Summary
Preference behaviour patterns of wild brown trout (Salmo trutta L.) towards odours in their home-stream water were measured in laboratory experiments. Stream-dwelling, sexually mature trout were captured by electrofishing in different sections of a stream, transferred to a hatchery, and exposed to water sampled from various stream sections and to neutral water, scented by fish captured in the same stream sections. The fish preferred stream water originating from their home stream over that from a neighboring stream. Among water samples from their home stream, they preferred water from the home sections over water from distant sections both upstream and downstream. In most cases they also preferred neutral water scented by other mature fish captured in their home section over water scented by fish from the distant sections. Trout from two neighboring stream sections showed indifferent responses towards water and fish from the adjacent section. The attractive properties of stream water sampled from home sections coincided with those obtained with neutral water scented by fish from the same sites. Accordingly, the attractive components in stream water may be intraspecific odours derived from separate spawning demes of fish present in local areas of the stream.
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Arnesen, A.M., Stabell, O.B. Behaviour of stream-dwelling brown trout towards odours present in home stream water. Chemoecology 3, 94–100 (1992). https://doi.org/10.1007/BF01245887
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DOI: https://doi.org/10.1007/BF01245887