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Use of visual landmarks by young trout ( Salmo trutta ) during their diel downstream post‐emergence displacement in experimental channels
Author(s) -
Bardonnet A.
Publication year - 1993
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1993.tb00572.x
Subject(s) - salmo , diel vertical migration , brown trout , biology , daylight , fishery , trout , salmonidae , darkness , zoology , fish <actinopterygii> , optics , physics , botany
The diel timing of displacement of emerging brown trout ( Salmo trutta ) was studied by trapping the alevins at the downstream end of three experimental channels. The presence of phosphorescent landmarks on the substrate delayed the catches during the first hours of complete darkness, but increased them during twilight. During daylight, the presence of the landmarks was associated with greatly increased numbers of free‐swimming fishes.