The shortfin mako shark, Isurus oxyrinchus ("sharp nose"), is a large mackarel shark. Along with the closely related longfin mako (Isurus paucus) it is commonly referred to as "mako shark."
Anatomy and appearance
Although both sexes grow at about the same rate, females are thought to have a longer lifespan, and generally grow larger and more rotund. This species grows to an average length of 1.82–3.2 metres (5 ft 12 in–10 ft 6 in) and to a weight of approximately 60–400 kilograms (130–880 lb). The largest reported male specimen weighed 454 kilograms (1,001 lb) and measured 4.02 meters (13 ft), although a near record-sized female shortfin mako measuring 3.96 meters (13 ft) weighted 794 kilograms (1,750 lb). The shortfin is sleek and spindle-shaped with a long conical snout. Mako sharks have a more hydrodynamic shape than any shark other than the salmon shark. Combined with the lamnidae's typical high aerobic muscle mass, this enables its spectacular speed and agility.
It has a crescent shaped caudal (tail) fin. The caudal base has a distinct caudal keel. Its second dorsal fin is much smaller than the first. The apexes of pectoral fin and first dorsal fin are rounded in younger makos. Makos carry very abrasive placoid scales that cover the skin to reduce friction during swimming.