A diver at the Snapperfarm fish farm is dwarfed by a so-called SeaStation fish-farm cage off Puerto Rico in an undated photo. Snapperfarm is one of only a handful that raise high-value saltwater finfish in the clear, deep waters of the open ocean.
The practice mitigates pollution, disease, and other problems of near-shore operations. But its challenges are also unique. Open-ocean equipment must withstand far tougher conditions, and bringing a catch to market requires more effort.