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Lower Snake Unit 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.

Click on subpopulation to view status and trends.    To view all subpopulations in the basin click here
Lower Snake Unit Ice Harbor subpopulationLower Monumental subpopulationLittle Goose subpopulation
The Lower Snake White Sturgeon Management Unit includes three subpopulations, all of which are represented by older adult fish yet lack the presence of juveniles. Although spawning is occurring in the tailrace areas near the dams, efforts to collect juvenile white sturgeon during their first year of life have been relatively unsuccessful, leading researchers to describe the populations as recruitment-limited. Results from monitoring studies indicate that density, growth, and fitness for white sturgeon subpopulations in the Lower Snake Management Unit are less than that which has been observed for the subpopulations immediately downriver in the Lower Mid–Columbia White Sturgeon Management Unit. Contributing to the declines are factors such as habitat fragmentation, habitat diversity/quantity/quality, flows, and predation.

Although fishing and harvest opportunities exist, conservative limits are in place to protect the subpopulations from overharvest.