Introduction of Atlantic salmon Salmo salar L. to the river Akerselv, Oslo

Abstract

In 1981 Carlintagged Atlantic salmon smolts from the river Imsa and river Sandvikselv stocks, and in 1984 smolts from the river Loneelv stock were released in the river Akerselv. The smolts left the river and the inner Oslofjord few weeks after release. Most adult recaptures were reported from the sea fisheries. Adults from the Imsa and Sandvikselv stocks were caught in more distant waters than fish from the Loneelv stock. The main reason for this is probably due to size selective fishery. Straying to neighbouring rivers in Oslojord was very common, especially for the smolts released in 1981. The Loneelv smolts released in 1984 gave the best adult return to the river Akerselv. It is concluded that smolt releases in the river Akerselv particularly of a grilse stock like that of the river Loneelv may be a useful way to develop a recreational fishery in the Oslofjord and the river Akerselv.

Keywords

• Actinopterygii
• Salmoniformes
• restocking
• population dynamic
• Southern Norway