Farmed fish could bring us cheaper food, but is it ethical?

US food company Cargill wants to use expertise from the farmed salmon sector to help it produce more efficient and sustainable fish and chicken

It is difficult to know which is moving faster: the debate around the ethics of farmed fish, or the growth in how much of it we are eating. By 2030, aquaculture is predicted to account for 60% of fish destined for our plates and it's already more than half.

Its rapid growth has led some to predict its success in producing cheaper fish could rub off on the meat sector, giving us a more efficient, but not necessarily more ethical, form of protein.