Interagency Ecological Program: Over four decades of juvenile fish monitoring data from the San Francisco Estuary, collected by the Delta Juvenile Fish Monitoring Program, 1976-2019

The United States Fish and Wildlife Service Delta Juvenile Fish
Monitoring Program (DJFMP) has monitored juvenile Chinook Salmon
Oncorhynchus tshawytscha and other fish species within the San
Francisco Estuary (Estuary) since 1976 using a combination of surface
trawls and beach seines. Since 2000, three trawl sites and 58 beach
seine sites have been sampled weekly or biweekly within the Estuary
and lower Sacramento and San Joaquin Rivers. As part of the
Interagency Ecological Program (IEP) that manages the Estuary, the
DJFMP has tracked the relative abundance and distribution of naturally
and hatchery produced juvenile Chinook Salmon of all races as they
outmigrate through the Sacramento-San Joaquin Delta for over four
decades. The data that DJFMP collected has been used not only to help
inform the management of Chinook Salmon, but also to monitor the
status of native species of interest such as the previously listed
Sacramento Splittail Pogonichthys macrolepidotus and invasive species
such as Mississippi Silverside Menidia beryllina and Largemouth Bass
Micropterus salmoides.

For more information:
https://www.fws.gov/lodi/juvenile_fish_monitoring_program/jfmp_index.htm