The Inside Sport Fishing crew venture to Bahia de Magdalena, Mexico on a scientific mission to catch and tag big Striped Marlin. Regarded as one of the planets most productive Striped Marlin fisheries, these massive predators can be found smashing surging balls of baitfish throughout the bay. Such abundance of a relatively threatened species makes Magdalena Bay the perfect sample for an important Billfish study. By placing satellite tags into the line caught fish, the scientists aboard the Kelsey Lee can observe the mortality rates of Marlin released from different style hooks. Upon reviewing the data, the crew discover a disturbing truth about a certain piece of tackle, something that would change the sport of marlin fishing in days to come.