farmed fish

There are 161 fewer U.S. aquaculture farms than earlier this decade but their sales are up more than 10 percent, to $1.5 billion, according to USDA's Census of Agriculture. The 2,932 farms had average sales of roughly $517,000 apiece. Those farms occupy a combined 484,000 acres, or 756 square miles, divided nearly equally between freshwater and saltwater production.

If the world utilized every appropriate ocean habitat for aquaculture, it could outproduce the global demand for seafood by 100 times, says a study by scientists at the University of California-Santa Barbara in the journal Nature Ecology & Evolution.