By farming fish and seafood, we can produce a cheaper product, just like farming cattle, chicken, corn or other food products. And in certain instances, like shrimp, we can reduce environmental impacts on the ocean, while producing an equivalent product (shrimp are commonly caught by scraping the ocean floor with a net, ruining coral and ocean ecology). And farming fish like tilapia and catfish can be very efficient inland. Open-ocean farming of fish like salmon, which also produces cheaper fish, can be problematic to local fish populations as the close quarters lead to increased disease and transmission of disease and other problems like sea-lice. And escaped salmon in ocean fisheries have decimated populations of wild salmon by interbreeding.
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