Istiompax indica

The black marlin (Istiompax indica) is a species of marlin found in tropical and subtropical areas of the Indian and Pacific Oceans approximately between 40 degrees North and 45 degrees South, while in some instances venturing into more temperate waters. Reaching lengths of over 4.5 m (15 ft), it is one of the largest marlins and also one of the largest bony fish. Marlin are among the fastest fish, but speeds may be exaggerated in popular media, such as reports of 129 km/h (80 mph). A 2016 study estimated maximum swimming speeds from muscle contraction times, which in turn limit the tail-beat frequency; the study suggested a theoretical upper limit for the black marlin's burst speed of 36 km/h (22 mph).

Black marlin are fished commercially and are also a highly prized game fish. Black marlins were known to drag ancient Maldivian fishing boats for very long distances after being hooked, until the marlins finally tired; it would take many hours for the fishermen to row or sail back home. Due to the common misidentification of large billfish such as the black marlin, as well as its highly migratory habits and the lack of research into the species, much about populations are unknown. The species was first known as Tetrapturus indicus and later was reclassified as Makaira indica before taking on its current scientific name. One of the earliest scientific records of black marlin is its description by French zoologist Georges Cuvier in 1832.