Growth of stocked rainbow trout, Salmo gairdneri Richardson, in Polar Lake, Northwest Territories, 1977-79 / by M.R. Falk and G. Low.: Fs97-4/1578E-PDF

"Polar Lake, situated on the south shore of Great Slave Lake, Northwest Territories, was stocked with rainbow trout in 1977 and 1978. Growth of the trout was monitored through gillnet sampling in the spring and fall of each year from 1977 to 1979. Rainbow trout were stocked in Polar Lake (188 ha) at rates of 64 and 53 fish/ha (3.5 kg/ha) in 1977 and 1978 respectively. Trout stocked in 1977 at ≃76 g grew to 494 g after one year and to 761 g after two years. The 1978 stock (29 g) grew to 282 g in 1979. Annual growth rates for the 1977 stock were 1.2 g/day during the first year and 0.7 g/day during the second year while that for the 1978 stock was 0.6 g/day to 1979. Both the growth rates and the sizes attained were similar to those reported for the Yukon and Manitoba. This is attributed to the comparatively large size of trout at stocking rather than high productivity of Polar Lake. The stocking of rainbow trout in Polar Lake is considered successful, in that trout grew to catchable size after one year and a recreational fishery was created in an area where such opportunities are limited. There were no data to assess the success in terms of survival of the stocks and catch per angler-effort. Recommendations are presented for future research and management of Polar Lake"--Abstract, page iv.

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