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 |
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| Authors: | D. T. Crisp, M. A. Hurley,&dagger |
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| Affiliation: | The NERC Institute of Freshwater Ecology, Teesdale Laboratory, c/o Northumbrian Water, Lartington Treatment Plant, Lartington, Barnard Castle, Co. Durham DLl2 9D W;The NERC Institute of Freshwater Ecology, Windermere Laboratory, Far Sawrey. Ambleside, Cumbria LA22 OLP, U.K. |
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| Abstract: | 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. |
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| Keywords: | channel experiments Sulmo trutta S. salar water velocity dispersal rate |
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