Effect of Stocking Season and Technique on Survival of Lake Trout in Lake Ontario
- 1 February 1992
- journal article
- Published by Oxford University Press (OUP) in North American Journal of Fisheries Management
- Vol. 12 (1) , 131-138
- https://doi.org/10.1577/1548-8675(1992)012<0131:eossat>2.3.co;2
Abstract
To identify the stocking season and technique that resulted in maximum contribution of hatchery-reared lake trout Salvelinus namaycush to the population in Lake Ontario, paired lots of yearlings were stocked near shore in March, near shore in May, and offshore by helicopter in May. All mortality associated with stocking season and technique apparently had occurred by age 2. Therefore, survival comparisons were based on combined recoveries of age-2 and older fish. We found statistically significant differences in survival ratios for 19 of 30 comparisons among individual paired lots, but results were not consistent. For example, among 17 comparisons of lake trout stocked near shore in May and offshore in May, survival was significantly better for fish stocked near shore in four cases and for fish stocked offshore in six cases. With fish stocked near shore in May used as the control group, mean survival ratios (near shore March : near shore May : offshore May) were 0.86:1.00:1.12. However, the 95% c...Keywords
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