I think one of the advantages is they are primarily herbivorous which makes them less costly to raise. If you feed it becomes costly. I kept bass as pets yrs ago fed them beef heart. They grew to about 5 lbs before I put them back in the creek. They grow very rapidly on beef heart. So much of the dry food is filler and produces a lot of poop and slow growth. I know I'm going to get flack for saying it. Worried make a beef heart mix with peas, squash, sweet potatoes, throw in some spirolina freeze it.