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The gobs of algae that lined the shores of the Great Lakes in the 1960s are now reappearing. Four decades ago, a crackdown on phosphorus pollution repelled the invasion, but today, the problem is believed to result from the water-filtering activity of zebra and quagga mussels. An algae bloom is not only an aesthetic problem; swimmers who swallow algae-choked water can get sick, and algae can reduce oxygen levels in water, killing fish.