Sight or smell? Behavioural and heart rate responses in subordinate rainbow trout exposed to cues from dominant fish

PeerJ
Johan HöjesjöJörgen I Johnsson

Abstract

Many animals, including fish, can utilize both vision and the chemical senses in intra-specific communication. However, the relative influence of these sensory modalities on behavioral and physiological responses in social interactions is not well understood. The aim of this study was therefore to investigate the relative effects of visual and chemical stimuli from dominant individuals on the behavioral and physiological responses of subordinate rainbow trout (Oncorhynchus mykiss). External electrodes were used to detect ECG signals from free-swimming fish. This method allowed the simultaneous recording of behavioral and physiological responses, and possible sex differences in these responses were also investigated. The results suggest that, in this context, visual cues are more important than chemical cues in settling the social hierarchy in rainbow trout because a combination of chemical and visual exposure generally yielded a response in focal fish that was similar to the response elicited by visual exposure alone. Both activity and physiological responses were most pronounced during the first ten seconds after exposure, with subordinate fish moving closer to the dominant, accompanied by a strong bradycardic response. Furthe...Continue Reading

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Citations

Apr 12, 2019·Behavioral Ecology : Official Journal of the International Society for Behavioral Ecology·Michelle E St JohnChristopher H Martin
Jun 29, 2021·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Claudia A F Wascher

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