Farming Fish?

When it comes to fish farming, there are a lot of various ecological issues to take into account. Each species of fish has different requirements, and these are the things that lead to problems down the road. Farmed salmon are kept in pens that are permeable by the surrounding ocean. This allows for the transfer of pollution, diseases and other things to the wild species in the area. However, some fish like catfish have much lower requirements, and can easily be kept isolated from other fish. Therefore, that is why there are much more critics, such as the World Wildlife Fund, for farming salmon than catfish.