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Growth and relative survival rates of age 1+ progeny of wild rainbow trout from Blackwater River, and Tsuniah, Bootjack and Tzenzaicut lakes, broodstocks (coarse fish trout strains) were compared to progeny from Pennask Lake monoculture broodfish in eight study lakes having minnow and/or sucker populations. Two coarse fish rainbow trout strains and the Pennask strain (control) were stocked as yearlings in each study lake between mid-May and early June and sampled after a five month period.
Age 1+ Blackwater fish weighed significantly more in October than Pennask fish in all four lakes where both strains were stocked. Blackwater fish were also greater in fork length in three of the lakes and similar in length in one lake. Tsuniah fish were significantly heavier than the Pennask strain in two of three lakes and similar to the Pennask fish in one lake. Tsuniah fish were similar in fork length to Pennask fish in all three lakes in which these strains were stocked. Bootjack fish were greater in weight than the Pennask fish in one of four lakes stocked and similar in weight in three lakes. Similarly, Bootjack fish were significantly greater in fork length than Pennask fish in only one of the four lakes. Tzenzaicut fish were greater in weight and in fork length than the Pennask fish in three of five lakes and similar in two lakes.
Relative survival to age 1+ compared to Pennask was significantly higher for the Tzenzaicut strain in five out of five lakes and two out of four lakes for the Bootjack strain. Blackwater and Tsuniah fish were always recovered in significantly lower numbers than the Pennask strain.
Evidence of fish consumption was found at age 1+ through age 2+ in all the strains originating from coarse fish lakes but only at age 3 in the Pennask strain. Approximately 2% and 5% of the Tzenzaicut and Bootjack fish sampled had fish in their guts at age 1+ while 4% of the Tzenzaicut, 9% of the Blackwater and 11% of the Bootjack fish sampled ...
Godin, Theresa I., Tsumura, Kanji. 1992. Rainbow Trout Broodstocks for Coarse Fish Lakes: Habitat Conservation Fund Progress Report (1991-92). Ministry of Environment, Lands and Parks. Fisheries Project Report. RD 30
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