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Coastal Chum Salmon
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Chum salmon

Information and Data

To view coastal chum salmon data base tables click on:
(All data files are in Microsoft Excel (.xls) spreadsheet format)

Discussion

Annual chum salmon escapement and runsize tables (in retrievable spreadsheet form) are provided for Grays Harbor and Willapa Bay chum salmon. The estimates include regional totals for wild and hatchery chum salmon escapements and runsizes. Wild chum salmon are those fish actually produced by naturally spawning parents, and the hatchery fish are the result of artificial enhancement or recovery programs. The data bases span different time periods, because they reflect the years that have the most reliable escapement and harvest information.

The numbers in the tables listed above represent the returns entering the inside waters of these coastal bays, and as such they do not include those fish harvested in the ocean or outside of Washington waters. The runsize category is comprised of the sum of escapements and the all-citizen and tribal net harvests and sport harvests of chum salmon. These data bases may also be missing some minor inside runsize components, such as sport catch or escapements to minor production streams, however, these chum salmon management data bases likely represent 90% or more of the total adult return.

These chum salmon management data bases are subject to future revision. WDFW and the co-managing Tribes are constantly upgrading escapement and catch estimates, and are attempting to develop acceptable estimates of missing runsize components. Management data bases are reviewed by the managers each year, and past values may be changed if better information becomes available. Users of these data bases should periodically check for changes.

The following is a brief summary of the approaches used to estimate coastal chum salmon escapements and runsizes.

Escapement Estimates

Annual estimates of the chum spawning escapements to coastal streams are developed on the watershed scale. Natural spawning chum escapement estimates in the Coastal region are typically based on analysis of live chum counts collected within each watershed. Hatchery escapement estimates result from counts of the fish returning to individual artificial production sites.

Runsize Estimates

To determine the total numbers of salmon returning to specific production areas, fish that are harvested in terminal fisheries must be allocated to the watersheds from which they originated. This allocation is done through a post-season process called "run re- construction," which splits the harvests in each catch area into the numbers of fish that were likely contributed by the individual stocks or management unit thought to be transiting the area. All estimated harvests for each stock or management unit are added to the escapement for that grouping to derive the estimated total return for each year.