The effect of anosmia on the migration of Atlantic salmon smolts (Salmo salar L.) in freshwater |
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| Authors: | Kjell B Døving Bror Jonsson Lars P Hansen |
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| Institution: | 1. Department of Zoophysiology, University of Oslo, P.O. Box 1051, Blindern, N-Oslo 3 Norway;2. Directorate for Wildlife and Freshwater Fish, Research Station for Freshwater Fish, Ims, N-4300 Sandnes Norway;3. Directorate for Wildlife and Freshwater Fish, Fish Research Division, N-1432 Ås-NLH Norway |
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| Abstract: | Wild and hatchery-reared salmon smolts of the Imsa strain were divided into two groups. One group was made anosmic by cutting the olfactory nerves, the other served as control. The smolts were released at three different sites in the Ims-Lutsi watercourse and recaptured in a fish trap at 100 m above the river estuary. The recapture rates in the trap decreased with increasing migratory distance for the smolts. The experiment indicates that the olfactory sense is not essential for smolt navigation through rivers and lakes. |
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