Summary: Context… Monitoring Goals… Methods… Results and Comparisons 2010 vs 2003 - Fish Size, DDT Skin-on vs Skin-off preparation method Other Contaminants.

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Presentation transcript:

Summary: Context… Monitoring Goals… Methods… Results and Comparisons 2010 vs Fish Size, DDT Skin-on vs Skin-off preparation method Other Contaminants Conclusions

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

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   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   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

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

  Total DDT levels in lake trout from 2010 remain high.   DDT levels are higher than those in 2003.

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

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

Conclusions   Total DDT levels in lake trout from 2010 remain high. Levels are higher than they were in   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   Ecology - Fish Tissue Monitoring: Keith Seiders, ,   Health – Fish Consumption Advice: Dave McBride, ,   Ecology Web site Toxic Hazards:   Health Web site - Environmental Health:

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.