Abundance and age-sex-size composition of chum salmon escapements in the Chena and Salcha rivers, 1992
By: by Robert A. Clark.
Contributors: Alaska. Division of Sport Fish.
Series: Fishery data series -- no. 93-13.
Publisher: Alaska Dept. of Fish and Game, Division of Sport Fish
Published: 1993
Place of publication: Juneau, Alaska
Language: eng
Number of pages: 33
Subjects: Chum salmon -- Alaska -- Chena River; Chum salmon -- Alaska -- Salcha River; Salmon fisheries -- Alaska -- Chena River; Salmon fisheries -- Alaska -- Salcha River
Description: Abundance of chum salmon Oncorhynchus keta that returned to spawn in the Chena and Salcha rivers during 1992 was estimated in August using mark-recapture techniques. A boat-mounted electrofishing unit equipped with pulsed-direct current was used to capture chum salmon during the marking events. Carcasses of chum salmon were collected and examined for marks during the recapture events. Estimated abundance of chum salmon in the Chena River was 6,083 fish (SE = 1,857 fish), with 3,359 females (SE = 1,034 fish) and 2,724 males (SE = 842 fish). Estimated abundance of chum salmon in the Salcha River was 14,057 fish (SE = 3,813 fish), with 7,945 females (SE = 2,167 fish) and 6,112 males (SE = 1,674 fish). Age and size composition estimates from both rivers indicate that age 0.4 fish (1987 brood year) predominated. Precision in estimates of abundance in both rivers was compromised by bias due to unequal recapture rates between sections of river.
Notes: "April 1993."

Includes bibliographical references (p. 27-28).

Also issued online.