The last few years I've been reading that scientists are discovering that what regulates yearly cycles of nature more than anything is the length of daylight. That seems to control what plants and animals do, and when they do it, more than any other factor.
I've carefully watched water temperatures for a long time trying to figure out when spawning runs will happen. For white bass, crappie, and walleye I've found that water temp doesn't seem to be a real good predictor. I'm sure temperature is a factor - but I think the length of the days, and maybe also weather patterns coming through, gets the fish going more than just the water temperature.
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