The Porbeagle has a secondary longtitudial keel on either side of the tail which the Mako Shark does not. Also the dorsal fin as a white banding along the back edge, which again a Mako Shark does not have. May occasionally have a smattering of white spots. Has single longitudinal keel on the side of the tail root. There are no white spots above the lateral line.
Upper body is cobalt blue with a white belly.
The characteristic of this shark is the long pectoral fins which allows the Blue Shark to glide along the ocean currents. The inside of the mouth is black, which is the distinguishing feature between this species and the Bull Huss Sycliorhinus stellaris and Lesser Spotted Catshark Sycliorhinus canicula . The upper and lower sides of the body are grey to dark brown and support a series of well defined saddle blotches and circular spots. These patches vary in number with age and juveniles tend to have less than mature fish. This is a nice 17lb Starry Smoothound just prior to coming into the boat for measuring and weighing and a picture of Sue with the same fish just prior to release.