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Rearing conditions and phenotypes of experimental fish in experiments I (a and c) and II (b and d). (a) Hatchery environment. (b) Simulated natural environment (these environments also were used during the predation experiments). (c) Phenotypes of fish reared in the hatchery environment. (d) Phenotypes of fish reared in the simulated natural environment or caught from nature (Chehalis River, British Columbia, Canada).
