A release of 16.741 underyearlings of Atlantic salmon Salmo salar in Lake Storevatnet in the River Imsa system resulted in a downstream migration of 1.580 smolts. Most of the smolts were 2 years of age, but there was also a significant proportion of one year old smolts. Growth of the lake reared smolts was excellent, but they migrated downstream over a much longer period than naturally produced smolts which descended mainly in May. In total 0,7% of Carlin-tagged lake reared smolts were recaptured as adults compared with 15,4% of the naturally produced smolts. It is suggested that the low survival of lake reared smolts is mainly due to their irregular migration time.
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Lars P. Hansen (1987) studied this question.