Abundance and composition of Arctic grayling in the Delta Clearwater River 1996 and 1997
By: by William P. Ridder, Jr.
Contributors: Alaska. Division of Sport Fish.
Series: Fishery data series -- no. 98-35.
Publisher: Alaska Dept. of Fish and Game, Division of Sport Fish
Published: 1998
Place of publication: Anchorage, Alaska
Language: eng
Number of pages: 30
Subjects: Arctic grayling -- Alaska -- Delta Clearwater River.; Fish populations -- Alaska -- Delta Clearwater River.
Other titles: Federal aid in sport fish restoration (Alaska)
Description: Mark-recapture experiments were conducted along 14 mi of the Delta Clearwater River over a two-week period in July 1996 and 1997 to estimate abundance and composition of Arctic grayling Thymallus arcticus. Hook and line were used to capture 916 fish in 1996 and 1,491 fish in 1997. Fish > 150 mm FL were not recaptured in 1996, so that estimates of abundance were truncated to fish > 240 mm FL. In 1997, estimated abundance of Arctic grayling > 150 mm FL was 9,000 fish (SE = 1,100). Estimated abundance of fish > 240 mm FL in 1996 and 1997 was 3,000 fish (SE = 370) and 7,400 fish (SE = 920), respectively. Quality sized and larger fish ( 270 mm FL) predominated in 1997. Ages 5 and 6 fish comprised 48% (SE = 2%) of the 1996 population while ages 4 and 6 comprised 46% (SE = 2%) of the 1997 population.
Notes: "December 1998"

Includes bibliographical references (p. 17-18).

Also issued online.

Partially financed by the Federal Aid in Sport Fish Restoration Act ... Project F-10-12, Job No. R-3-2(c), F-10-13, Job No. R-3-2(c).