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Report: Movements of Wild Summer Run Steelhead Tagged with Radio Transmitters in the Babine River During Fall 1994
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Radio telemetry was used for the second consecutive migration year to determine the
proportion of wild, Babine River adult summer run steelhead migrating through the Department of Fisheries and Oceans enumeration weir, near the outlet of Nilkitkwa Lake.
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Author: Beere, M.C.
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Old Reference Number: sk96
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Date Published: Jan 1997
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Report ID: 2589
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Audience: Government and Public
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Radio telemetry was used for the second consecutive migration year to determine the
proportion of wild, Babine River adult summer run steelhead migrating through the Department of Fisheries and Oceans enumeration weir, near the outlet of Nilkitkwa Lake. The purpose of this investigation was to assess the feasibility of using the weir in conjunction with radio telemetry to conduct annual population estimates for the Babine stock. Conventional angling methods were used to capture steelhead in the upper 45 kilometers of the river on November 7, 1994. Radio transmitters were inserted orally into the stomachs of thirty nine fish. Steelhead movements were monitored with stationary telemetry receivers and by helicopter. Five (12.8 percent) steelhead migrated upstream of the weir and are assumed to have spawned near the outlet of Nilkitkwa Lake. Three (7.7 percent) tagged steelhead migrated to the Nilkitkwa River. Three (7.7 percent) steelhead emigrated from the Babine River during the winter suggesting possible mortality or atypical behavior induced by stress. The high incidence of suspected mortalities raises concerns about radio tagging summer run steelhead in the initial months after entry into fresh water. Kelt emigration rates between the Babine Skeena river confluence and the Exchamsiks Skeena river confluence ranged from 31.2 km per day to 219 km per day; the mean water velocity at the Babine weir during kelt emigration was approximately 130 km per day. The mean date of emigration past the Exchamsiks Skeena river confluence was June 10 (n is 12; 8 males: 4 females). Due to the annual fluctuations in the proportion of Babine steelhead spawning upstream of the weir and the fact that some steelhead migrate through the weir during fall, spring weir counts are not recommended for
annual population estimates for the Babine stock.
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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 - Steelhead - Oncorhynchus mykiss |
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Region - Skeena |
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Fish and Fish Habitat - Telemetry |
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Watershed Groups - 480 - Babine River |
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