Crocodile Needlefish

The Crocodile Needlefish, also known as the Houndfish (Tylosurus crocodilus), is one of the largest species in the needlefish family Belonidae. It is a circumtropical species found in warm coastal, oceanic, and reef-associated waters around the world, including the Atlantic, Indian, and Pacific Oceans. Its common name references its long, powerful jaws and prominent teeth, reminiscent of a crocodile's snout. Adults can exceed a meter in length, making it far larger than most other needlefish. It is an important surface predator in tropical marine food webs, feeding on smaller fish. The species is capable of leaping from the water at speed, a trait shared with other members of its family.

• Very large needlefish, commonly 100-150 cm long, with a stout, elongated, cylindrical body
• Long, heavy jaws lined with numerous sharp teeth, proportionally larger and more robust than in smaller needlefish species
• Blue-green iridescent dorsal coloration transitioning sharply to silvery-white on the sides and belly
• Dorsal and anal fins are set far back on the body and roughly mirror each other in shape and position
• Slightly forked caudal fin
• Distinguished from smaller needlefish by its greater bulk and heavier jaw structure; distinguished from garfish and halfbeaks by having jaws of roughly equal length rather than one greatly elongated jaw

Crocodile Needlefish inhabit warm coastal and oceanic surface waters throughout the tropics and subtropics, ranging across the Atlantic, Indian, and Pacific Oceans. They are found around coral reefs, lagoons, harbors, and open coastal waters, generally remaining in the upper few meters of the water column. The species tolerates a wide range of nearshore conditions, from clear reef flats to turbid harbor waters, and can occasionally be encountered well offshore over deep water. It favors sea surface temperatures typical of tropical and warm-temperate zones and is broadly distributed rather than confined to a single ocean basin, making it one of the most widespread large needlefish species globally.

Crocodile Needlefish are solitary to loosely social surface predators that hunt smaller fish using bursts of speed and a sideways snapping strike of their long jaws. They are frequently seen holding near the surface, sometimes around lights at night where baitfish congregate, and are known for spectacular leaps and skittering runs across the water when startled or chasing prey. This leaping behavior, along with its speed, makes it notable among Beloniformes. It plays a role as a mid-level predator in reef and coastal food webs, itself preyed upon by larger pelagic fish and seabirds. Spawning occurs in open water, with eggs bearing sticky filaments that attach to floating debris or vegetation.