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Records

  • Title

    Fall Midwater Trawl Survey [FMWT]

    Lead California Department of Fish and Wildlife [CDFW]
    Description The FMWT was initiated to determine the relative abundance and distribution of age-0 striped bass (Morone saxatilis), delta smelt (Hypomesus transpacificus), longfin smelt (Spirinchus thaleichthys), American shad (Alosa sapidissima), splittail (Pogonichthys macrolepidotus), and threadfin shad (Dorosoma petenense) in the estuary. FMWT has sampled annually since it's inception in 1967, with the exceptions of 1974 and 1979, when sampling was not conducted. The FMWT samples 122 stations each month from September to December and a subset of these data is used to calculate an annual abundance index.
    Science topics Stage, Mysis, Other zooplankton, Water temperature, Turbidity, Chinook Salmon, Steelhead Trout, Green sturgeon, White Sturgeon, Delta Smelt, Longfin Smelt, Sacramento Splittail
    Updated April 29, 2022
  • Title

    Summer Townet Survey

    Lead California Department of Fish and Wildlife [CDFW]
    Description The Summer Townet (STN) Survey was initiated in 1959 to determine relative distribution and abundance of young of the year (age-0) striped bass (Morone saxatilis) in the Delta. To predict fishery recruitment, the survey calculates an index to measure age-0 striped bass year class strength. This index is based on abundance when age-0 striped bass attain a mean length of 38.1 mm. In contrast, the delta smelt (Hypomesus transpacificus) index is the average of the first two survey indices. The delta smelt index was developed about 1990 in response to declining delta smelt abundance. It has proven valuable in gauging the health of the estuary;delta smelt abundance trend data was used as supporting evidence for their listing as threatened in 1992 under the Federal and State Endangered Species Acts. It appears that zooplankton data are also collected.
    Science topics Mysis, Other zooplankton, Main channels, Sloughs, Chinook Salmon, Steelhead Trout, Green sturgeon, White Sturgeon, Delta Smelt, Longfin Smelt, Sacramento Splittail, Striped bass, Fish
    Updated April 29, 2022
  • Title

    Zooplankton Study

    Lead California Department of Water Resource [DWR]
    Description The Zooplankton Study has estimated the abundance of zooplankton taxa since 1972 as a means of assessing trends in fish food resources from eastern San Pablo Bay through the eastern Sacramento-San Joaquin Delta and Suisun Marsh. The study also detects and monitors zooplankton recently introduced to the estuary and determines their effects on native species. Under the auspices of the Interagency Ecological Program for the San Francisco Estuary and mandated by Water Right Decision D-1641, the Zooplankton Study is part of the Environmental Monitoring Program and is conducted by the California Department of Fish and Game (CDFG), California Department of Water Resources (CDWR), and the United States Bureau of Reclamation. The Zooplankton Study currently samples 19 stations monthly, including 17 fixed stations and 2 floating entrapment zone stations located at bottom electrical conductivity (EC) of 2 and 6 mS/cm. Three additional stations are sampled in Carquinez Strait and San Pablo Bay during high outflow when surface EC is less than 20mS/cm.
    Science topics Mysis, Other zooplankton, Main channels, Sloughs, Crustaceans, Invertebrates
    Updated April 29, 2022