Increased wealth in many regions and an ever-growing population have produced an unprecedented demand for fish. This increased demand is occurring at a time when over 70% of the world's marine fish stocks are now overfished or already fished at full capacity. One possible solution is the continued expansion of aquaculture, a long-standing means of farming fish for human consumption. Controls must be put into place, however, to manage the potential environmental risks associated with fish farming, such as water pollution and transmission of disease to adjacent wild fish populations. Moreover, the aquaculture sector has yet to devise effective methods for rearing some commercially popular predator species, such as tuna, without having to feed them wild-caught fish, which contributes to the pressure on our oceans.