Up here 35 years ago the DNR considered using them for bullhead control.
They put them in a small lake , although it has an outlet, to see how it worked.
Well Lake Richardson went from a survey of hundreds of small black bullheads to within 20 years zero black bullheads.
The latest survey last year scored 3 larger blackbull heads and 12 large Carp which also used to show hundreds of small ones .
The DNR decided to use channel cats instead but a lot people who fish the lakes they have been put in wish they had not.
Talking to cat fishermen on a fish forum they said the Flatheads in there should be around 30 pounds by now.
the area in that lake where cats would probably be, it has a deep fifty foot hole, cannot be reached from shore so I am looking for a cheap small boat with motor as I want to go there and see what is there.
It connects to another lake with a creek a few tens of feet long and the bullhead population there has dropped also from hundreds of small ones to a total of 26 but one was over 20 inches long, the the Carp population in that lake dropped from 659 ten years ago to 31 the smallest which was a foot long; the survey did show a lot of large black and white crappies, Black 15 inches long, White 12 inches long, which is worth going for all by themselves.