Stock status and rehabilitation of Chena River Arctic grayling during 1993
By: by Robert A. Clark.
Contributors: Alaska. Division of Sport Fish.
Series: Fishery data series -- no. 94-5.
Publisher: Alaska Dept. of Fish and Game, Division of Sport Fish
Published: 1994
Place of publication: Anchorage
Language: eng
Number of pages: 62
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 kilometers of the Chena River was described by population abundance, age composition, size composition, recruitment, and survival rate estimates during 1993. In July of 1993, estimated abundance of Arctic grayling in the Chena River was 39,618 fish (SE was 4,836 fish)  150 millimeter fork length. Age 3 Arctic grayling were strongly represented in the Chena River, representing 48.1 percent of fish  150 millimeter fork length. Stock size Arctic grayling (270 millimeter fork length) represented 78.8 percent of fish  150 millimeter fork length. Annual recruitment between 1992 and 1993 was 19,066 Arctic grayling (SE was 2,647 fish) and annual survival during this period was 60.1 percent (SE was 6.2 percent). Although recruitment in 1993 was the largest observed recruitment since 1986, below average recruitment is expected in 1994 and 1995. On 1 through 11 June 1993, 64,936 hatchery-reared Arctic grayling (1992 brood year) were released at seven locations along the lower 160 kilometers of the Chena River. Mean fork length prior to release was 212 millimeters (SD was 22 millimeters) and mean weight was 97 grams. Estimated abundance of these fish in the lower 152 kilometers of the river during July 1993 was 33,061 fish (SE was 3,190 fish)  150 millimeters fork length. Abundance of hatchery-reared fish in July 1993 accounted for 45.5 percent of total abundance (wild plus hatchery fish). Mean fork length of hatchery produced fish was 217 millimeters (SD was 21 millimeters) in July 1993. No pond-reared fish, released in 1992, were captured during stock assessment.
Notes: "July 1994".

Includes bibliographical references (p. 41-47).

Also issued online.