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Dead fish washing up on Lake Simcoe's shores

Residents at the south end of Lake Simcoe are holding their noses after thousands of dead fish washed up on the shore near Keswick over the past week.
Dead fish are washing up on the shores of Lake Simcoe. 1:56

Residents at the south end of Lake Simcoe are holding their noses after thousands of dead fish washed up on the shore near Keswick over the past week.

Environment officials are trying to determine what is causing the fish to die.

Click on the video link above to watch Lucy Lopez's story.