here in ft wayne we have 2 rivers that combine to make one. both lower rivers have flatheads but the one thats farthest up stream has none. the upper most river has channels and bullheads. there are no bullheads in the lower two rivers,at least i never caught any. do you guys think the flatheads eat up any and all the bullheads washed through the dam as soon as they come over? do you think the rivers have changed so much from the dams in a hundred years to be so diverse? last year we had major flooding here and the dams were completely overflowed. do you guys think its possible that some flatheads swam over the dam even in the dead of winter?