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Adult Steelhead Population Size and Salmonid Migrants of the Keogh River During the Spring 1990 Ward, B.R.
1990
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D
Abstract: Data obtained in 1990 from a fish counting fence installed on the Keogh River, a coastal stream located on northeastern Vancouver island near Port Hardy, BC, added to more than a decade of information collected on wild steelhead trout (Oncorhynchus mykiss). The total number of wild adults in 1990 was estimated to be 1374; the sex ratio was !:!.1, female to male. Mean lengths and weights were obtained for wild spawners (males 795.4 mm, 5.8 kg; females 764.9 mm, 4.9 kg), and mean lengths were obtained for wild kelts (males 764.1 mm, females 758.6 mm). Wild fish were estimated to comprise 72% and hatchery fish 28% of the total steelhead run on the Keogh River. The migration of wild adult steelhead was biased to the late-run component, which was relatively abundant, yet preliminary estimates of oceanic survival were low for smolts which contributed to these returns. Preliminary returns of pen-reared smolts released early in May 1988 were compared to returns of fish which were released at the peak of wild steelhea
 
Ward, B.R., Burrows, J.A.; Quamme, D.L.. 1990. Adult Steelhead Population Size and Salmonid Migrants of the Keogh River During the Spring 1990. Ministry of Environment. Fisheries Technical Circular. FTC89
 
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Keywords: Keogh River, steelhead, coho salmon, cutthroat trout, Dolly Varden, cottids, population estimates, sex ratio, size, weight, hatchery, migration, survival, salmonids
ISSN: 0229-1150 Scientific Name: Salvelinus malma, Oncorhynchus nerka, Oncorhynchus mykiss, Oncorhynchus kisutch
ISBN: 0-7726-1224-2 English Name: Sockeye Salmon, Coho Salmon, Dolly Varden, Rainbow Trout
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