There is only just channel catfish, everyone added the blue part because they couldn't tell the difference between a channel cat, and a blue cat, hence a blue channel catfish, but now there's a twist. There is a hybrid of the two, and technically it could be called a blue channel catfish, but what is seen in the hobby is a normal colored channel catfish(commonly refered to as blue channel catfish), and the albino version(sometimes called a golden channel catfish).