The world population continues to grow, and at the same time, the per capita consumption of seafood is constantly increasing. To meet the growing demand, the first step was to decimate natural fish stocks through a ruthless fishing industry. To mitigate this effect, but also, and probably primarily, to open up new areas of profitability, a rapidly growing industry has invested in aquaculture. However, aquaculture cannot grow infinitely either. More or less suitable areas on land and along coasts have become scarce. In addition, prices for fish meal and fish oil from a special type of fishing for feed in fish farms keep increasing, a clear sign that a crucial raw material is becoming scarce. The growth of aquaculture has long passed its peak [1], and global warming will impose additional limits.