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Lower 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 Columbia Management Unit Lower Columbia subpopulation
Of the eight white sturgeon management units, the Lower Columbia White Sturgeon Management Unit is classified as the most abundant and productive and is considered by managers and researchers as healthy and currently not at risk, despite having a population that has been declining since 1995. Managers and researchers have expressed concern that the long-term health of the Lower Columbia Management White Sturgeon Management Unit may be compromised by biotic (i.e., marine mammal predation, native prey, non-native species, and predation by other fish) and abiotic (i.e., habitat quality, quantity, and fragmentation, flows, water temperature, dissolved gas, sediment, pollutants/contaminants, turbidity, fisheries, hydrosystem mortality, and in-water work effects) limiting factors. Subsequently, harvest has become more restrictive in recent years and it is anticipated that all harvest will be prohibited beginning in 2014.