Evaluation of the Arctic grayling stock in the Gulkana River, 1998
By: by James T. Fish and Stafford M. Roach.
Contributors: Roach, Stafford M.; Alaska. Division of Sport Fish.
Series: Fishery data series -- no. 99-28.
Publisher: Alaska Dept. of Fish and Game, Division of Sport Fish, Research and Technical Services
Published: 1999
Place of publication: Anchorage
Language: eng
Number of pages: 24
Subjects: Arctic grayling -- Alaska -- Gulkana River -- Statistics.; Fishery resources -- Alaska -- Gulkana River -- Statistics.; Fishes -- Alaska -- Gulkana River -- Statistics.
Genres: Statistics.
Description: Catch composition studies of the Arctic grayling Thymallus arcticus stock in the Gulkana River were conducted during July 1998 and compared to historical data. Length and age distributions of fish captured in 1998 differed significantly from fish caught in 1990, 1991, and 1992 (P < 0.01). There were significantly more large fish (320 mm FL; 14 in) in the 1998 sample when compared to 1990, 1991, and 1992. There were also significantly more fish 270 mm FL (12 in) in the 1998 sample when compared to 1990, 1991, and 1992. Proportions in three critical length categories (150 to 269 mm FL, 270 to 319 mm FL, and 320 mm FL) were all greater than minimum threshold levels. Proportions were 0.50 for fish from 150 to 269 mm FL (~7 to 12 in TL), 0.31 for fish from 270 to 319 mm FL (~12 to 14 in TL), and 0.19 for fish 320 mm FL. This data along with relatively light exploitation (<2,000 fish per year on average) suggests that abundance information is not needed at this time.
Notes: "October 1999."

Includes bibliographical references (p. 16-17).

Also issued online.