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Report: Finlay River Kokanee (Oncorhynchus nerka) Spawning Survey 1990
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A kokanee spawning survey was conducted on the lower 40 km of the Finlay River in northern British Columbia, between October and November, 1990. The survey was conducted to provide information for future enhancement projects. The program objectives were to determine the location, timing and numbers of spawners as well as habitat information and data on kokanee morphology and age.
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Author: Aquatic Resources Ltd.; Peace/Williston Fish and Wildlife Compensation Program; Fielden, R.
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Old Reference Number: HQ1606
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Old Reference System: FISS
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Date Published: Jan 1991
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Report ID: 10191
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Audience: Government and Public
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A kokanee spawning survey was conducted on the lower 40 km of the Finlay River in northern British Columbia, between October and November, 1990. The Finlay River, which flows into the north end of Williston Lake, is to date the only system were kokanee from the lake have been found to spawn. The survey was conducted to provide information for future enhancement projects. The program objectives were to determine the location, timing and numbers of spawners as well as habitat information and data on kokanee morphology and age. A total of 6,573 kokanee were found holding in schools in eight sloughs and back channels along the main river. Total escapement was estimated at 10,000 kokanee. The back channels and sloughs were up to 5 degree Celsius warmer than the mainstem and possibly provided a more stable environment for incubation than the main river. It appeared that the kokanee had moved into these areas before the start of the study. Local residents suggest this may have occurred as early as September. Only a few kokanee spawned during the study and the remainder still appeared to be about a month away from spawning when the survey was ended in the first week of November. The majority of the kokanee were males (81%). Of the 104 kokanee sampled, 98% were three years old and the rest were aged as two. Mean nose-fork length was 30.2 cm (n = 101, s = 1.29 cm). Fecundity in 25 females averaged 406 eggs (s = 111 eggs).
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Report Type
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Fish and Aquatic Habitat Information |
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Subject
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Fish Species - Kokanee - Oncorhynchus nerka |
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Region - Omineca |
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Fish and Fish Habitat - Enhancement Assessment |
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Watershed Groups - 239 - Finlay River |
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