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Columbia River Chum Salmon
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Chum salmon
 gif  RELATED INFORMATION
Summer Chum Salmon Conservation Initiative (SCSCI) Report Series
Recreational Salmon Fishing
SalmonScape
Salmonid Stock Inventory (SaSI)

Recovery Efforts of Columbia River Chum Salmon

Since the listing of Columbia River chum salmon as an Endangered Species Act "Threatened" species in March of 1999, WDFW, the U. S. Fish and Wildlife Service, and a variety of local citizen groups have started the process of recovering these fish. While achieving full recovery will necessarily be a long term process, the following discussion outlines projects that are underway and identifies some future needs.

Early Actions

  • Genetic Diversity - Genetic samples have been collected from 50 or more fish each from Hamilton Creek, Hardy Creek, and Grays River. Electrophoretic analysis has been completed for the Grays River and Hamilton Creek Populations. WDFW has collected a few samples from other areas, when the opportunity allows. However, few samples are collected with the few observed fish and the present funding levels.
  • Spawning Channels - WDFW created spawning channels in Hamilton and Gorley Creek in the 1980's. The Hamilton spring spawning channel was modified in 1997. The U.S. Fish and Wildlife Service is 2/3 complete on a spawning channel on Hardy Creek. If funds can be secured (about $40,000), the channel will be completed in the fall of 2000.

    WDFW and partners have requested funding to establish a spawning channel in Duncan Creek. This area historically supported chum salmon and has the spring flow that should make this project successful. After the construction of a lake in the lower end of Duncan Creek that created passage and other habitat problems, the local, self-sustaining population crashed.

  • Hatchery Supplementation - WDFW initiated the development of a local broodstock of chum salmon on the Grays River in 1998. The purpose of this program was to reduce extinction risk in the event of a natural disaster and to develop a broodstock for rebuilding of local chum population. A portion of progeny are released on station with the remaining released at Chinook River hatchery for a Chinook River rebuilding program.
  • Habitat Assessment - WDFW is working on a cooperative study to perform a habitat analysis for chum salmon in most Lower Columbia River tributaries. One goal of this analysis is to prioritize habitat actions needed to recover chum salmon.

Needs

Determine the within region genetic diversity of chum salmon.

  • Collect additional genetic samples from spawning populations in the Columbia River. Presently, WDFW and USFWS have proposed that the Bonneville trap should be operated through December to facilitate non-lethal genetic sampling from the above Bonneville population.
  • WDFW personnel will continue to collect genetic samples when conducting fall stream surveys. However, the small population sizes and current funding limits this effort.

Develop an accurate population estimate for Grays River, and Hamilton and Hardy Creeks.

  • WDFW has a long-term data from these basins. The data consists of live and dead counts conducted through the spawning season. In addition, WDFW has used carcass tagging to develop population estimates in some years. WDFW is in the process of analyzing this data using a variety of population estimation methods.

Develop spawner/recruit curves for chum populations.

  • Once population estimates are finalized, WDFW will proceed with the development of spawner/recruit analysis.

Lessen extinction the near term risks to chum population through habitat modification and/or hatchery intervention.

  • With only two confirmed self-sustaining population centers, there is some risk that a catastrophic event or events may further increase risks to lower Columbia River chum salmon. By establishing more self-sustaining populations this type of risk will be reduced. Also, there is substantial disconnectivity between population centers making colonization between these centers less likely. If self-sustaining populations cannot be maintained in the current habitat, near term actions can include modifying habitat that can support chum salmon and/or maintaining hatchery broodstocks until habitat can support chum salmon.