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Report: Enumeration of Adult Steelhead in the Upper Sustut River 1997
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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 July 31 1997 to September 30 1997 for the sixth 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.
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Author: BC Conservation Foundation
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Old Reference Number: sk112
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Date Published: May 1998
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Report ID: 2609
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Audience: Government and Public
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The upper Sustut River steelhead population was
enumerated from July 31 1997 to September 30 1997 for the sixth 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. 649 steelhead passed through the fence between August 9 and September 30. An additional 52 steelhead were counted downstream of the fence to the Moosevale Creek confluence. This estimate does not include tagged fish that were previously counted as they migrated upstream through the fence and were then released downstream. The total estimated steelhead escapement to the upper Sustut River was 701 individuals. The fall escapement was 167.7 percent of the estimated number of spawners
required for maximum sustainable yield, and was 67.7 percent of the estimated carrying capacity. The steelhead mortality rate due to handling at the fence was 1.5 percent. In 1997, 15.4 percent of steelhead had gillnet marks and 14.0 percent had predator scars. The percentage of gillnet marked fish was high in the early part of the run and declined steadily until the last enumeration date.
Between July 31 and September 30, a total of 965 sockeye salmon, 5 male coho salmon, 24 bull trout, 6 resident rainbow trout and 4 Rocky Mountain whitefish were counted at the fence. The
first steelhead arrived at the fence on August 9 and by September 13, 50 percent of steelhead had passed the fence. Steelhead of both sexes had similar run timing. Of the four steelhead recaptured in 1997, three were repeat spawners (0.6 percent of those tagged in 1994) and data was unavailable for the fourth fish. In 1997, increases in steelhead migration coincided with changes in water
temperature, but did not coincide with increases in river height. Male steelhead were significantly larger than female steelhead. In 1997, 9.2 percent of male steelhead and 17.8 percent of female steelhead passing the fence were gillnet marked. Gillnet marked males were larger 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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