By R. G. J. Shelton, A. D. F. Johnstone
Fisheries Research, Volume 24, Issue 1, July 1995, Pages 73-78, ISSN 0165-7836, DOI: 10.1016/0165-7836(94)00363-2.

Hatchery-reared and wild, North Esk salmon smolts were separately observed by closed circuit television after release into a sea-water enclosure. The hatchery-reared smolts were loosely aggregated from the beginning of the observation period. The wild smolts formed a compact school during the first 24/48 h of observation but, once accommodated to the aquarium environment, their behaviour became more like that of the hatchery fish. Smolts which escaped from the netting enclosure made determined efforts to rejoin the enclosed school.
Keywords: Salmo salar, Behaviour; School structure

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