Stock assessment of Arctic grayling in Fielding Lake during 1991 and 1992
By: by Robert A. Clark.
Contributors: Alaska. Division of Sport Fish.
Series: Fishery data series -- no. 93-2.
Publisher: Alaska Dept. of Fish and Game, Division of Sport Fish
Published: 1993
Place of publication: Anchorage, Alaska
Language: eng
Number of pages: 60
Subjects: Arctic grayling -- Alaska -- Fielding Lake.; Fisheries -- Alaska -- Statistics.
Genres: Statistics.
Other titles: Federal aid in sport fish restoration (Alaska)
Description: From 1986 through 1992, boat electrofishing, fyke nets, beach seines, and gill nets were used to capture and mark 5,816 Arctic grayling Thymallus arcticus in Fielding Lake. The Jolly-Seber capture-recapture estimator was used to estimate abundance, survival rate, and recruitment for 1986 through 1991. Abundance estimates (fish  200 millimeter fork length) ranged from 4,400 fish (SE = 943 fish) in 1987 to 14,145 fish (SE = 3,087 fish) in 1991. Annual survival rate ranged from 0.54 in 1986 (SE = 0.08) and 1988 (SE = 0.07) to 0.85 in 1987 (SE = 0.11), while recruitment ranged from 816 fish (SE = 568 fish) in 1986 to 6,991 fish (SE = 2,049 fish) in 1990. Although age 2 through age 5 fish are not fully recruited to the defined population, age 5 was the most abundant age class in 1988 and 1989; age 3 was the most abundant age class in 1990 and 1991; and, age 4 was the most abundant age class in 1992. No significant (a = 0.05) differences in abundance, survival rate, or recruitment were detected during 1988 through 1991. Instantaneous rates of fishing and natural mortality averaged 0.20 and 0.24 from 1986 through 1990. The average annual exploitation rate of 16 percent appears to be sustainable.
Notes: "Partially financed by the Federal Aid in Sport Fish Restoration Act ... under Project F-10-7 and F-10-8, Job No. R-3-2(b)."

"February 1993."

Includes bibliographical references (p. 41-44).

Also issued online.