Agujon Needlefish

The Agujon Needlefish (Tylosurus acus) is one of the largest species in the needlefish family Belonidae, closely related to the Houndfish and sharing its elongated, toothy jaws and torpedo-shaped body. It is found in warm coastal and offshore surface waters worldwide, across the Atlantic, Indian, and Pacific Oceans. As a top predator among small surface fish, it plays a significant role in nearshore and open-water food webs. Agujon Needlefish are known for powerful leaps when startled or feeding, a trait shared with other large needlefish. The species is widespread and not considered threatened.

Identifying the Agujon Needlefish:

• Very long, slender body, among the largest needlefish, reaching up to about 1.8 meters
• Elongated, slender beak-like jaws of nearly equal length, lined with sharp teeth
• Dark blue-green back contrasting with bright silvery sides and belly
• Small dorsal and anal fins set far back near the tail
• Deeply forked caudal fin

Its great length and slender build distinguish it from the bulkier Houndfish, while its larger maximum size separates it from smaller Strongylura needlefish. Precise identification within the Tylosurus genus often relies on subtle differences in jaw and fin proportions.

Agujon Needlefish inhabit surface waters of warm coastal seas, reef edges, and open ocean, found in tropical and subtropical regions across the Atlantic, Indian, and Pacific Oceans. They are typically encountered cruising just below the surface, ranging from shallow nearshore waters to considerably deeper offshore areas, generally in sea temperatures above about 20°C. Their broad distribution across multiple ocean basins reflects a tolerance for both coastal and open-water conditions, making them one of the more widely ranging large needlefish species.

Agujon Needlefish are fast, active predators that hunt small schooling fish near the surface, using bursts of speed and their long toothy jaws to seize prey. Like other large needlefish, they are prone to spectacular leaps when startled, particularly by boat lights or engine noise at night, sometimes covering considerable distances through the air. They are typically solitary or loosely associated rather than forming dense schools. Spawning occurs in warm coastal and open waters, with eggs bearing adhesive filaments that attach to floating debris or vegetation, after which young needlefish grow rapidly toward their large adult size.