If it was my pond and you don't have a submerged plant problem I would not touch them. We have had this discussion in the past whether large GC eat as much as young GC. In the past I have had grass carp roughly 3 1/2 feet long and looked to be in the range of 20 to 30 lbs, and it takes calories to make a fish that size go. I watched those large carp eat and they didn't seem any less vigorous then new grass carp I put in last year and this year. I talked to a guy at a fish hatchery that said he saw a large crass carp rip out a large cattail like a bull dog.
I used to feed pellets to my fish and the very large grass carp were hogging there share of food and so again their feeding wasn't slowing down.
Last edited by John Monroe; 08/27/14 01:42 PM.
