Here on Lake Conroe, I have caught channel cats every month of the year that had eggs. When they actually spawn is a different matter. I am thinking 80* or so too.
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Rod & Reel PB: Blue Cat 53 lbs/12 lb test, Flathead Cat 78 lbs/20 lb test, Channel Cat 17 lbs 12 lb test, Texas common carp 40 lbs/12 lb test, White crappie 2.8 lbs, Black crappie 2.3 lbs all Lake Conroe