Abundance and Run Timing of Adult Fall Chum Salmon in the Chandalar River, Yukon Flats National Wildlife Refuge, Alaska, 2008. Alaska Fisheries Data Series Number 2009-8

摘要

Dual Frequency Identification Sonar (DIDSON) was used to assess the population abundance of adult fall chum salmon Oncorhynchus keta in the Chandalar River, a tributary of the Yukon River. In 2008, DIDSON operations began on August 8 and continued through September 26. Of the available 2,400 hours of sample time during the season (1,200 on each bank) 2,327.5 hours of data were collected, with 158,920 upriver swimming fish enumerated. After adjustments for missed time, the fall chum salmon passage estimate for 2008 was 162,024. This estimate represents a conservative estimate of total passage because it only included fish that passed during the dates of sonar operation and within the ensonified portion of the river. The passage on the first day of counting was 521 upriver chum salmon. The passage on the final day of counting was 4,226 upriver chum salmon. The first quartile, median, and third quartile passage dates were September 1, 7, and 17 respectively.