I would have to concur with Dave's answer.
Having been through an over abundance of really large and troublesome catfish, I would caution anyone about adding many more than will be taken out annually. We typically remove 15-20 that are 18-22 inches. I find that annually adding 20-25 catfish, that are 10-14 inches, is just about right for my 0.8 acre pond, and for the way we harvest the fish. I don't know what happens to the other catfish, I assume they have died a natural death, or else they are lurking in the depths getting fatter and fatter.
Good luck,
Ken
