Primary Driver: Exposure of Fish
This primary driver is affected by the two secondary drivers shown above.
The exposure of fish to low DO concentrations in the DWSC results from the combined timing of when these low-DO episodes typically occur and when the fish typically pass through the DWSC (migrating either upstream or downstream). See "Secondary Driver: Occurrence of Sensitive Life Stages in the Stockton Deep Water Ship Channel" for a graphic that shows when the life stages of each species occur in the DWSC as well as when episodes of low DO concentrations occur. This information is also depicted individually for the eight fish species that are the subjects of this model.
More information on the conditions that lead to low DO conditions is provided in the physical/chemical model.