Salmon sold in the United States are found either in the Atlantic or Pacific oceans. Salmon from the Atlantic are typically farm-raised, while those from the Pacific generally are wild-caught. Experts say there are no major differences in taste between the two. The salmon's journey to market (which can involve more than 1,000 miles of swimming) is quite remarkable. According to the World Wildlife Fund Canada, salmon are considered anadromous, meaning they spend time in both fresh water and saltwater. Very few fish can tolerate both environments and survive, but salmon have made the appropriate adaptations.