An Evaluation of the Potential for Training Trout in Hatcheries to Increase Poststocking Survival in Streams
- 1 February 1993
- journal article
- Published by Oxford University Press (OUP) in North American Journal of Fisheries Management
- Vol. 13 (1) , 171-177
- https://doi.org/10.1577/1548-8675(1993)013<0171:aeotpf>2.3.co;2
Abstract
An average of 8.9 million trout (Oncorhynchus spp., Salmo trutta, Salvelinus spp.) were planted in Wyoming each year from 1987 through 1990; 86% were of subcatchable size (<8.25 in) and 14% were of catchable size (≥8.25 in). Of the total fish planted, 1.9 million subcatchable trout and 177,000 catchable trout were planted in streams. Harvest rates of trout stocked in streams was low (average, 5.7%), possibly because of the hatchery conditions under which they were reared. Hatchery-reared trout were raised in conditions far different from those of natural waters: densities hundreds of times those in the wild, nearly constant water flow and water temperature, regular feeding, lack of cover, and absence of predators. Hatchery trout may become disoriented, fail to seek cover, forage inefficiently, and die when planted in streams with competing fish. Evaluating the survival of hatchery trout fed natural food, rearing hatchery trout in simulated natural conditions, raising them at moderate densities, a...Keywords
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