Abundance and Run Timing of Dolly Varden in the Middle Fork Goodnews River, 2007. Alaska Fisheries Data Series Number 2008-7

摘要

Dolly Varden annual run timing, total run and spawner abundance were estimated in the Middle Fork Goodnews River using a salmon escapement monitoring weir from 25 June to 10 September, 2007. The 2007 run timing is consistent with historical run monitoring, but total abundance of 1,692 was the lowest on record and only 61% of the 1996 to 2006 average run of 2,786. The number of mature, prespawning Dolly Varden was estimated by apportioning the weir counts based on a sample of 324 fish caught in the weir live trap. In 2007, approximately 1,120 mature Dolly Varden passed upstream of the weir. Previous estimates for the years 2001 through 2004 averaged approximately 1,318 (range 735 to 2,292) mature Dolly Varden.