Stock status and rehabilitation of Chena River Arctic grayling during 1995
By: by Robert A. Clark.
Contributors: Alaska. Division of Sport Fish.
Series: Fishery data series -- no. 96-2.
Publisher: Alaska Dept. of Fish and Game, Division of Sport Fish
Published: 1996
Place of publication: Anchorage
Language: eng
Number of pages: 62
Subjects: Arctic grayling -- Alaska -- Chena River -- Statistics.; Fish populations -- Alaska -- Chena River -- Measurement.; Fish-culture -- Alaska -- Chena River -- Statistics.
Description: Stock status of Arctic grayling Thymallus arcticus in the lower 152 km of the Chena River was described by population abundance, age composition, size composition, recruitment, and survival rate estimates during 1995. In July of 1995, estimated abundance of Arctic grayling in the Chena River was 45,114 fish (SE = 4,356) 150 mm FL. Age 2 Arctic grayling were strongly represented in the Chena River, representing 31.2% of fish 150 mm FL. Stock-size Arctic grayling (270 mm FL) represented 79.4% of fish 150 mm FL. Annual recruitment between 1994 and 1995 was 6,326 Arctic grayling (SE = 747) and annual survival during this period was 62.6% (SE = 5.4). Estimated abundance of 1992 brood year (age-3) hatchery-reared Arctic grayling, released in 1993, was 2,015 fish (SE = 282). Survival of age-3 hatchery-reared Arctic grayling from July of 1994 to July of 1995 was 54% (SE = 8.9). Estimated abundance of 1993 brood year (age-2) hatchery-reared Arctic grayling, released in 1994, was 2,325 fish (SE = 371). Survival of age-2 hatchery-reared Arctic grayling from July of 1994 to July of 1995 was 5.5% (SE = 1.1). Since 1992, a total of 126,371 age-1 and 23,199 age-0 Arctic grayling have been released into the Chena River. Estimated abundance of all releases of Arctic grayling in 1995 was 4,340 fish (SE = 466). Low initial post-release survival (~60% during the first month) and low overwinter survival (~8% per year) were the primary causes of failure of the releases.
Notes: "February 1996"

Includes bibliographical references (p. 33-37).

Also issued online.