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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 27 to September 30, 2001, using a floating PVC fence.
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Author: Diewert Consulting Services
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Old Reference Number: sk130
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Old Reference System: Skeena Fisheries Report
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Date Published: Mar 2002
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Report ID: 2632
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Audience: Government and Public
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The upper Sustut River steelhead population was
enumerated from July 27 to September 30, 2001, using a floating PVC fence. The first steelhead migrated past the fence on August 15 and by September 30, a total of 756 steelhead had been released upstream. This value was defined as
the upper Sustut River steelhead index for 2001. An additional 42 steelhead were observed downstream of the fence on September 30 making the estimated spawning escapement to the upper Sustut River 798 steelhead. The population
index for 2001 was the second highest on record while the spawning escapement was 77 percent of the estimated carrying capacity for the upper Sustut
system. Between July 27 and September 30, a total of 1639 chinook salmon, 1257 sockeye salmon, 9 coho salmon, 30 bull trout, 0 resident rainbow trout and 24 Rocky Mountain whitefish were
counted passing upstream of the fence. Eighteen steelhead tagged at the upper Sustut River fence in 1999 were recaptured in 2001 indicating that a minimum of 2.5 percent of the 1999 run returned as potential repeat spawners. While the percentage of repeat spawners was above the long term average, the growth between spawning events was below the average. Three steelhead tagged at the fence
in 1998 were recaptured in 2001 indicating that a minimum of 0.2 percent of the 1998 run returned as potential repeat spawners. Age analysis from scales revealed that all the adult steelhead had at least two marine annuli, and repeat spawners made up 6.1 percent of the sample. The most prevalent age was 4.3plus followed by 4.2plus. The
majority of the steelhead spent four years in freshwater, while 6.7 percent had a three year freshwater age, and 6.7 percent had a five year freshwater age.The ratio of female to male steelhead was 1.63 to 1. The average fork length of males and females was 86.4 and 77.1 cm, respectively. A total of 12.8 percent of all steelhead handled at the fence exhibited gillnet marks. This falls in the middle portion of historical values, which have ranged from 2 to 23 percent and averaged 11.7 percent. Female steelhead exhibited a higher gillnet mark rate than males. Further, gillnet marked
males and females were significantly smaller than those without gillnet marks. With the addition of the 2001 data point, the upper Sustut steelhead
population index was no longer correlated with the cumulative Tyee test fishery index to August 10.
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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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