Ken, first, that is a big cat! I'm assuming a channel cat but my cat experience is little to none.
As DIED said, that LMB is dam skinny. I kind of feel bad for him. No wonder your bass are eating processed meats.
I think you are right to try and get rid of the two super-large grass carp. Can you bow-fish
them out, or do you know anyone who can? Maybe get all four of them; as you mentioned, you can get more anytime.
Don't let Sally Struthers see that LMB picture.
