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Daytime Responses of Brown Trout (Salmo trutta) to Cover Stimuli in Stream Channels
Author(s) -
Devore Philip W.,
White Ray J.
Publication year - 1978
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1978)107<763:drobts>2.0.co;2
Subject(s) - brown trout , salmo , cover (algebra) , trout , channel (broadcasting) , fish <actinopterygii> , fishery , environmental science , biology , computer science , telecommunications , engineering , mechanical engineering
Experiments were conducted to identify stimuli to which stream‐dwelling brown trout responded in selecting concealment or “cover.” The trout were 25‐30 cm in total length. In each experiment, a group of five trout had choice of two types of cover in a channel 27 m long and 3.4 m wide with water 20‐30 cm deep, flowing 22‐37 cm/s. The fish preferred overhead cover 10 cm rather than 15 or 20 cm above streambed (P < 0.001), as well as cover with tactual features (P < 0.03). There was no apprent increased response to overhead cover that offered added visual reference features or lateral concealment.