Interagency Ecological Program Spring Season report
- Splittail are a native minnow that spawn on floodplains, so have high reproduction during high flow years when floodplains are inundated with water. They are sampled by DWR’s Yolo Bypass Monitoring Program.
- Spring-run Adult salmon returns return from the ocean during the spring. Populations are calculated by CDFW’s Fisheries Branch based on redd counts, carcass surveys, fish entering hatcheries, and live fish counts.
- Juvenile Winter-Run Chinook Salmon out-migrate to the ocean in spring, and are sampled by the USFWS’s Chipps Island Trawl, located at the confluence of the Sacramento and San Joaquin Rivers.
Average fish abundance by species
2018 was lower than the long-term average.
In 2018, adult Chinook returns were lower than average
In 2018, juvenile winter-run salmon survival was about average.
For more information see: Kwan, N., J. Jenkins, C. Stuart, A. Shakya, and B. Schreier. 2019. 2011-2016 Yolo Bypass Fisheries Monitoring Status and Trends Report. IEP Newsletter 36(1):27-36.