Houndfish

Fascinating facts about the Houndfish

• In 1821 François Péron and Charles Lesueur first named this fish Belona crocodila, with the type locality given as Mauritius. Two subspecies, Tylosurus crocodilus crocodilus and T. c. fodiator, were later recognised.
• Juvenile houndfish are the only needlefish whose teeth point forward, a quirky adaptation that disappears as they grow. This forward-facing bite hints at a hunting style unlike its relatives, reminding us that small changes can reshape an entire feeding strategy.
• At up to 5 feet (1.5 m) long and 10 lb (4.5 kg) heavy, the houndfish is the heavyweight champion of needlefishes. Its size lets it dominate pelagic lagoons and reefs, proving that being the biggest in a family can open whole new habitats.
• The longest recorded individual measured 150 cm (4.9 ft) and weighed 6.35 kg (14 lb), slightly surpassing the typical maximum. Those record-breaking dimensions illustrate how occasional giants push the limits of what a species can achieve.
• In April 2000 a snorkeler in the Florida Keys was stabbed in the neck when a houndfish leapt out of the water, and in October 2010 a kayaker suffered a collapsed lung from a similar strike. These painful encounters show that even sleek, silver fish can be as dangerous as a swordfish when startled.

At a glance

About the Houndfish

The crocodile needlefish, Tylosurus crocodilus, commands attention with its sleek, cylindrical body that can reach up to 1.5 m (5 ft) and a weight of 4.5 kg (10 lb). Its dark-blue back fades to silver-white sides and a plain white belly, while a distinct keel on the caudal peduncle supports a deeply forked tail. Juveniles are marked by an elevated black lobe on the posterior dorsal fin and, uniquely among its genus, their teeth point forward, a trait that disappears as they mature. With 21–25 soft dorsal rays, 19–22 anal rays, and 80–86 vertebrae, the houndfish is built for swift, pelagic life over lagoons and seaward reefs, where it hunts in small groups, snapping up smaller fish with its needle-like beak. Beyond its predatory prowess, the houndfish displays a surprising reproductive quirk: each egg bears tendrils that cling to floating objects, anchoring the next generation in the open ocean. Found from the Red Sea across the Indian and Pacific Oceans to New Jersey in the western Atlantic, it even entered the eastern Mediterranean via the Suez Canal, a classic Lessepsian migration. Anglers prize it as a game fish, yet its green-tinged flesh limits market demand, and its propensity to leap from the water, sometimes delivering puncture wounds, adds a dangerous edge to encounters, echoing the fearsome reputation of swordfish.

More fish to discover

Browse Feravox