River bed construction impact and habitat restoration for juvenile atlantic salmon salmo salar l. and brown trout salmo trutta l
Hvidsten, N.A.; Johnsen, B.O.
Aquaculture and Fisheries Management 23(4): 489-498
1992
DOI: 10.1111/j.1365-2109.1992.tb00792.x
Accession: 007760793
The River Soya, Norway, was canalized for agricultural purposes. In order to compensate for damage to the Atlantic salmon, Salmo salar L. and brown trout, Salmo trutta L. populations, different weirs were built. The aims of this study were firstly to analyze the effects of weirs covering the river bank and entire river bottom with blasted stones and secondly, to analyze the effects of sediments transported by freshets on the downstream salmon and trout populations after canalization. Restoration of the river bottom with blasted stones provided salmon with more substrate spaces. Densities of trout increased after the river bank was covered with stones. Sediments transported downstream from the canalized river stretch decreased the densities of juvenile salmon and trout.
