Stock status and rehabilitation of Chena River Arctic grayling during 1994
By: by Robert A. Clark.
Contributors: Alaska. Division of Sport Fish.
Series: Fishery data series -- no. 95-8.
Publisher: Alaska Dept. of Fish and Game, Division of Sport Fish
Published: 1995
Place of publication: Anchorage
Language: eng
Number of pages: 64
Subjects: Arctic grayling -- Alaska -- Chena River -- Statistics.; Fish populations -- Alaska -- Chena River -- Statistics.; Fish-culture -- Alaska -- Chena River -- Statistics.
Genres: 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 1994. In July of 1994, estimated abundance of Arctic grayling in the Chena River was 44,375 fish (SE was 2,964 fish) 150 mm FL. Age 4 Arctic grayling were strongly represented in the Chena River, representing 34.1 percent of fish 150 mm FL. Stock-size Arctic grayling ( 270 mm FL) represented 79.9 percent of fish 150 mm FL. Annual recruitment between 1993 and 1994 was 13,113 Arctic grayling (SE was 1,183 fish) and annual survival during this period was 76.9 percent (SE was 7.8 percent). On 7 through 30 June 1994, 61,435 hatchery-reared Arctic grayling (1993 brood year) were released at six locations along the lower 152 km of the Chena River. Mean fork length prior to release was 208 mm (SD was 24 mm) and mean weight was 94 g. Estimated abundance of these fish in the lower 152 km of river during July 1994 was 41,928 fish (SE was 5,105 fish) 150 mm FL. Estimated abundance of 1992 brood year hatchery-reared Arctic grayling, released in 1993, was 3,699 fish (SE was 307 fish). Survival of 1992 brood year hatchery-reared Arctic grayling from release in 1993 to July of 1994 was 5.7 percent (SE was 0.5 percent). Survival of 1992 brood year hatchery-reared Arctic grayling from July of 1993 to July of 1994 was 11.2 percent (SE was 1.4 percent), approximately seven-fold lower survival than wild Arctic grayling.
Notes: "July 1995".

Includes bibliographical references (p. 44-47).

Also issued online.