Sharks are a group of elasmobranch cartilaginous fish characterized by a ribless endoskeleton, dermal denticles, five to seven gill slits on each side, and pectoral fins that are not fused to the head. From Wikipedia
The endurance swimmer’s 62-mile journey around the island, marking the 50th anniversary of 'Jaws,' highlights the ecological importance of sharks and the urgent need for their protection.
