With the ever-increasing world population now exceeding 7 billion, urbanization proceeds apace, land and water are restricted, and climate variability has come to affect agriculture, leading to worries of a food crisis. As on-land food production nears its limits, awareness is spreading around the world that we should look to the sea in order to feed the next generation. However, fishery resources have come up against a wall and increased production is not expected. The promising food industry that can see us through this bottleneck is the farming of the sea, or aquaculture, which has seen steady growth since the 1980s.