Historical amphidromous species that has extremely limited access to the ocean or estuary which has been restricted by dams.
Limiting factors
Long-lived, late-maturing species with relatively low population size. Habitat: Limited spawning habitat. Hydro-system impacts, including direct mortality, dewatering of early life history stages associated with load following and power peaking water fluctuations, and blocked access to historic range. White Sturgeon may be subjected to significant illegal harvest due to the monetary value of their roe.
Data gaps
Little to no information on population size and reproductive success. Areas in the lower Snake River show very limited growth and further delayed at maturity, which can greatly limit reproductive success. In other areas of the Snake River, there are high levels of methyl mercury which can alter development and reproductive success.
Conservation actions
Use species-specific population assessments and habitat
requirements to document status of the population. Minimize incidental catch and handling of oversized sturgeon. Ensure that development and other non-fishery, human related activities do not occur in habitat (space and time) or result in direct mortality that may result in negative impacts.
