Fish raised in offshore cages and coastal pens could become a more sustainable source of protein for humans than wild fish or beef. Global demand for protein is rising steadily, yet fisheries are maxed out and beef production uses large amounts of land, fertilizer and freshwater. For fish farms to be more sustainable, they must work to limit excrement and lower the amount of wild fish needed as feed for captive fish. Kona Blue Water Farms in Hawaii is raising kampachi, and Huon Aquaculture Group in Australia is raising salmon.

Slide Show: The Fish Farm Revolution