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Lake Chelan Fish Tissue Monitoring: 2010 Results for Lake Chelan Water Quality Committee January 5, 2012 Keith Seiders, Toxics Studies Unit Environmental Assessment Program. Summary: Context… Monitoring Goals… Methods … Results and Comparisons

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Summary: Context… Monitoring Goals… Methods … Results and Comparisons

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Summary context monitoring goals methods results and comparisons

Lake Chelan Fish Tissue Monitoring: 2010 Results for Lake Chelan Water Quality Committee January 5, 2012Keith Seiders, Toxics Studies UnitEnvironmental Assessment Program


Summary context monitoring goals methods results and comparisons

Summary: Context… Monitoring Goals… Methods…

Results and Comparisons

2010 vs 2003 - Fish Size, DDTSkin-on vs Skin-off preparation methodOther Contaminants

Conclusions


Summary context monitoring goals methods results and comparisons

Washington State Toxics Monitoring Program GoalsExploratory monitoring: since 2001. Characterize toxic contaminants at sites that lack data.Long Term monitoring: begin in 2009.Track contaminant levels over time at selected sites.Cooperative/complementary efforts; address new concerns.


Goals of wstmp 2010 sample effort

Goals of WSTMP 2010 sample effort

  • Focus on Long Term Monitoring component

  • Lake Chelan, Wenatchee River, Banks Lake

  • Compare results: Historical vs 2010

  • Compare prep method: skin-on vs skin-off

  • Improve characterization of toxics in tissue

  • Support DOH data needs for review of FCA

  • Involve others: local gov’t, citizens, guides


Lake chelan 2010 effort

Lake Chelan: 2010 effort

  • Mimic 2003 effort to collect/analyze lake trout

  • Time and location: 5/17/03 and 6/3/10 in Wapato Basin

  • Collection: H/L (derby in 2003, local guides in 2010)

  • Fish size: match weight range used in 2003 composites

  • Preparation: skin-on fillets both years (2010 add skin-off)

  • Lab Analyses DDT: EPA 8081 at MEL in 2003 and 2010

  • Lab Used: MEL; EPA-2003; ECY-2010


Results

Results

  • DDT levels: 2010 and 2003

  • Compare skin-on vs skin-off preparation

  • Levels of other contaminants

  • Fish Consumption Advice


Boxplots of the 2003 and 2010 results for t ddt

Boxplots of the 2003 and 2010 results for t-DDT


Summary context monitoring goals methods results and comparisons

Summary of Two-Sample t-Tests for t-DDT in Samples from 2003 and 2010.


Summary context monitoring goals methods results and comparisons

  • Total DDT levels in lake trout from 2010 remain high.

  • DDT levels are higher than those in 2003.


Summary context monitoring goals methods results and comparisons

Summary of Paired-Sample t-Test for Skin-On and Skin-Off Samples.


Summary context monitoring goals methods results and comparisons

  • Different fish preparation methods (skin-on vs skin-off) showed little or no difference in tissue DDT levels.


Conclusions

Conclusions

  • Total DDT levels in lake trout from 2010 remain high. Levels are higher than they were in 2003.

  • Different fish preparation methods (skin-on vs skin-off) showed little or no difference in tissue DDT levels.

  • Lake trout also have high levels of PBDE flame retardants, dioxins/furans, and elevated levels of PCBs.

  • Lake trout in Lake Chelan tend to be good biomagnifiers of environmental pollutants because they are: large, long-lived, fatty, and are at top of food web.


Contacts and websites

Contacts and Websites

  • Ecology - Fish Tissue Monitoring:

    Keith Seiders, 360-407-6689, [email protected]

  • Health – Fish Consumption Advice:

    Dave McBride, 360-236-3176, [email protected]

  • Ecology Web site Toxic Hazards: http://www.ecy.wa.gov/toxhaz.html

  • Health Web site - Environmental Health: http://www.doh.wa.gov/ehp/oehas/fish/


Lab method differences between 2003 and 2010

Lab Method Differences between 2003 and 2010

  • Lipids: different sample prep (extraction solvents). Results not comparable.

  • Dioxins/furans: similar yet different methods. Results comparable for this study.

  • Mercury: different sample prep (rigor of digestion). Comparability of results good for most purposes when conversion factor used for estimations.


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