Re-Introduction of Lower Columbia River Chum Salmon into Duncan Creek, 2001-2002 Annual Report.
The National Marine Fisheries Service (NMFS) listed Lower Columbia River chum as threatened under the auspices of the Endangered Species Act (ESA) in March of 1999 (64 FR 14508, March 25, 1999). The listing was in response to reduction in abundance from historical levels of more than half a million returning adults to fewer than 10,000 spawners present day (Johnson et al. 1997). Harvest, loss of habitat, changes in flow regimes, riverbed movement and heavy siltation have been largely responsible for the decline in this species in the Columbia River. The timing of seasonal changes in river flow and water temperatures is perhaps the most critical factor in structuring the freshwater life history of chum salmon (Johnson et al. 1997). This is especially true of the population located directly below Bonneville Dam where hydropower operations can block access to spawning sites, dewater redds, strand fry, cause scour or fill of redds and increase sedimentation of spawning gravels. The recovery strategy for Lower Columbia River chum as outlined in the Hatchery Genetic Management Plan (HGMP) for the Grays River project has four main tasks. First, determine if remnant populations of Lower Columbia River chum salmon exist in Lower Columbia River tributaries.more »
- Publication Date:
- OSTI Identifier:
- Report Number(s):
R&D Project: 200105300; TRN: US200305%%1049
- DOE Contract Number:
- Resource Type:
- Technical Report
- Resource Relation:
- Other Information: PBD: 1 Jan 2003
- Research Org:
- Washington Department of Wildlife
- Sponsoring Org:
- United States. Bonneville Power Administration.
- Country of Publication:
- United States
- 54 ENVIRONMENTAL SCIENCES; 59 BASIC BIOLOGICAL SCIENCES; COLUMBIA RIVER; ENDANGERED SPECIES; EVALUATION; FISHERIES; GENETICS; HABITAT; MONITORING; PLANTS; RIVERS; SALMON; SEDIMENTATION Chum salmon - Spawning - Columbia River - Statistics
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