Abundance and Run Timing of Adult Pacific Salmon in the east Fork Andreasfsky River, Yukon Delta National Wildlife Refuge, Alaska, 2006. Alaska Fisheries Data Series Number 2007-5

摘要

A resistance board weir was used to collect abundance, run timing, and biological data from salmon returning to the East Fork Andreafsky River, a tributary to the lower Yukon River, between June 28 and July 27, 2006. In 2006, an estimated 6,463 Chinook salmon Oncorhynchus tshawytscha migrated through the weir. Three age groups were identified from 522 Chinook salmon sampled with age 1.3 (55%) dominating. The sex composition was 44% female. An estimated 102,260 chum salmon O. keta migrated through the weir. Four age groups were identified from 727 summer chum salmon sampled, with age 0.4 (72%) dominating. The sex composition was 48% female. An estimated 220,735 pink salmon O. gorbuscha, 426 sockeye salmon O. nerka, and 23 coho salmon O. kisutch migrated through the weir. Other species counted through the weir during 2006 included 5,829 whitefish (Coregoninae), four Arctic grayling Thymallus arcticus, 51 northern pike Esox lucius, and two Dolly Varden Salvelinus malma.