Reference : Brown trout fry move inshore at night: a choice of water depth or velocity?
Scientific journals : Article
Life sciences : Aquatic sciences & oceanology
http://hdl.handle.net/2268/14703
Brown trout fry move inshore at night: a choice of water depth or velocity?
English
Bardonnet, A. [> > > >]
Poncin, Pascal mailto [Université de Liège - ULg > > Biologie du comportement - Ethologie et psychologie animale >]
Roussel, J. M. [> > > >]
Sep-2006
Ecology of Freshwater Fish
Blackwell Publishing
15
3
309-314
Yes (verified by ORBi)
International
0906-6691
Oxford
[en] habitat ; Salmonidae ; young-of-the-year ; emergence ; predation risk
[en] The instream positions of brown trout fry differ between daylight and darkness. According to field and laboratory observations, recently emerged 0+ brown trout use shallow and slow-flowing areas close to the bank at night and tend to move off-shore during daylight. In laboratory channels, we tested whether the use of habitats close to the river bank could be attributed to a choice of either water depth or velocity. In two complementary experiments, emerging brown trout alevins were given the choice of using shallow-slow or deep-swift habitats (experiment 1), and deep-slow or shallow-swift habitats (experiment 2). At night, a persistent preference for the shallow habitats was displayed, regardless of velocity. It was concluded that swim-up brown trout fry respond to shallowness rather than ambient low water velocity when selecting habitats close to the bank at night. The behavioural significance of this result and implications for river management are discussed.
Researchers ; Professionals ; Students ; General public
http://hdl.handle.net/2268/14703

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