Use of Split-Beam Sonar to Enumerate Fall Chum Salmon in the Chandalar River, Yukon Flats National Wildlife Refuge, Alaska, 2001. Alaska Fisheries Data Series Number 2006-6

摘要

A fixed-location, split-beam hydroacoustic study was initiated in 1994 to assess the population status of adult fall chum salmon Oncorhynchus keta in the Chandalar River, a tributary of the Yukon River. Annual escapement estimates have been made since 1995 and daily in-season counts have been provided since 1996. This report presents the results for the 2001 season and describes the annual variability in run size and timing. Sonar operation began on August 8 and continued through September 26. High water during August 18-20 resulted in 3 days of missed sampling on the right bank. A total of 2,208 hours of digital echo processor data were collected, resulting in 99,901 fish manually tracked. Upstream-traveling fish accounted for 98.1% of the total tracked targets.