What is the confirmed primary location for reproduction within the Sacramento-San Joaquin system?
Answer
A specific reach of the middle Sacramento River, with confirmed reproduction also occurring in the San Joaquin River itself.
The Sacramento-San Joaquin system represents the southernmost extent of the species' native spawning population. While the overall estuary complex, including the San Francisco Bay, is where adults and subadults reside when not spawning, the critical reproductive focus lies upstream in the main river channels. The primary area confirmed for successful spawning activity is a defined section of the middle Sacramento River. Furthermore, documentation supports that reproductive activity also takes place within the San Joaquin River itself, indicating dual importance for recruitment within the system.
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