Blue Shark Identification
* Long slender body
* Dark blue colour on top, bright blue colour on the sides and white underneath
* Very long pectoral fins
* Nictitating membrane over eye
The blue shark has a distinct colouration, a deep indigo blue from above and a vibrant blue on its sides, changing to white underneath.
The blue is a long slender shark, reaching 13 feet (3.8 m) in length.
The large pectoral fins are easy to identify, as they are as long as the distance between the tip of the snout to the last gill slit.
The blue shark has a weak keel
on the caudal peduncle and the upper lobe of the caudal fin is larger than the lower.
The teeth on both the lower and upper jaw have triangular cusps with smooth or finely serrated edges.
The blue shark occurs in the Atlantic, Pacific and Indian Oceans in both inshore and offshore
waters, from 50º N latitude to 50ºS latitude.