HABITAT UTILIZATION OF JUVENILE ATLANTIC SALMON (SALMO-SALAR L), BROWN TROUT (SALMO-TRUTTA L) AND ARCTIC CHARR (SALVELINUS-ALPINUS (L)) IN 2 LAKES IN NORTHERN NORWAY
M. Halvorsen et al., HABITAT UTILIZATION OF JUVENILE ATLANTIC SALMON (SALMO-SALAR L), BROWN TROUT (SALMO-TRUTTA L) AND ARCTIC CHARR (SALVELINUS-ALPINUS (L)) IN 2 LAKES IN NORTHERN NORWAY, Ecology of freshwater fish, 6(2), 1997, pp. 67-77
Habitat utilization of juvenile Atlantic salmon, brown trout and Arcti
c charr was investigated in two lakes in northern Norway during the ic
e-free season. Both the vertical distribution and the distribution amo
ng different habitat types were studied by gillnetting with small mesh
sized gillnets (8-15 mm) in different habitats. Salmon and trout were
predominantly caught in the littoral and sublittoral zones (0-6 m dep
th). Access to shelter seemed to be the most important factor determin
ing the horizontal distribution of small salmon and trout. Most of the
se fish were caught in stony or vegetated habitats, while few salmon a
nd trout were caught on sandy locations or in the pelagic zone. In one
of the lakes, there were significantly higher catch races of salmon t
han of trout in the stony littoral (0-3 m), while in the other lake th
ere were no significant differences in spatial distribution between th
ese two species. Charr were primarily found in the profundal, sublitto
ral or pelagic zones of the lakes.