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In 1970, the entire fishing industry in the St. Clair River, Lake St. Clair, the Detroit River, and Lake Erie had to be closed due to toxic levels of mercury found in the water.

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In 1970, the entire fishing industry in the St. Clair River, Lake St. Clair, the Detroit River, and Lake Erie had to be temporarily closed due to toxic levels of mercury found in the water.

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