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“Our waters, our fish, our people” Mercury contamination in fish resources of two Treaty #3 communities.

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Presentation on theme: "“Our waters, our fish, our people” Mercury contamination in fish resources of two Treaty #3 communities."— Presentation transcript:

1 “Our waters, our fish, our people” Mercury contamination in fish resources of two Treaty #3 communities

2 Research Question Do our fish still contain high levels of Hg? Is it possible that some fish species in some lakes are clean enough to eat? How much fish can we eat without the fear of Hg poisoning? Can we set up a monitoring program ourselves to check the Hg levels in fish?

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7 Walleye

8 Clay Lake Trendline length (cm) Ball lake Clay lake Garden lake Indian lake Maynard lake Separation lake Tide lake Whitefish

9 Bass

10 Clay Lake Trendline length (cm) Ball lake Clay lake Indian lake Garden lake Separation lake Tide lake Maynard Northern Pike

11 Hg in Clay Lake Species Scott (1974)Present study (2003) N Avg Hg (mg/kg) length range(cm) N Avg Hg (mg/kg) Length range(cm) Walleye Northern Pike Whitefish

12 Hg in Walleye from Ball Lake Year N Hg (mg/kg) Present study (2003)

13 distance downstream from Dryden (miles) Concentraton Hg (ug/g) 1973 Indian Lake Ball Lake Clay Lake Tetu LakeIndian Lake Ball Lake Clay Lake 2003 Mercury Contamination in Walleye

14 Table 20: Average Hg Levels Fishing Popularity of Specific Lakes Grassy Narrows LakeAverage Level of Hg # Participants Fishing (% of Population) Clay (13%) Ball (34%) Tide (45%) Indian (68%) Seperation (74%) Garden (85%) Maynard (89%)

15 Table 1: Participant Profile of Each Community Grassy NarrowsGN %WabaseemoongWD % Total n87100%55100% Sampled5260%4175% Volunteered3540%1425% Male5159%2138% Female3641%3462% %3564% %1629% %47%

16 Distribution of Average Fish Intake – Grassy Narrows

17 Table 20: Average portion size for a fish meal (g/meal) (mean ± SD) Grassy Narrows Walleye276 ± 134 Whitefish232 ± 167 Bass255 ± 192 Northern Pike180 ± 145

18 Average Fish Intake - Grassy Narrows By Gender Group

19 Average Fish Intake - Grassy Narrows By Age Group

20 Average Mercury Exposure by Age and Gender Group – Grassy Narrows

21 Distribution of Mean Hair Mercury Concentrations – Grassy Narrows

22 Estimated Mercury Exposure and Measured Hair Level - Grassy Narrows

23 Profile of participants with high Hg intake in Grassy Narrow Participant Mean Hair Hg (ppm)AgeGender Average Fish Consumption (g/day) Estimated Hg Exposure (ug/kg body wt/ day) GN Male100.3 GN Male2760.7

24 Recommendation Grassy Narrow Currently, there is no problem with high Hg exposure from eating fish Do not eat fish from Clay and Ball Lake Promote eating more fish, particularly whitefish up to 5 fish meal per week Walleye may be limited to 2 fish meal every 3 weeks for those who are concerned.


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