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This report summarizes the activities and progress in the fifth and final year of a Habitat Conservation Fund project comparing the survival of “alkaline strain” rainbow trout (Oncorhynchus mykiss) from Stump (pH 8.8-9.3) and Green (pH 9.0-9.3) lakes, to that of a "non-alkaline strain" from Pennask Lake (pH 6.7-7.5), introduced into high pH lakes (pH 8.9-9.3). Long-term (four years) survival studies using rainbow trout were conducted in Lake 5587 and Till Lake from 1992 to 1995. Lake 5587 (Pigeon Lake, pH 9.0) received annual stockings of age 1 rainbow trout progeny from Stump, Green and Pennask lakes brood fish. After three years of sampling 1991 broodyear rainbow trout in Lake 5587, cumulative catches of Stump and Green lakes strains showed significantly higher recovery rates of over 32% of the original number stocked compared to 19% for the Pennask strain. Two years of sampling the 1992 broodyear showed that cumulative catches for Stump and Green strains were 37.3% and 43.7%, respectively, compared to 30.8% for the Pennask strain. After one year of sampling the 1993 broodyear, results showed similar recoveries of all strains: 21.5% for Stump fish, 23.5% for Green fish and 26.3% for Pennask fish. Annual growth of the Stump and Green strains were significantly greater than that of the Pennask strain for all broodyears. Sampling of the 1993 broodyear fish, after one year in the lake (age 2), revealed that the "alkaline" strains weighed 45% more than the Pennask strain. Long term studies of fish stocked in Till lake from 1992 to 1995 also indicate that the "alkaline" strains have a survival advantage over the "non-alkaline" strain. Following four low effort sampling periods, the cumulative catches of Stump, Green and Pennask fish (three broodyears) from Till Lake were 2.5%, 1.3% and 0.3%, respectively, of the numbers stocked. Short term (20 to 37 days) netpen survival studies were conducted ...
Mathias, Karin L., Tsumura, Kanji; Godin, Theresa I.. 1995. Alkaline Lakes Enhancement: Habitat Conservation Fund Final Report (1995-96). Ministry of Environment, Lands and Parks. Fisheries Project Report. RD43
Keywords: rainbow trout, Oncorhynchus mykiss, kokanee, water chemistry, habitat, survival, stocking, management, Stump Lake, Green Lake, Pennask Lake, Till Lake
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