Life of Sea | Indo-Pacific Sailfish (Istiophorus platypterus) | Originally, Indo-Pacific sailfish is widely distributed in the tropical and temperate waters of the Pacific and Indian oceans. You can find near continental coasts, islands and reefs. Indo-Pacific sailfish is one of the species from genus Istiophorus. It is also known as Bayonet fish. 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.
Genus: Istiophorus, Lacépède, 1801
Species: I. platypterus
Indo-Pacific sailfish is an oceanic species that feeds on schooling fishes such as sardines, anchovies and mackerels.These fish can swim up to 70 miles per hour. They are hands down the fastest animal in the ocean. Their sail is typically not extended and held to the side. They use the sail while hunting to herd fish, and some scientists think they also use the sail to regulate their body temperature.
Reproductive behaviorof the Indo-Pacific sailfishareconcerns themaleand femaleswimin pairs, or severalmalesbehindasinglewoman, just beforethe spawningplace. The femaleproduceshuge numbers ofeggs, which hatchintotinylarvae, and the developmentof the sail-like dorsal finandelongatedbill whenonly fiveinches long.
The Indo-Pacific sailfishspawnthroughout the yearin tropicalandsubtropical waters, with peakspawningtakes place duringthe summer.Populations inthe Pacificto undergoseasonalmigrationsspawn, verylargedistances.The Indo-Pacificsailfishare fishedbyboth commercialfishingand sportfishing, andalso seenas by catchbycommercialtuna. Whilethis specieshasahighreproductiveoutput, the populationislikely influenced byover exploitation.