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A tagging and release experiment of 2-group artificially reared coastal cod (Gadus morhua). In: Flødevigen rapportserie no 1, 1990

Moksness, Erlend
Research report
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URI
http://hdl.handle.net/11250/115168
Date
1990
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  • Flødevigens rapportserie (1982-1992) [67]
Abstract
Cod were raised in an outdoor enclosure for the first 3 months after

hatching and then transferred to the laboratory. After 2 years and at a

length range from 33 to 52 cm (0.3 kg to 1.3 kg), 68 cod were tagged

and released in the Flødevigen Bay area. Of these cod, 29% were reported

recaptured and most of these (65%) were fished not more than 5 km

from the place of release. The results indicated that the fish disperse

quickly within the area after release, with one moving about 5 km within

one day. The fish dispersed in both directions along the coast, moving a

maximum of 30 km in each direction. Of the fish recaptured. 50% were

reported within 30 days and 75% within 100 days. No recapture was

reported later than 16 months after the release. Released cod tend to

migrate little, aithough these cod (33-52 cm) dispersed over a wider area

than did smailer cod (7- 17 cm) in previous release experiments in the

same area. The recapture rate indicates that releasing artificially reared

cod for later harvesting of market size cod (minimum 1.5 kg), will not be

economically profitable.
Publisher
Havforskningsinstituttet
Series
Flødevigen rapportserie
1, 1990

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