Performance of wild rainbow trout (Oncorhynchus mykiss) from the Blackwater River and Tsuniah, Bootjack and Tzenzaicut Lakes (coarse fish lake strains) was compared to the Pennask Lake strain (monoculture) in eight study lakes having minnow and/or sucker populations. Two coarse fish lake strains and a control (Pennask) strain were stocked as yearlings in each study lake between mid-May and early June. Growth and relative survival of the strains were compared after a five-month growth period. At age 1+, Blackwater fish were significantly larger than Pennask fish in the four study lakes in which both were stocked. Tzenzaicut strain was significantly larger than Pennask strain fish in three of five study lakes. Tsuniah Lake rainbow trout strain were significantly heavier but not larger than Pennask strain fish in two of four lakes in which these strains were stocked. No significant size difference was found between Bootjack and Pennask fish in any of the four lakes in which both were stocked. Relative survival was significantly higher for rainbow trout strains orginating from a coarse fish lake than Pennask strain in five lakes, but was similar in three lakes. Evidence of fish consumption was found at age 1+ in all rainbow trout strains originating from coarse fish lakes. Fish were not found in guts of Pennask trout until age 2+.
Blann, Victoria E., Godin, Theresa I.; Tsumura, Kanji. 1990. Rainbow Trout Broodstocks for Coarse Fish Lakes: Habitat Conservation Fund Progress Report (1990-91). Ministry of Environment. Fisheries Project Report. RD24
Topic: Fish and Fish Habitats
Keywords: rainbow trout, growth, stocking, survival, food, broodstocks, coarse fish strains, Blackwater Risver, Tsuniah Lake, Bootjack Lake, Tzenzaicut Lake, Pennask Lake
Scientific Name: Oncorhynchus mykiss
English Name: Rainbow Trout
Other Identifier: FPR RD24
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