Abstract
In aquarium experiments using coho salmon as a model species, prior residents dominated intruders of the same size but intruders with a 6% length advantage were equally matched against prior residents. Prior winning experience (distinct from individual recognition) also strongly influenced competitive success and overcame a prior residence effect. Coho salmon reared in a hatchery dominated size-matched fish from the same parental population reared in a stream. Hatchery-reared salmon also dominated naturally spawned salmon, even when the wild salmon were prior residents. Thus the combined effects of greater size and rearing experience of hatchery-produced salmon were sufficient to overcome a wild salmon's advantage of prior residence. Efforts to rehabilitate salmonid populations must consider such behavioural interactions if displacement of wild fish is to be prevented.
Original language | English (US) |
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Pages (from-to) | 1220-1230 |
Number of pages | 11 |
Journal | Journal of Fish Biology |
Volume | 53 |
Issue number | 6 |
DOIs | |
State | Published - Dec 1998 |
Externally published | Yes |
Keywords
- Coho salmon
- Competition
- Experience
- Hatchery
- Prior residence
- Size asymmetry
ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics
- Aquatic Science