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Report: A Reconnaissance of Tuya Lake August 7 to 13 2002 (00373TUYR)
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A cursory reconnaissance survey was undertaken at Tuya Lake to assess the potential impacts of Tahltan Lake origin sockeye salmon introductions and as a follow up to a previous inventory study conducted in 1986 (Coombes 1986).
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Author: Beere, Mark C.
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Old Reference Number: sk135
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Old Reference System: Skeena Fisheries Report
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Date Published: Nov 2002
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Report ID: 2641
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Audience: Government and Public
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A cursory reconnaissance survey was undertaken at Tuya Lake to assess the potential impacts of Tahltan Lake origin sockeye salmon introductions and as a follow up to a previous inventory study conducted in 1986 (Coombes 1986). Gillnets, conventional angling gear, electroshocking and beach seining were used to capture fish in Tuya
Lake, Tuya River and in two streams tributary to Tuya Lake. One hundred and 60 fish were captured in 44.1 hours of gillnetting, of which 35 percent were Arctic grayling and 23.8 percent were kokanee. Almost 20 percent of kokanee captured did not possess the thermal mark given to outplanted sockeye fry, indicating that a self propagating kokanee population has established itself in Tuya Lake. Kokanee ranged in size from 169 mm to 245 mm. 60.7 percent of male and 37.5 percent of female kokanee were sexually mature. The Tuya River upstream of Tuya Lake and the unnamed creek west of Butte Creek were found to be the systems with the most spawning potential for Arctic grayling. The previous investigation determined that 64.3 percent of Arctic grayling sampled utilized zooplankton in their diet. In the current investigation, zooplankton were completely absent within a subset of 25 percent of all grayling captured. Further investigation is recommended to
determine the extent of the ecological impacts of large scale sockeye fry outplants and the resulting establishment of a kokanee population on the indigenous fish species of Tuya Lake.
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Report Type
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Fish and Aquatic Habitat Information |
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Subject
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Region - Skeena |
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Fish and Fish Habitat - Fish Inventory |
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Fish and Fish Habitat - Lake |
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Watershed Groups - 650 - Tuya River |
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