The shortfin mako Isurus oxyrinchus is thought to be the fastest species of shark reaching speeds of up to 80 kph. It can reach up to 400 cm in length and is a metallic blue colour with a white ventral surface. It is easily recognised by its streamlined and robust morphology and large dark eyes. It has a very strong caudal keel. The caudal fin itself is large and lunate. Mako sharks have five large conspicuous gill slits.Shortfin makos, otherwise known as bonito sharks, are powerful and active sharks, known for leaping out of the water when in pursuit of prey or when hooked. The shortfin mako has a rapid growth in comparison to other pelagic sharks, and grows almost twice as fast as the porbeagle (Lamna nasus). It is also more slender than the porbeagle and lacks a second caudal keel (Compagno, 1984).
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