Norm,
I have raised hundreds of thousands of catfish. They become good predators around 2 lbs. Especially if they are not fed often. The blues do grow larger. However the channel and channel/blue cross are preferred by most people for eating. A few years ago I had a 750 gal. aquarium in my office. Two of the fish I put in the aquarium were a 6" albino channel cat and a 7" largemouth bass. A year later the cat was about 2 lbs. and the bass was about 1.5 lbs. I would buy 100 large feeder goldfish each week. The channel would eat more goldfish than the bass every time. The channel or cross also tend to be easier to catch. Your pond. You decide. Good luck.
