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The Dalles Subpopulation Status and Trends

Information and data adapted from Parker, B., T, Rien, B. James, R. Beamesderfer. 2013. Review Draft Columbia Basin White Sturgeon Planning Framework. Portland, Or.

To view all subpopulations in the basin click here
The Dalles Reservoir subpopulation, which had been increasing since 1988, experienced a significant decline in abundance and density from 2008 to 2011. In 2011, the abundance and density of white sturgeon (>24 inches) were estimated at 101,006 and 9.1 white sturgeon/acre, respectively. From 2008 to 2011, the white sturgeon (> 24 inches) abundance estimate decreased by 32,254. This population decline resulted in a density of 9.1 white sturgeon/acre in 2011.

Monitoring results indicate that survival of juvenile white sturgeon through their first year of life (i.e., recruitment) occurs approximately 90% of the time, and is highly variable.1 Recruitment index values in 2011 were significantly higher than the five-year range and were the highest recorded for The Dalles Reservoir since 1999.

In 2011, managers estimated that 2,730 white sturgeon in The Dalles Reservoir were of a harvestable size (i.e., 43-54 inches). During 2012, the combined annual catch estimate for The Dalles Reservoir commercial and recreational fisheries was 1,274, which was significantly greater than the 10-year average of 565 fish.


Abundance




* Monitoring did not occur during years for which data do not exist.







Density




* Monitoring did not occur during years for which data do not exist.



Productivity


* Index value 0 = No recruitment during that year
* For a description of the methods used to estimate the index value that is associated with the number of fish that survive during their first year , please visit Monitoring Method website.



Hatchery Releases


No releases

Harvest





See other data snapshots that help us gauge the abundance of fish and wildlife:

Subpopulations for Lower Mid-Columbia Management Unit

Other Management Units - Subpopulations