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Title

Mercury Trends in Freshwater Fish, 2011 Sampling Results

 
Publication number Date Published
12-03-051October 2012
VIEW NOW: Mercury Trends in Freshwater Fish, 2011 Sampling Results (Number of pages: 10) (Publication Size: 351KB)




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Author(s) Mathieu, C. and M. Friese
Description The Department of Ecology analyzed 70 individual fish and 19 fish tissue composites from 6 freshwater lakes as part of the seventh year (2011) of a long-term monitoring program to assess temporal trends in mercury levels of freshwater fish in Washington State.

Individual bass mercury concentrations ranged from not detected (16.5 U) to 607 ppb. All fish tissue samples met the National Toxics Rule water quality standard for mercury (770 ppb). Statistical tests indicated no difference in fish mercury levels between 2006 and 2011 for individual fish from Mason, Meridian, Moses, and Offutt Lakes. Mercury levels in Newman Lake bass were 7% and 10% lower in 2006 and 2011 compared to data from 2002. Lake Sammamish bass mercury levels were 5% higher in 2011 than 2006.
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Contact Callie Mathieu at 360-407-6965 or callie.mathieu@ecy.wa.gov
Keywords toxics monitoring, fish, trend, mercury, PBTs, lake
WEB PAGE Mercury in fish tissue
WATERSHED Water Resource Inventory Areas
(WRIA 08,WRIA 09,WRIA 13,WRIA 14,WRIA 41,WRIA 57)
DATA Environmental Information Management (EIM) #HgFish11

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