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The Enhanced Delta Smelt Monitoring Program (EDSM) provides weekly fish population and environmental data for the upper San Francisco Estuary from 2016 onward. U.S. Fish and Wildlife Service field staff sample between 18 and 41 sites weekly using larval and Kodiak trawls, identifying and measuring fish while recording water temperature, conductivity, dissolved oxygen, turbidity, and depth. This long-term dataset tracks the endemic Delta Smelt and can be used to evaluate trends in other pelagic fish species.
Primary data formats are XML and API, which may require specific parsing tools.