Abundance of the chinook salmon escapement on the Chickamin River, 1995
By: by Keith A. Pahlke.
Contributors: Alaska. Division of Sport Fish.
Series: Fishery data series -- no.96-37.
Publisher: Alaska Dept. of Fish and Game, Division of Sport Fish
Published: 1996
Place of publication: Anchorage
Language: eng
Number of pages: 27
Subjects: Chinook salmon -- Alaska -- Chickamin River -- Statistics.; Salmon fisheries -- Alaska -- Chickamin River.; Fish populations -- Alaska -- Chickamin River -- Measurement.
Description: The abundance of large chinook salmon Oncorhynchus tshawytscha that returned to spawn in the Chickamin River in 1995 was estimated using a mark-recapture experiment. Age, sex, and length compositions were estimated for the immigration. Set gillnets were used to capture 112 immigrant chinook salmon 660 mm in (mid-eye to fork) length during June, July, and August 1995; 109 fish were marked with spaghetti tags and opercle punches. During August, 167 chinook salmon 660 mm long were captured at spawning sites and inspected for tags; 7 of these fish had been previously marked. A modified Petersen model (n1 = 109, n2 = 167, m2 = 7) estimated that 2,309 (SE = 723) chinook salmon 660 mm in length immigrated to the Chickamin River in 1995. Peak survey counts in August totaled 356 large chinook, about 15% of the estimated inriver run. From immigrant age and length composition data collected in gillnet and spawning ground samples, it was estimated that 1.8% of the gillnet catch was age -1.1, 20.2% was age -1.2, 37.6% age -1.3, 35.8% age -1.4, and 1.8% age -1.5 (72 males and 63 females) and that 7.3% of the spawning ground samples were age -1.2, 24.4% age -1.3, 66.7% age -1.4, and 1.6% age -1.5 (76 males and 92 females).
Notes: "November 1996"

Includes bibliographical references (p. 15).

Also issued online.

Partially funded by the Federal Aid in Sport Fish Restoration Act (16 U.S.C. 777-777K) Project F-10-11, Job no. S-1-8.