Optical complexity of habitat and social interactions in juvenile Atlantic salmon (Salmo salar.)
1995
Mikheev, V.N.
A hypothesis that in initial period of forming the individual territory in 0+juvenile Atlantic salmon the easily distinctive elements of the environment structure are of great importance. In the optically heterogeneous habitat, which was created by alteration of light and dark stripes in the bottom of a running-water tank, the distance between individuals increased and was accompanied by raising aggression in them. Over heterogeneous dark or light parts of the bottom fishes kept close to each other, frequency of antagonistic interactions was low enough. In free selection the fishes preferred the nonuniformly coloured part of the tank, even with colour was black. Functionally optic heterogeneity is twofold: provides fish with fixed in the space landmarks and gives it shelters. Shoals are characteristic of fishes under uniform conditions
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