Abundance, egg production, and age-sex-length composition of the chinook salmon escapement in the Chena River, 1992
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Author
Contributions
- Alaska. Division of Sport Fish. - Contributor
Publication
1993 - Alaska Dept. of Fish and Game, Division of Sport Fish, Anchorage, Alaska, Alaska
Language
English
Alternate Titles
- Federal aid in sport fish restoration (Alaska)
Description
In 1992, the number of adult chinook salmon Oncorhynchus tshawytscha that returned to spawn in the Chena River near Fairbanks, Alaska, was estimated using a mark-recapture experiment. A riverboat equipped with electrofishing gear was used to capture 799 chinook salmon in late July and early August. Captured chinook salmon were marked with jaw tags, fin-clipped, and released. In early August, 581 chinook salmon carcasses were collected. Eighty-eight of these carcasses had been marked. The estimate of abundance was 5,230 (SE = 478) chinook salmon. The estimated number of females and males were 1,607 (SE = 162) and 3,623 chinook salmon (SE = 338), respectively. Estimated potential egg production was 14.9 million eggs (standard error = 1.1). Mean length-at-age statistics and age class composition estimates are presented. During aerial surveys, the highest count of live and dead chinook salmon was 825, or 16 percent of the mark-recapture point estimate.
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