The performance of two wild rainbow trout stocks (from Pennask and Premier lakes), which are a major source of fish for the hatchery lake stocking program, were compared in three lakes of different productivity. Pennask Lake is a low productivity lake with a large fish population, while Premier Lake is more productive. Equal numbers of both stocks were released into the experimental lakes in May 1985 at a mean weight of 4.6 g for the Premier fish and 7.0 g for the Pennask fish. Fish were sampled in October 1985 at age 1+. Overall, fish averaged 20 g in Headwaters #3, 79 g in Yellow and 138 g in Madden. Premier fish were significantly larger than Pennask in Yellow and Madden Lakes, but were smaller in Headwaters #3. Similarly, there was no difference in survival between the two stocks in Yellow and Madden, but Pennask survived significantly better in Headwaters #3, although sample sizes were low in this lake. The data to date suggests that Pennask fish would do better in low productivity lakes and would be the stock of choice for these lakes when fish allocations are being made.
Hume, Jeremy, Lemke, Larry; Tsumura, Kanji. 1986. A Preliminary Comparison between Pennask and Premier Rainbow Trout Stocks in Lakes with Different Productivities. BC Ministry of Environment. Fisheries Project Report. RD2