I have some nice size catfish about 7 to 9 pounds and starting this past spring I have lost about 52 of these fish. When I think it is all over I will lose one more. I went about 2 weeks this time and maybe more before losing another cat fish. The smaller catfish are not bothered just the larger ones. The larger cat fish when harvested have a very firm meat in fact it is tough. We tried different methods of cooking and they were still tough. At least 2 1/2 acres , aerated with a depth of about 6 feet. The fish eat very good from 2 automatic feeders.