
http://hdl.handle.net/11250/104505
Date
1988
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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
This study is part of a research program investigating the possibility of enhancing

the production of coastal cod via a large scale release of pond produced fish in

Masfjorden, a fjord of western Norway. An analysis of parts of the ecosystem are

being carried out prior to the large scale experiment with a special focus on the cod

population of the fjord. The paper deals with the migration pattern of wild cod which

were caught, tagged and recaptured and also, pond produced cod released in small scale

tag-release-recapture experiments. We applied Spearman's rank correlation test and

Kolmogrov-Smirnov two-sample test to assess whether larger individuals migrate longer

distances than smaller cod. The major proportion of the immature wild and pond produced cod were nearly stationary

and only 15.0 and 7.0 percent, respectively were recaptured more than five kilometers

from the release site. However, a larger proportion, 54 percent, of mature cod were

recaptured outside the release site, of which the !argest individuals were found to

migrate the longest distances, with some of the latter intermingling with cod from

contiguous fjords.
Publisher
ICES
Series
ICES CM Documents;1988/G:5

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