Evaluations of introduced lake trout in the Tanana drainage, and estimation of mortality using maximum age analysis
By: by John M. Burr.
Contributors: Alaska. Division of Sport Fish.
Series: Fishery data series -- no. 93-27.
Publisher: Alaska Dept. of Fish and Game, Division of Sport Fish
Published: 1993
Place of publication: Anchorage, Alaska
Language: eng
Number of pages: 64
Subjects: Lake trout -- Alaska -- Interior Region -- Statistics.; Fishes -- Alaska -- Interior Region -- Statistics.; Fishery resources -- Alaska -- Interior Region -- Statistics.
Genres: Statistics.
Description: Lake trout stocked as yearlings (age-0) into small lakes in the Tanana drainage in 1988, 1989, and 1991 were sampled during 1992 to estimate abundance, growth, and survival. Estimated abundance of stocked lake trout > 244 millimeters fork length in Coalmine #5 Lake was 650 fish (SE = 167); > 214 millimeters in Pauls Pond was 316 fish (SE = 30); > 159 millimeters in North Twin Lake was 711 fish (SE = 171); > 184 millimeters in Chet Lake was 427 fish (SE = 25); > 188 millimeters in Nickel Lake was 476 (SE = 53); > 228 millimeters in Ghost Lake was 27 (SE = 5); and > 135 millimeters in Rapids Lake was 50 (SE = 13). Growth was rapid in these small lakes and was equal to or exceeded rates estimated from wild populations. Survival to age-4 for the populations varied from 0.01 to 0.017 with a mean of 0.11 (SE = 0.02). Mean survival to age-3 was estimated at 0.26 (SE = 0.03, 0.03 - 0.62). Survival to age-1 varied from 0.01 to 0.71 with a mean of 0.36 (SE = 0.09). Stocked lake trout were present in sufficient numbers at Fourmile, Triangle, and Fourteenmile lakes to warrant future stock assessment. Catch rates of stocked lake trout in Summit Lake were too low to encourage future stock studies; no lake trout were caught in West Twin Lake. Total annual mortality was estimated for eight wild lake trout populations using maximum age analysis. Estimates varied from 0.17 in Twobit Lake to 0.55 in Paxson Lake. The results using this method compared well with results from the Jolly Seber method.
Notes: "August 1993".

"Literature cited": p. 46-47.

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