Effects of Density and Loading on Coho Salmon during Hatchery Rearing and after Release
- 1 July 1992
- journal article
- Published by American Fisheries Society in The Progressive Fish-Culturist
- Vol. 54 (3) , 137-147
- https://doi.org/10.1577/1548-8640(1992)054<0137:eodalo>2.3.co;2
Abstract
Two broods of coho salmon fingerlings (Oncorhynchus kisutch) were reared at three densities (25,000, 50,000, and 75,000 fish/raceway) and at three levels of water inflow (757, 1,514, and 2,271 L/min per raceway) at a year-round coldwater hatchery. All nine density–inflow combinations were tested (2 raceways/treatment). During the rearing phase of the study, various physiological and disease status indicators were tested for differences from rearing density (kg of fish/ m3 of rearing space) and loading (kg offish/[L of water flow-min]). After release from the hatchery, survival, adult contribution, and fishery catch data were also examined for treatment effects. Fingerlings reared at the lowest density were smaller at release than fish reared at the two higher densities. Gill ATPase at release was reduced in fish reared at the highest density and also in fish reared at the lowest water inflow rate. Increased rearing density produced small but significant reductions in percent survival of smolts af...Keywords
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