Comparative performance of stocked diploid and triploid all female rainbow trout in landlocked lakes, southcentral Alaska, 1992
By: by Alan C. Havens and Sandra Sonnichsen.
Contributors: Sonnichsen, Sandra.; Alaska. Division of Sport Fish.
Series: Fishery data series -- no. 93-34.
Publisher: Alaska Dept. of Fish and Game, Division of Sport Fish
Published: 1993
Place of publication: Anchorage, Alaska
Language: eng
Number of pages: 22
Subjects: Rainbow trout -- Alaska, Southcentral.; Fishery resources -- Alaska, Southcentral.
Description: Diploid mixed-sex and triploid all female rainbow trout Oncorhynchus mykiss were examined for sport fish stocking applications in Alaska. If performance of sterilized rainbow trout is adequate, stocking could be considered in open systems where interbreeding with wild stocks is a concern. Also, the potential for bypassing the rigors of spawning to produce older, larger fish could increase the public appeal of, and participation in, current stocked fisheries. Swanson River strain rainbow trout weighing an average of 2 grams each at stocking were used for this experiment. Diploid (normal) rainbow trout and triploid (sterile) all female rainbow trout were stocked at approximately equal densities in Long (Kepler- Bradley Lakes complex, or K/B), "X", and Wishbone lakes in July 1991. Cohort survivals and mean length at age 1 were estimated and compared in September 1992. Estimated survivals for the age- 1 diploid trout across the three lakes averaged 11% while average survival for the triploid all female fish was estimated at 5%, a greater than two-fold reduction. Mean lengths at age 1 for the diploid fish averaged 187 millimeters, while triploid all female trout averaged 163 millimeters, a greater than 10% reduction in growth.
Notes: "September 1993."

"Partially financed by the Federal Aid in Sport Fish Restoration Act ... under project F-10-3, job no. E-2-3.

Includes bibliographical references (p. 18).

Also issued online.