Evaluation of Arctic grayling enhancement: a cost per survivor analysis

• Main Author: Skaugstad, Calvin Loren
• Format: Thesis
• Language: English
• Published: 1989
• Subjects: Arctic grayling; Fish populations; Fish stocking; Grayling; Arctic; Fairbanks; Thymallus arcticus; Alaska
• Online Access: http://hdl.handle.net/11122/14809

Thesis (M.S.) University of Alaska Fairbanks, 1989 Age-O Arctic grayling Thymallus arcticus were stocked as sac fry and fingerlings in lakes in interior and south central Alaska to evaluate cost per survivor at age 1. When sac fry, 4-g, and 6-g fingerlings were stocked in the same lakes in 1986, estimates of the mean rate of survival at age 1 were 0.08, 0.63, and 0.75. The differences were significant. The mean costs per survivor at age 1 were $1.58, $0.24, and $0.21. The differences were significant between sac fry and both sizes of fingerlings. However, the difference was not significant between 4-g and 6-g fingerlings. When sac fry and 4-g fingerlings were stocked in different lakes in 1986 and again in 1987, estimates of the mean rate of survival to age 1 were 0.11 and 0.34. The difference was significant. The mean costs per survivor at age 1 were $0.82 and $0.70. The difference was not significant. I recommend stocking 4-g fingerlings because they require less rearing in a hatchery than 6-g fingerlings and the cost per survivor is usually less than that for sac fry. Division of Sport Fish, Alaska Department of Fish and Game, Federal Aid in Sport Fish Restoration Act (16 U.S.C. 777-777K) under Project F-10-4, Job Number G-8-2