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Lower Mid-Columbia Management 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 Mid-Columbia Management Unit Bonneville subpopulationThe Dalles subpopulationJohn Day subpopulationMcNary subpopulation
The Lower Mid-Columbia White Sturgeon Management Unit differs from the rest of the management units as it is the only management unit for which all of the subpopulations are either stable or increasing; however, limited and variable spawning habitat continues to result in recruitment levels that vary significantly, often resulting in little or no annual survival of juvenile white sturgeon beyond their first 12 months.

Through management decisions, restrictive harvest regulations enacted in the late-1980's have contributed to the improved status of the subpopulations in the Lower Mid-Columbia Management Unit. Currently, most subpopulations are at or near their highest abundance level since monitoring began in the late-1980's.

Although fishing and harvest opportunities continue to exist in the Columbia and Snake rivers up to Priest Rapids Dam and Lower Granite Dam, respectively, limits and quotas for commercial, subsistence, and sport harvest exist to protect the subpopulations from overharvest.

Biotic (i.e., predation by other fish) and abiotic (i.e., habitat quality/quantity/fragmentation, flows, water quality, fisheries, and hydrosystem mortality) factors are limiting white sturgeon abundance and productivity in the Lower Mid-Columbia Management Unit.