Given the natural limits to capture fisheries production, it is clear that aquaculture will have to meet most of the future increase in demand for fish (Bostock et al., In 2021, world fisheries and aquaculture production is projected to be about 172 million tonnes, which is a 15% increase from the average level for 2009-11. The OECD-FAO Agriculture Outlook projects that by 2023 (compared to a baseline of 2013) aquaculture will grow by 38% compared to 2% growth of capture fisheries (OECD/FAO, 2014). In many places, this is for good reason. Current evidence indicates that more than a quarter of fish stocks are overfished, with the rest increasingly being fished at their maximum capacity (Figure 1.1). This indicates that the pressure placed on fish stocks is significant, and sometimes excessive.