The smoltification conditions of salmon, the abundance of smolts and the dynamics of their descent in the Salaca River

Mitans, A.R.

The smoltification conditions of salmon, the abundance of smolts and the dynamics of their descent in the Salaca River | Условия смолтификации, динамика ската и численность покатников лосося р. Салацы

1967

Mitans, A.R.

The results of the investigations on the smoltification conditions of salmon Salmo salar and sea trout Salmo trutta and the dynamics of their natural descent to the Baltic sea are described. Also, some smolt's features were studied. Applying the method of tagging and recaptures, the total salmon stock at the age of 1-4 years in the Salaca River (Latvia) was estimated at about 8500 specimen in 1964 and 9600 individuals in 1965. Both in 1964 and 1965 the 2-year-old fish were in majority. The increase in their number in 1965 can be explained with better feeding conditions in the season before the descent to the sea, as well as with favourable smoltification and migration conditions.

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