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  • Title: Projecting Fish Mercury Levels in the Province of Ontario, Canada and the Implications for Fish and Human Health.
    Author: Gandhi N, Bhavsar SP, Tang RW, Arhonditsis GB.
    Journal: Environ Sci Technol; 2015 Dec 15; 49(24):14494-502. PubMed ID: 26592742.
    Abstract:
    Fish mercury levels appear to be increasing in Ontario, Canada, which covers a wide geographical area and contains about 250 000 lakes including a share of the North American Great Lakes. Here we project 2050 mercury levels in Ontario fish, using the recently measured levels and rates of changes observed during the last 15 years, and present potential implications for fish and human health. Percentage of northern Ontario waterbodies where sublethal effects of mercury on fish can occur may increase by 2050 from 60% to >98% for Walleye (WE), 44% to 59-70% for Northern Pike (NP), and 70% to 76-92% for Lake Trout (LT). Ontario waterbodies with unrestricted fish consumption advisories for the general population may deteriorate from 24-76% to <1-33% for WE, 40-95% to 1-93% for NP, and 39-89% to 18-86% for LT. Similarly, Ontario waterbodies with do not eat advisories for the sensitive population may increase from 32-84% to 73-100% for WE, 9-72% to 12-100% for NP, and 19-71% to 24-89% for LT. Risk to health of Ontario fish and humans consuming these fish may increase substantially over the next few decades if the increasing mercury trend continues and updated advisories based on continued monitoring are not issued/followed.
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