Natural ebbs and flows are very complicated. About 20 years ago Lake St Clair, between Detroit and Windsor Canada was invaded by a small mussel called a zebra mussel. They were very effective at clearing the water because they are filter feeders. As a result, water clarity improved substantially, and two things happened. Number one the Musky fishing in Lake St Claire has become spectacular. Secondly, Great Lakes Canvasback shooting has become substantially better, because natural plant life has improved substantially, and the cans are now feeding on the grass rather than mussels.
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