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Lakes and Reservoirs - Bioaccumulation in Fish and Wildlife

Long-term Monitoring of Bass Lakes (Began in 2015)

The Long-term Monitoring Study (initiated in 2015) will continue to monitor long-term trends in mercury concentrations in lakes dominated by bass (a fish species known to accumulate high levels of mercury). This study will provide updated information on the status of these lakes and a statewide perspective on long-term trends to evaluate effectiveness of management actions (e.g., mercury control plans) as well as the impacts of factors such as increases in global emissions or climate change on fish mercury levels.

Low Concentrations of Contaminants Study (2014)

The Low Concentration Study, conducted in 2014, was designed to identify and characterize 'clean' lakes (those with low levels of mercury and other contaminants in fish) to better inform the fishing public and to gain a better understanding of the factors and conditions contributing to the lower concentrations.

Statewide Lake and Reservoir Survey (2007-2008) - Released 2010

The Statewide Lake and Reservoir Survey, conducted in 2007 and 2008, was California's largest ever survey of contaminants in sport fish from lakes and reservoirs. Popular fishing locations at a total of 272 lakes and reservoirs were sampled throughout the state.

Two-Year Screening Study (2007) - Released 2009

Supporting Documents

  • Monitoring Plan
  • Quality Assurance Project Plan
  • Access to Data
      • Instructions on how to access tissue data
      • Tissue button in the RESULT CATEGORY:
      • Select > Programs > Surface Water Ambient Monitoring Program > Done
      • Select > Projects > SWAMP Sportfish Contamination in Lakes & Resrv > Done
      • Select > Turn on automatic station mapping (stations will be mapped on the map)
      • Select > Map Stations
      • Click on individual stations>
      • Select > Parameter Counts (see data)
      • First, complete the instructions above under: “INSTRUCTIONS ON HOW TO ACCESS THE TISSUE DATA FOR THIS PROJECT”
      • Select > Retrieve Data (as an Microsoft Excel File)
        • Then download (save) data
        • File identified in Cell A:1 > CEDEN: Data Retrieval
        • This file summarizes fish attributes (length, weight, etc.) and the associated chemistry results.
      • To get the individual attributes of the composited fish (no chemistry)
        • Make sure your Pop-up Blocker is turned OFF
        • Include Sample Composite (notice the increase in Record Count)
        • Select > Retrieve Data
          • Then download (save) two data files (will include “Data Retrieval” file)
        • File identified in Cell A:1 > CEDEN: Sample Composite Data
          • This file is the individual attributes of the fish composites (no chemistry data)
  • Year-One Cruise Report [23.0 MB]
  • Year-Two Cruise Report [16.9 MB]

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