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Alkaline Lakes Enhancement: Habitat Conservation Fund Progress Report (1992-93) Toth, Brian M.
1993
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Abstract: This report summarizes the progress and activities for the second year of a three year Habitat Conservation Fund project investigating survival of rainbow trout and kokanee in alkaline lakes. Growth and survival data from plantings of three strains of rainbow trout released into Lake 55676 on June 6, 1991 indicate significantly greater growth rates for the Tzenzaicut strain than either the Bootjack or Pennask strains after 16 months. There was no difference in relative survival rates between these strains for this period. However, the overall recapture rate of 25% of released fish in Lake 5567 is low compared to recapture rates of greater than 60% in more neutral lakes. Stump, Green and Pennask rainbow trout strains stocked into Lake 5567 on May 4, 1992 demonstrated significant differences in growth rates as well as relative survival rates at age 1+, 4 months after stocking. In-transport acclimation of one-year-old rainbow trout using sodium hydroxide to gradually raise the transport water to pH 9.3, and acclimation in-stream through a naturally ascending pH gradient at the mouth of 83 Mile Creek, resulted in 50% less mortality than fish placed directly into Green Lake. Survival comparisons over five days using three rainbow trout strains in Stump Lake suggest strain-specific differences to survival in high pH lakes. In two trials with Stump, Tunkwa and Pennask strains, mortality rates of 11.3%, 16.5% and 43.4%, respectively, were observed for fish held in lake net pens. Kokanee tested in two lakes, with differing pH, consistently experienced mortality rates of 76 to 80% in Stump Lake compared to 45% in Nicola Lake. Laboratory experiments were conducted to assess and compare the stress tolerances of five rainbow trout strains and one eastern brook trout strain. These fish were subjected to pH 9.3 water for a period of 96 hours, during which time blood was sampled. Blood sodium and blood chloride ion levels were determined ...
 
Toth, Brian M., Tsumura, Kanji. 1993. Alkaline Lakes Enhancement: Habitat Conservation Fund Progress Report (1992-93). Ministry of Environment, Lands and Parks. Fisheries Project Report. RD33
 
Topic: Conservation + Mgmt (Wildlife, Fish, Plant)
Keywords: alkaline, acclimation, lakes, enhancement, rainbow trout, kokanee, eastern brook trout
ISSN:  Scientific Name: Salvelinus fontinalis, Oncorhynchus nerka, Oncorhynchus mykiss
ISBN:  English Name: Brook Trout, Sockeye Salmon, Rainbow Trout
Other Identifier: FPR RD33
 
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