I just bought some Atlantic salmon, a product of Chile:
I thought, "Huh?" Chile is on the Pacific Ocean side of South America. But then I checked, and indeed down near Isla Grande de Tierra del Fuego, Chile does appear to reach over to the Atlantic Ocean.
But that is likely irrelevant when it comes to Atlantic salmon. These salmon filets are almost surely from salmon farms in Chile. From Wikipaedia,
Aquaculture is a major economical activity in Chile. Among the diverse aquacultures practised in Chile Atlantic salmon aquaculture is the overwhelmingly largest sector. Until 2007 Chile experienced over 15 years a huge growth in its salmon aquaculture becoming the second largest salmon and trout producer after Norway. By 2006 Chile contributed with 38% of the worlds salmon volume just behind Norway that produced 39% of it. In 2006 salmon from Chilean aquacultures was the third largest export product in terms value, representing 3,9 of Chilean exports...