However, zebra mussels and other non-native species are credited with the increased population and size of smallmouth bass in Lake Erie and yellow perch in Lake St. Clair.They cleanse the waters of inland lakes, resulting in increased sunlight penetration and growth of native algae at greater depths. This cleansing also increases water visibility and filters out pollutants. Each quagga and zebra mussel filters about 1 US quart (0.95 l) of water a day when confined to small tanks. In lakes, their filtering effects are usually spatially restricted (near the lake bottom) due to non-homogeneous water column mixing.
See Also: http://livingstingy.blogspot.com/2014/07/invasive-species.html