Smaller Fish are Better

If we want to maximize the amount of fish produced per unit of feed, smaller fish are better. Also, of course the types of fish make a big difference: some, like trout and catfish, are more sustainably farmed. Finally, a lot of meat goes to waste because it's not in the large, easy to serve fillets. Smaller pieces are found in the collar, belly, and tail, but it's not as easy to extract and serve. As the first article points out, the key is that much of aquaculture relies on feeding wild fish to farmed fish, which is of course ultimately unsustainable. Recently some aquaculture has succeeding while feeding pellets of corn and soy to tilapia, which seems a step in the right direction.