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Report: Enumeration of Adult Steelhead in the Upper Sustut River 1998
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If you have any questions on the information presented, or require additional report data or attachments, please contact the Report Contact
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The upper Sustut River steelhead population was
enumerated from August 1, 1998 to September 30, 1998 for the seventh consecutive year.
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Author: British Columbia Conservation Foundation
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Old Reference Number: sk120
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Date Published: Mar 1999
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Report ID: 2621
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Audience: Government and Public
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The upper Sustut River steelhead population was
enumerated from August 1, 1998 to September 30, 1998 for the seventh consecutive year. A floating PVC fence located approximately 500 m upstream
of the confluence of the Sustut River with Moosevale Creek, was used for enumeration. 1064 adult steelhead were passed through the fence between August 3 and September 30. An additional 214 steelhead were counted downstream of the fence to the tail out of the Moosevale Creek confluence pool. This estimate does not include tagged fish. The total estimated steelhead escapement to the upper Sustut River was 1252 individuals. The fall escapement was three times the number of adults required for maximum
sustainable yield, and was 20.8 percent above the estimated carrying capacity. The steelhead mortality rate due to handling at the fence was 0.8
percent. In 1998, 13.7 percent of steelhead had gillnet marks. The percentage of gillnet marked fish was steady for the duration of the migration. Between August 1 and September 30, a total of 570 chinook salmon, 2777 sockeye salmon, 64 coho salmon, 28 bull trout, 3 resident rainbow trout and 8 Rocky Mountain whitefish were counted at the fence. The first steelhead arrived at the fence on August 3 and by September 7, 50 percent of
steelhead had passed the fence. Steelhead of both sexes had very similar run timing. Fifteen previously tagged steelhead were recaptured at the fence in 1998. Three were repeat spawners from 1995 and 1996 and three were tagged earlier in 1998 at the Tyee test fishery. Eight were tagged at Sustut Fence in 1998. Tagging data was unavailable for the remaining two fish. Male steelhead were significantly longer than female steelhead. In 1998, 13.4 percent of male steelhead and 13.8 percent of female steelhead passing the
fence were gillnet marked. Gillnet marked males were smaller than unmarked males. Gillnet marked and unmarked females were similar in size.
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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 - Stock Assessment |
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Watershed Groups - 490 - Sustut River |
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