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Stream channel experiments on downstream movement of recently emerged trout, Salmo trutta L. and salmon, S. salar L.—I. Effect of four different water velocity treatments upon dispersal rate
Author(s) -
Crisp D. T.,
Hurley M. A.
Publication year - 1991
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.1095-8649.1991.tb04367.x
Subject(s) - salmo , biological dispersal , biology , trout , brown trout , fishery , salmonidae , ecology , zoology , fish <actinopterygii> , population , demography , sociology
Four experimental stream channels were used to study instantaneous downstream dispersal rates of young trout, Salmo trutta L., and salmon, S. salur L ., relative to four different water velocities. Young salmon showed a high rate of dispersal at a low velocity of 7.5 cm s −1 and lower rates at higher velocities of 25 to 70cm s −1 . Trout showed their lowest rate at 25cm s −1 with a slightly higher rate at 7.5 cm s −1 and increasingly higher rates at velocities in excess of 25 cm s −1 . These results are consistent with field observations on the velocity preferences of young trout and salmon.