look lower on the food chain

The most promising solution of all may be to look lower on the food chain.Instead of cramming large, carnivorous fish into pens,we can work with natural ocean systemsto produce huge amounts of shellfish and seaweeds.These low-maintenance flora and fauna don't need to be fed at all.In fact, they naturally improve water quality,filtering it as they feed off of sunlight and nutrients in the seawater.