The Marlin is the biggest, fastest, and most dangerous gamefish in the sea. They top speeds of 60 miles per hour on migrations that can span 9,000 miles. The largest can weigh over 1,000 pounds. Hemingway immortalized them in "The Old Man and the Sea." Award-winning filmmaker, Rick Rosenthal, spend two years traveling the globe in a quest to document the lives of these awe-inspiring predators.