Smolt age and size of Atlantic salmon Salmo salar L. and sea trout Salmo trutta L. in a Norwegian river

Smolt age and size of Atlantic salmon Salmo salar L. and sea trout Salmo trutta L. in a Norwegian river

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This paper gives data on smolt age and length of Atlantic salmon and sea trout in the Orkla river in the period 1979 - 1981.The smolt Above Ground Product (Ladders) age of the salmon was significantly higher in 1979 (4.1 years) as opposed to 3.4 and 3.

3 years in 1980 and 1981, respectively.However, the average length of the salmon smolts did not differ during the study period.Sea trout smolts showed a significantly lower average length in 1979 compared to that found in the two preceding years.No such difference Timing Belt could be detected in the smolt age which ranged between 3.

3 - 3.6 years during the study period.Smolts of both species showed a heterogeneous length distribution with a variation between 100 - 170 mm for salmon and 110 - 200 mm for sea trout.It is concluded that growth rate is more important than the mere attainment of a critical length for initiating smolt descent.