Assessment of selected stocks of arctic grayling in streams of the Seward Peninsula, Alaska during 1993
By: by Alfred L. DeCicco.
Contributors: Alaska. Division of Sport Fish.
Series: Fishery data series -- no. 94-12.
Publisher: Alaska Dept. of Fish and Game, Division of Sport Fish
Published: 1994
Place of publication: Anchorage, Alaska
Language: eng
Number of pages: 49
Subjects: Arctic Grayling -- Alaska -- Seward Peninsula.; Fish populations -- Alaska -- Seward Peninsula.
Description: Stock status of Arctic grayling Thymallus arcticus was investigated in the Snake, Nome, Pilgrim and Sinuk rivers of the Seward Peninsula during 1992. Population abundance, age composition, length composition and length-at-age were estimated. Survival rates from 1989 to 1990, from 1990 to 1991, and from 1991 to 1992 were estimated for Arctic grayling in the Sinuk River. The number of Arctic grayling over 249 millimeters in fork length was estimated at 1,761 fish (SE = 129) in a 48 kilometer section of the Snake River. The density was 37 fish/kilometer. Arctic grayling ranged from 213 to 481 millimeters in fork length and in age from 2 to 12 years. In a 12 kilometer section of the Pilgrim River, the estimated abundance of Arctic grayling greater than 239 millimeters in fork length was 708 fish (SE = 92) or 59 fish/kilometer. They ranged from 187 to 495 millimeters in fork length and from 2 to 13 years of age. The estimated abundance of Arctic grayling greater than 324 millimeters fork length in a 40 kilometer section of the Sinuk River just prior to August 1992 was 1,782 fish (SE = 255) or 45 fish/kilometer. Arctic grayling sampled in 1993 ranged from 104 to 521 millimeters in fork length and from 1 to 15 years in age. The modified Jolly - Seber estimate of survival from 1989 to 1990 was 1.00 (SE = 0.06), from 1990 to 1991 was 0.77 (SE = 0.12), and from 1991 to 1992 was 1.00 (SE = 0.23). In the Snake and Pilgrim rivers more fish (53 and 47 percent) were in the "preferred" Relative Stock Density category, while "memorable" fish comprised 52 percent of the Sinuk River sample in 1992. Mean length-at-age was greatest for Arctic grayling from the Sinuk River and least for fish from the Unalakleet River.
Notes: "July 1994."

"Partially financed by the Federal Aid in Sport Fish Restoration Act ... under project F-10-9, job no. R-3-2(d).

Includes bibliographical references (p. 32-34).

Also issued online.