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Growth and relative survival of progeny developed from rainbow trout brood fish inhabiting coarse fish environments and progeny from rainbow trout brood fish from a monoculture lake were compared in coarsefish lakes. The study was conducted using Blackwater River and Tsuniah, Bootjack and Tzenzaicut lakes strains (coarsefish trout strains) and the Pennask Lake strain (monoculture strain) in lakes with one or more coarse fish species. Coarse fish species included coarsescale sucker, longnose sucker, redside shiner, peamouth chub, and northern squawfish. For three consecutive years, a combination of two coarsefish rainbow trout strains plus the Pennask strain were stocked as one-year-old fish into eight study lakes in May 1990 to 1992, and first sampled with gillnets after a five month period. In 1993, the final year of the project, three of the study lakes were stocked with Blackwater, Tzenzaicut, and Pennask strain rainbow trout yearlings. Overall, relative survival of Tzenzaicut and Bootjack fish was better than Pennask. Blackwater recovery rates were inconsistent between broodyears and lakes and Tsuniah fish had consistently lower recovery rates than the Pennask strain. Size at age 1+ of Tzenzaicut, Blackwater, and Tsuniah fish was greater than Pennask and no different for Bootjack. At age 2+, all four coarsefish rainbow trout strains weighed significantly more than Pennask. No differences were found in stomach fullness or stomach content weights for fish caught during regular sampling periods. Incidence of piscivory for Blackwater strain rainbow trout was consistently higher than for other strains. Blackwater fish consumed larger size prey items, such as molluscs, more frequently than any other trout strain. The percentages of males maturing early to spawn at age 2 were significantly lower than Pennask for three coarsefish rainbow trout strains. Overall precocious male rates for Tzenzaicut, Blackwater, and Bootjack fish were ...
Godin, Theresa I., Tsumura, Kanji. 1995. Rainbow Trout Broodstocks for Coarsefish Lakes: Habitat Conservation Fund Final Report (1993-94). Ministry of Environment, Lands and Parks. Fisheries Project Report. RD39
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