Deep Sea Fishing Charters in Marathon, FL for Trophy Sailfish, Swordfish, Mahi, & much more! Big Game Sportfishing, a fully licensed and insured fishing charter, is the ultimate choice for charter fishing in the Florida Keys. Climb aboard the Big Game boat, captained by Ariel Medero, a highly accomplished fishing captain and licensed United States Coast Guard captain with 25 years of experience in the waters of Marathon, Florida.