“It seems like there are always yellowfin and mahi around,” says Beto Mejia, with Fish Colombia of Darien Lodge and other fishing resorts. Unlike fishing resorts in many other South and Central American countries, which must make runs of 15 or 20 miles, pelagics are a very short run off the beach. Meija says lodge captains are removing otoliths (ear bones) of yellowfin, recording sex and otherwise gathering data to help scientists track the tunas’ movements.