Open ocean aquaculture has many problems

Open ocean aquaculture (OOA) of carnivorous fish is worse than over-fishing, to produce one pound of farmed tuna takes over ten pound of wild-caught fish. The species usually used as feed are anchovies, menhaden and sardines, these species are important as a source of protein in the third-world countries and an important source of omega-3 fatty acids.

Anchovy, menhaden and sardines are important "cleaners" of the ocean, farmed carnivores have higher levels of organic pollutant than the wild-caught fish. Another issues with OOA are that it promotes disease in wild populations by acting as a reservoir of infection. Escaped farm fish interbreed with wild fish, producing young with lowered rates of survival. Read more...