Mercury contamination of sport fish in the Delta and its watershed CBDA Fish Mercury Project, Year 1 - PowerPoint PPT Presentation

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Mercury contamination of sport fish in the Delta and its watershed CBDA Fish Mercury Project, Year 1

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Mercury contamination of sport fish in the Delta and its watershed CBDA Fish Mercury Project, Year 1 – PowerPoint PPT presentation

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Title: Mercury contamination of sport fish in the Delta and its watershed CBDA Fish Mercury Project, Year 1


1
Mercury contamination of sport fish in the Delta
and its watershed CBDA Fish Mercury Project,
Year 1
  • Letitia Grenier, Aroon Melwani, Jen Hunt, Shira
    Bezalel, Jay Davis
  • San Francisco Estuary Institute
  • Gary Ichikawa, Billy Jakl
  • California Department of Fish and Game
  • Wes Heim, Autumn Bonnema
  • Moss Landing Marine Laboratories
  • Margy Gassel
  • California Office of Environmental Health Hazard
    Assessment

2
Presentation Overview
  • Scope of captures (how many fish, where)
  • Fish size and mercury
  • Overall mercury impact (all species)
  • Differences between fish species
  • Differences across the Delta watershed

3
Field Collection
  • Late July to mid December 2005
  • California Department of Fish and Game
  • Electrofisher boat and fyke nets
  • Clean handling techniques
  • Length measurements

4
FMP Sport Fish Sampling, 2005
  • 2124 individual fish
  • 24 species
  • 70 sport fishing locations
  • Coordinated sampling
  • Central Valley Regional Water Quality Control
    Board
  • Sacramento River Watershed Project

5
  • Sampling
  • Locations
  • 2005
  • Colors represent different types of sampling
    sites

6
Take Home Message
  • We caught a lot of fish from a lot of sites!
  • This was the most extensive and intensive sport
    fish sampling in this region to date

7
Size of Fish Can Matter
Largemouth Bass
8
Take Home Message
  • For fish of the same species, mercury is often
    higher in bigger fish
  • This is not a bad rule of thumb, even though some
    species and some sites do not show an increase in
    mercury with fish size

9
  • Overall
  • Impact
  • Highest Species
  • Colors represent relative mercury contamination
  • Symbol shapes represent species with highest
    average concentration
  • Size limits applied, minimum sample size is one
    fish

10
  • Overall
  • Impact
  • Lowest Species
  • Colors represent relative mercury contamination
  • Symbol shapes represent species with lowest
    average concentration
  • Size limits applied, minimum sample size is one
    fish

11
  • Relative
  • Impact by
  • Species
  • Colors represent relative mercury contamination
  • Quadrants represent species
  • Gray quadrants mean species not collected
  • Size limits applied, minimum sample size is one
    fish

12
Colors represent relative mercury contamination
13
Take Home Message
  • Different fish species have different levels of
    mercury contamination
  • At the same site, some species may be high in
    mercury, while others are low
  • Remember that this analysis does not take
    organics into account

14
  • Largemouth
  • Bass
  • Colors represent relative mercury contamination
  • Height of bar represents mean concentration
  • Size limits applied, and minimum sample size is
    one fish

15
  • Bluegill
  • Colors represent relative mercury contamination
  • Height of bar represents concentration
  • Size limits applied, and minimum sample size is
    one fish

16
White Catfish
Prospect Slough
Old River at Tracy Blvd
17
Take Home Message
  • The same kind of fish of the same size can have
    different mercury concentrations at different
    locations
  • Some sites in the central Delta tend to have
    lower mercury in most species relative to the
    surrounding rivers

18
Summary
  • Most extensive and intensive sport fish sampling
    in this region to date
  • For fish of the same species, mercury is often
    higher in bigger fish
  • Different fish species have different levels of
    mercury contamination
  • The same kind of fish of the same size can have
    different mercury concentrations at different
    locations

19
Acknowledgements
  • California Bay-Delta Authority
  • Fish Mercury Project
  • Steering Committee
  • Peer Review Panel
  • Co-PIs and Collaborators
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