期刊
JOURNAL OF FISH BIOLOGY
卷 93, 期 3, 页码 449-454出版社
WILEY
DOI: 10.1111/jfb.13657
关键词
foraging; hatchery; life history; Oncorhynchus mykiss; predator
资金
- U.S. Army Corps of Engineers, Portland District [TD-13-02, MIPR W66QKZ63007786]
- Fisheries and Wildlife Department of Oregon State University
- Oregon Department of Fish and Wildlife
- Oregon Hatchery Research Center
- United States Geological Survey
The relative movement of juvenile steelhead Oncorhynchus mykiss reared on two treatments was investigated to provide insight on the effect of structure in the rearing environment on the behaviour of the fish before potential release into a natural river system. The progeny of wild broodstock were reared either in the presence or absence of structure in the tank environment for 7 months at the Oregon Hatchery Research Center located in Oregon, U.S.A. Behavioural assessments, including movement response to a simulated predator, showed that fish reared on structure moved a similar amount (based on line crosses) as fish reared in bare hatchery tanks. No significant difference was observed in the proportion of time spent near a small structure within the behavioural test tank between the two treatments, but all fish showed decreased movement over time with each subsequent predation event. Fish from both treatments spent 30% of their time in the section of the tank containing the structure, which was one section out of a total of eight sections. In both treatments, fish foraged 20% of the time in the 2 min following the introduction of live tubifex prey (two separate events). Overall, similar movement and foraging responses occurred following mock predation events for juveniles reared either with or without structure. Developing assessment tools such as these, that measures behaviours related to survival based on rearing environment should allow managers to better predict the survival and effect of rearing conditions on the release of hatchery-origin fish into the wild.
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