- Division of Environmental Services
- Office of Water Quality
- Environmental Water Quality and Estuarine Studies Branch
- Aquatic Ecology Section
- Bay-Delta Monitoring and Analysis Section
- Environmental Real Time Monitoring and Support Section
- Special Studies Research Section
- Interagency Ecological Program
Contact UsKaren Gehrts, Chief
Environmental Water Quality and Estuarine Studies Branch
3500 Industrial Blvd
West Sacramento, CA 95691
Phone: (916) 375-4825
Predation by non-native fishes is one of the hypothesized contributors to the Pelagic Organism Decline in the Sacramento-San Joaquin Delta, in addition to effects of water diversions, habitat deterioration, and changes in the food web, among others. Even though predation is a natural process and predators have always been in the Delta, abundance of some introduced predators have increased in recent years and may have important impacts on native fishes.
Our recent studies have focused on the distribution, abundance, and diet of largemouth bass, Micropterus salmoides. Additionally, Mississippi silversides, Menidia beryllina, are being investigated as a possible predator of larval Delta smelt, Hypomesus transpacificus.