Fisheries, Subsistence, and Habitat
Publications Searchable Database
Search Again| Division: | Sport Fish |
| Title: | Estimates of Chinook salmon passage in the Kenai River using split-beam sonar, 2006 |
| Author: | Miller, J. D., D. L. Burwen, and S. J. Fleischman |
| Year: | 2010 |
| Report ID: | Alaska Department of Fish and Game, Fishery Data Series No. 10-40, Anchorage. |
| Abstract: | Chinook salmon Oncorhynchus tshawytscha passage in the Kenai River in 2006 was estimated using split-beam sonar technology. Early (16 May 30 June) and late (1 July 10 August) runs of Kenai River Chinook salmon have been monitored acoustically since 1987. A 200 kHz split-beam sonar system has been used since 1995 to estimate numbers of adult Chinook salmon migrating into the Kenai River. From 1987 to 1994, a 420 kHz dual-beam sonar system was used to generate similar estimates. In 2006, the sonar project operated from 16 May through 8 August. The total estimated upstream passage of Chinook salmon in 2006 was 60,318 (SE = 657): 23,326 (SE = 394) during the early run and 36,992 (SE = 526) during the late run. Total late-run passage estimate extrapolated through the end of the run on 10 August was 37,743 (SE = 719). The standard errors associated with these estimates reflect only sampling error and not other sources of uncertainty including target detection, species composition, direction of travel, and target tracking. The early-run peak daily passage occurred on 17 June with 50% of the run having passed by 16 June. The late-run peak daily passage occurred on 16 July, with 50% of the late run having passed by 21 July. |
| Keywords: | split-beam sonar, dual-beam sonar, Chinook salmon, Oncorhynchus tshawytscha, acoustic assessment, Kenai River, riverine sonar, early run, late run. |