To meet a rapidly growing demand, Atlantic salmon farming first emerged on a large scale in the early 1980s, with Norway leading the way. Since then, global production has increased tremendously. Today, Atlantic salmon are farmed in more than a dozen countries in Latin America, Europe and North America. The fish are typically raised in large, floating netpens, which are usually located in open bays. Farmed Atlantics start at four pounds, but can grow as large as 18 pounds.