Indo-Pacific sailfish

Indo-Pacific sailfish
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Perciformes
Family:	Istiophoridae
Genus:	Istiophorus Lacépède, 1801
Species:	I. platypterus
Binomial name
Istiophorus platypterus (Shaw, 1792)

Exhibiting sail-raising behavior

 
The Indo-Pacific sailfish, Istiophorus platypterus, is a sailfish native to the Indian and Pacific Oceans. It is dark blue on top, brown-blue laterally, silvery white underbelly; upper jaw elongated in form of spear; first dorsal fin greatly enlarged in the form of a sail, with many black cones, its front squared off, highest at its midpoint; pelvic fins very narrow, reaching almost to the anus; body covered with embedded scales, blunt at end; lateral line curved above pectoral fin, then straight to base of tail. They have a large and sharp bill, that they use for hunting. They feed on tuna and mackerel, some of the fastest fish in the Ocean. They are able to prey on the faster fish in the sea because their top speed has been clocked at 109 km/h (68 mph), making them one of the fastest fish in the ocean. The Indo-pacific sailfish is related to the Marlin.
It is theorized by marine biologists that the 'sail' (dorsal fin array) of the sailfish may serve the purpose of a cooling and heating system for this fish; this due to a network of a large number blood vessels found in the sail and because of "sail-raising" behaviour exhibited by the sailfish at of near the surface waters after or before high-speed bursts.

Fisheries

Capture of Indo-Pacific sailfish in tonnes from 1950 to 2009