Land-based aquaculture is currently huge interest to investors. Atlantic Sapphire has built a major salmon farm at an inland location near Miami and several other well-financed are set to follow in the company's footsteps. Conventional coastal salmon farming companies have mastered the art of using recirculating aquaculture systems (RAS) to grow large smolt that can spend less time in the sea. But RAS could be a panacea for a host of new species that can be grown around the world. We explore this new innovation, from crayfish in China and Taiwan to yellowtail seriola farms in the Netherlands.