Spawning abundance of chinook salmon in the Taku River in 1998
By: by Scott A. McPherson ... [et al.].
Contributors: McPherson, Scott A.; Alaska. Division of Sport Fish.
Series: Fishery data series -- no. 99-26.
Publisher: Alaska Dept. of Fish and Game, Division of Sport Fish
Published: 1999
Place of publication: Anchorage
Language: eng
Number of pages: 25
Subjects: Chinook salmon -- Alaska -- Taku River -- Statistics.; Fish tagging -- Alaska -- Taku River -- Statistics.; Fish populations -- Alaska -- Taku River -- Statistics.; Chinook salmon -- Spawning.
Genres: Statistics.
Description: A mark-recapture study involving the Alaska Department of Fish and Game, the Taku River Tlingit First Nation, and the Department of Fisheries and Oceans Canada was conducted to estimate the number of spawning chinook salmon Oncorhynchus tshawytscha in the Taku River in 1998. Fish were captured at Canyon Island on the lower Taku River with fish wheels from May through August. The fish were individually marked with back-sewn, solid-core spaghetti tags and were batch marked as well with an opercle punch plus removal of the left axillary appendage. Sampling on the spawning grounds in tributaries was used to estimate the fraction of the population that had been marked. Spawning abundance of small and medium-size chinook salmon (270659 mm in length from mid eye to tail fork) was estimated to be 11,775 (SE = 3,237), estimated from the mark-recapture experiment. Estimated spawning abundance of large-size fish (660 mm) was 31,039 (SE = 12,720); this estimate was derived by expanding aerial survey counts because of low tagging and recovery rates for large chinook salmon. The estimated total spawning population of chinook salmon was 42,814 (SE = 13,125). The 1992 brood year (primarily age 1.4) constituted 49% of the estimated spawning population.
Notes: "October 1999."

Includes bibliographical references (p. 13-14).

Also issued online.