While I think you ask some interesting questions, these are things that the biologists really need to answer. Asking here is fine, but none of us are really qualified to answer those questions. I like WB too. I recognize that they are cyclitic (good some years, not so many other years). Some lakes in KY that used to have good populations of WB now don't. Others seem to have good populations of them. I doubt there is any one factor.
Andrew



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