EFFECTS OF TEMPERATURE ON THE RESPONSES OF YOUNG SALMON TO WATER CURRENTS by MILES H. A. KEENLEYSIDE and WILLIAM S. HOAR (Department of Zoology, University of British Columbia, Vancouver, Canada 1) (With 3 figs.) (Ree. 16-III-1954) INTRODUCTION Orientation with respect to water currents is termed rheotaxis and swim- ming against the current is positive rheotaxis. In fish, this response is dependent on visual, tactile, and labyrinthine reflexes (GRAY, 1937; LYON, 1905). It is not expected to occur when fish cannot see or feel the bottom or experience turbulent and rotational currents which develop where water moves over irregular surfaces. However, even in shallow water, where a measure of contact with the bottom occurs, fish are not infrequently seen swimming with the current (negative rheotaxis) or failing to show any orientation with respect to the flow. When a fish is long exposed to current, failure of positive rheotaxis might be expected as a result of fatigue or adaptation of sensory mechanisms. However, negative rheotaxis, or oriented swimming with the current, is a different matter. There do not seem to be any clear descriptions of reversal of rheotaxis or valid demonstrations of factors which will cause a fish to swim
Behaviour – Brill
Published: Jan 1, 1955
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