Alaska Department of Fish and Game, Fishery Data Series No. 12-77, Anchorage
The 2011 Anvik River sonar project operated from late June until the end of July to estimate the passage of summer chum salmon Oncorhynchus keta. Data from each bank was collected using a high frequency imaging sonar (DIDSON) sampling 30 minutes of each hour, 24 hours per day, 7 days per week. The estimated salmon passage was 642,528 fish (SE 6,638). The summer chum salmon passage was 8% below the upper end of the escapement goal range for the Anvik River (350,000 to 700,000 chum salmon). Based on 1979–1985 and 1987–2010 mean quartile passage dates, timing of the 2011 chum salmon run was average. A chum salmon diurnal migration pattern was observed with the highest passage (40%) occurring during the darkest part of the day (2100–0500 hours). Females comprised 52.5% of the catch in beach seines. Age-0.3and 0.4 fish comprised 98.9% of the chum salmon run in 2011
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