Tagging and release experiments on 0-group coastal cod (Gadus morhua L.) reared in an outdoor basin

Juvenile coastal cod (Gadus morhua L.), hatched in the laboratory and reared in a large outdoor basin at Flødevigen Biological Station, were tagged and released in coastal waters in southern Norway. They were released at an age of 6 months and a length of about 10 cm. Tag return to 1 January 1980 was about 4% of the 712 cod released in 1976 and 10% of the 371 released in 1976 and 10% of the 371 released in 1977. About 90% of the cod were caught by anglers, in the area of release. The tagged cod showed t h e same growth rate as wild cod in the same area. The relatively high percentage recapture of cod released in 1977 might indicate a potential high survival rate of released cod reared in large basins