Stock assessment of Arctic grayling in the Salcha, Chatanika, and Goodpaster Rivers during 1994
By: by Stafford M. Roach.
Contributors: Alaska. Division of Sport Fish.
Series: Fishery data series -- no.95-9.
Publisher: Alaska Dept. of Fish and Game, Division of Sport Fish, Research and Technical Services
Published: 1995
Place of publication: Anchorage
Language: eng
Number of pages: 106
Subjects: Arctic grayling -- Alaska -- Salcha River -- Statistics.; Arctic grayling -- Alaska -- Chatanika River -- Statistics.; Arctic grayling -- Alaska -- Goodpaster River -- Statistics.; Fish populations -- Alaska -- Salcha River -- Statistics.; Fish populations -- Alaska -- Chatanika River -- Statistics.; Fish populations -- Alaska -- Goodpaster River -- Statistics.; Fish-culture -- Alaska -- Salcha River.; Fish-culture -- Alaska -- Chatanika River.; Fish-culture -- Alaska -- Goodpaster River.
Genres: Statistics.
Description: Abundances and stock compositions of Arctic grayling Thymallus arcticus were estimated for portions of the Salcha, Chatanika, and Goodpaster rivers in 1994 using single-sample mark-recapture experiments. The Salcha River study area extended from river kilometer 40 downstream to the Richardson Highway Bridge (river kilometer 3.2); the Chatanika River study area extended from 3.2 kilometers above the Elliott Highway Bridge downstream to Any Creek; and, the Goodpaster River study area extended from river kilometer 52.3 downstream to river kilometer 2.7. Estimated abundance of Arctic grayling greater than or equal to 150 millimeters fork length for the Salcha River study area was 14,562 fish (standard error was 1,762), for the Chatanika River study area 6,044 fish (standard error 839), and for the Goodpaster River study area 7,574 fish (standard error 1,617). Estimated densities of Arctic grayling greater than or equal to 150 millimeters fork length within the Salcha River study area was 396 fish per kilometer (standard error was 48), within the Chatanika River study area 204 fish per kilometer (standard error 28), and within the Goodpaster River study area 151 fish per kilometer (standard error 32). The densities of age-3 fish were 101 fish per kilometer (standard error was 11) within the Salcha River study area; 38 fish per kilometer (standard error 5) within the Chatanika River study area, and; 17 fish per kilometer (standard error 4) within the Goodpaster River study area. The proportions of age-3 fish were 0.23 (standard error was 0.02) in the Salcha River study area; 0.19 (standard error 0.02) in the Chatanika River study area, and; 0.33 (standard error 0.02) in the Goodpaster River study area. The densities of Arctic grayling greater than or equal to 270 millimeters fork length were 60 fish per kilometer (standard error was 7) within the Salcha River study area, 83 fish per kilometer (standard error 11) within the Chatanika River study area, and 31 fish per kilometer (standard error 7) within the Goodpaster study area. The proportions of Arctic grayling greater than or equal to 270 millimeters fork length were 0.15 (standard error was 0.02) within the Salcha River study area, 0.41 (standard error 0.02) within the Chatanika River study area, and 0.20 (standard error 0.01) within the Goodpaster study area. For comparison of abundance between years: abundance of Arctic grayling greater than or equal to 150 millimeters fork length within the Salcha River study area was 15,950 fish (standard error was 2,442) in 1993; within the Chatanika River study area 7,311 fish (standard error 1,200) in 1993; and, within the Goodpaster River study area 10,841 fish (standard error 1340) in 1993.
Notes: "July 1995".

"Literature cited": p. 46-50.

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