Fish/Shellfish Research and Management
Date Published: May 2014
Number of Pages: 45
Juvenile salmonid monitoring on the Duckabush River, located in central Hood Canal, Washington, began in 2007. This work has been a collaborative project between the Washington Department of Fish and Wildlife (WDFW), Long Live the Kings (LLTK), and the Northwest Fisheries Science CenterÂfs (NWFSC) Manchester Research Station. This study measures the juvenile abundance and outmigration timing of Chinook salmon, chum salmon, pink salmon (even years only), coho salmon, and steelhead. We derive independent estimates for summer and fall chum salmon stocks in these watersheds via molecular genetic analysis. For those species with adult abundance surveys (chum, Chinook and pink salmon), we also estimate egg to migrant survival.
In 2013, a floating eight-foot screw trap was located at river mile 0.3 (0.48 rkm) and operated by WDFW from January 10 to July 2. The abundance of juvenile summer chum salmon was over six times larger than fall chum (Table 1). Egg-to-migrant survival was higher for summer than fall chum salmon. The peak of the summer chum outmigration occurred 4 weeks earlier than the peak of the fall chum outmigration. Chum salmon were by far the most abundant salmonid species emigrating from the Duckabush River in 2013 (Table 1).
TABLE 1.Abundance, coefficient of variation (CV), egg-to-migrant survival, average fork length and median out-migration date for juvenile salmonids of natural origin leaving the Duckabush River, 2013.
||Median migration date
||Average fork length
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