Interagency Ecological Program: Over four decades of juvenile fish monitoring data from th

Over four decades of juvenile fish monitoring data collected by the Delta Juvenile Fish Monitoring Program (DJFMP) since 1976. The United States Fish and Wildlife Service program uses surface trawls and beach seines, sampling weekly or biweekly at three trawl and 58 beach seine sites since 2000. It tracks the relative abundance and distribution of juvenile Chinook Salmon and other species in the Sacramento-San Joaquin Delta.

Use Cases

• Modeling juvenile Chinook Salmon outmigration patterns based on decades of relative abundance data.
• Monitoring population trends of native species like the Sacramento Splittail based on long-term survey records.
• Tracking the spread and impact of invasive species like Mississippi Silverside based on distribution data.
• Analyzing seasonal and interannual fish distribution changes based on geospatial sampling site data.

Strengths

• Data collection spans over four decades, starting in 1976.
• Sampling includes a consistent network of 3 trawl and 58 beach seine sites since 2000.
• Focuses on multiple species, including Chinook Salmon, native species of interest, and invasive species.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

United States Fish and Wildlife Service Delta Juvenile Fish Monitoring Program (DJFMP), part of the Interagency Ecological Program (IEP).

Collection Method

Data collected using a combination of surface trawls and beach seines.

Time Range

1976 to present.

Freshness

Last updated 2026-04-14 16:43:31.800500; freshness should be verified.

Geography

San Francisco Estuary and lower Sacramento and San Joaquin Rivers.