Fish farming is the fastest-growing form of food production. Seafood accounts for about a sixth of the world’s protein intake—but the ocean only has so much to give
Fish farming is the fastest-growing form of food production in the world. Seafood accounts for around 17% of the world’s protein intake . The, a rich-country club, reckons that, thanks to population growth and rising incomes, global consumption of fish will reach 180m tonnes by the end of the decade, up from 158m tonnes in 2020.
As with farming on land though, aquaculture can cause environmental damage. Many farmed fish are grown in net pens, either in rivers or the open ocean. Uneaten food and fish waste can pollute the surrounding waters. When net pens break, escaped farmed fish can damage the local ecosystem. Inland “flow-through” farms require continuous streams of freshwater from rivers or wells, competing with those who might wish to drink it instead.
system grows fish on land in tanks whose water is continuously cleaned and recycled. That offers three big advantages. Compared with standard aquaculture systems,farms use far less water, can take better care of their fish, and can allow picky species to be raised anywhere in the world.farms are, in essence, much bigger versions of home aquariums. Each consists of a tank in which the fish swim, and a set of water-cleaning components to dispose of the waste that they produce.
Concentrating the waste in one place offers advantages of its own. One of the biggest missed opportunities with standard aquaculture, says Kari Attramadal, head of research at Nofitech, another Norwegian aquaculture firm, is that the waste released into the environment from standard fish farms contains plenty of valuable nutrients. Nitrates can be used as food for hydroponically grown crops.
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