Well if you want to get rid of them I would keep everyone you catch. If large enough to eat, I would do that as well, they are tasty little critters.
I have the same issue with my pond and the bass I believe have started doing there work, or at least I will find out in the next few weeks when I get to fish it heavy.
If you know someone that likes to catfish GSF are the best bait and many will pay top dollar for them.
You may even be able to work out something with the local bait shop.
If they just swapped you pound for pound with some FHM, at least you are getting something for them.
I am in the process of doing this myself, as the GSF I have in my pond are much healthier than what the bait shop gets from their supplier.
