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Natural Reproductive Success and Demographic Effects of Hatchery-Origin Steelhead in Abernathy Creek, Washington

Data Categories Adult returns
Dates of Data 2005 TO 2017
Data Set Status In work
Data Set Update Schedule Annually
Date Data Set Published on StreamNet Data Store 08-22-2017
Project Name & Number 2003-063-00
Purpose of Data Set Our goal is to determine the natural reproductive success and mean relative fitness of hatchery-origin (HOR) and natural-origin (NOR) steelhead and assess the demographic effects of hatchery fish supplementation in Abernathy Creek relative to two adjacent control streams. The long-term contribution of stocked fish to recruitment of steelhead populations is unknown. Because stocking is only one of several management options for this species, it is critical to learn additional information about factors limiting hatchery production and natural recruitment processes. Information on the effect of rearing technique, size and physiological status of stocked fish, propensity of stocked fish to residualize, and genetic contribution is needed to optimize use of hatchery produced fish while simultaneously conserving wild stocks. We initiated our study by creating steelhead broodstock by captively rearing NOR juveniles to sexual maturity. Since 2003 we have released approximately 20,000 HOR steelhead smolts annually. Our results indicate that the timing of HOR and NOR smolts emigrating out of Abernathy has been similar and that populations among streams has remained relatively constant among years. However, emigrating HOR juvenile fish differ physiologically and morphologically compared to NOR fish and may be less prepared to emigrate into saltwater. As a result the number of residual HOR fish has
doubled since 2004. These residual HOR fish may negatively effect NOR fish via intraspecific competition. Since there is a high level of genetic variability in Abernathy steelhead and the broodstock created with these procedures have returned as adults and reproduced naturally, we will be able to determine reproductive success and demographic effects of hatchery fish supplementation in subsequent years.
Summary / Abstract Adult salmonids trapped at Abernathy FTC, USFWS 2005 - 2017, BPA Project No. 2003-063-00
Broad Biological Groups
Location Abernathy Creek, Cowlitz County, Washington
NPCC Subbasins (2001 Subbasins)
Lower Columbia: Columbia lower
Keywords adult returns, steelhead, coho, cutthroat
Lead Person and Organization That Created the Data Set US Fish and Wildlife Service (USFWS)
Other Participating Organizations Funding provided by Bonneville Power Administration
Contact Person for Questions About the Data Name:  John Holmes
Organization:  US Fish and Wildlife Service (USFWS)
Address:  1440 Abernathy Creek Road
Longview, WA  98632
Phone:  360 425 6072 ext 320
Broad Category of Methods Field
Data Collection Methods Fish returns diverted into holding pond and captured in V trap
File Formats Microsoft Excel 2000 or later
Data structure description See data set files.
URL where updated data may be available
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File Size: 11 KB