I can remember when there was no limit on Crappie in Tennessee, and the possum cops would tell us not to throw any back, no matter how small they were. The TVA lakes were terribly overpopulated, and they figured the only way to let any of them grow to any size was to thin the herd. Then some idiot got the bright idea to stock ocean stripers in fresh water- - - - -those things are eating machines, and the crappie became their primary food source! Bad move!
