Ok, I have an 8 arce pond with grass carp in it. They were stocked 20 years ago. A few years after the grass carp were stocked we stoped catching catfish. This spring I just caught a baby grass carp on a lurer. I thought they were not suposed to reproduce in ponds? Today I caught a 30+ pound grass carp on a trot line, using a little bluegill. Before the grass carp were stocked we were catching 20+ pound channel cat. Now we dont catch any channel cats. So now I know that grass carp reproduce in my pond, eat little bluegill, live for more than 20 years, and have a negitive effect on my catfish. Has anyone else had this problem?