We get blue/green algae on allot of lakes around here but I've never heard of it killing off the fish. I've found the occasional dead gull and I've heard of it killing a couple of dogs that swam/drank the water. Last year was especially brutal with the low water levels. By our pier it was like a blue/green carpet on the top of the water. Disgusting but no dead fish.
Every year on Lac Lanonne there are dead whitefish floating at this time of year but it's because of the lack of oxygen in the water. You can watch them come up and gulp at the air. It doesn't seem to effect the walleye much though.
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