Fish Active day and night

Agujon Needlefish

Tylosurus acus

iNaturalist Wikipedia

A sleek, silver arrow of the sea, the Agujon Needlefish is a master of surface stealth. With its needle-like jaws and shimmering scales, this global predator is a fascinating frequent visitor to coastal docks and reefs alike.

0 Sightings

0 Habitats

Quick Identification

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Size

Typically 60–90 cm (24–35 in), reaching a maximum length of 150 cm (5 ft) and weighing up to 4 kg (8.8 lbs).

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Colors

Iridescent dark blue or greenish-blue on the dorsal side, transitioning to brilliant silver or white along the flanks and belly.

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Key Features

Extremely elongated, beak-like jaws filled with needle-sharp teeth
Slender, cylindrical body with fins set far back
Distinctive dark blue lateral stripe often visible on juveniles
Large eyes optimized for surface hunting

When You’ll See Them

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Activity pattern Active day and night

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Peak hours Dawn, dusk, and night (when attracted to light)

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Season Year-round in tropical climates; Summer months in temperate zones

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Diet A specialized carnivore that feeds primarily on small schooling fish like silversides, anchovies, and pilchards. They use a lightning-fast sideways strike to impale prey with their sharp teeth.

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Habitat Coastal waters, coral reefs, lagoons, and mangrove-lined canals; occasionally found in open offshore waters near the surface.

public Geographic range

Where Does the Agujon Needlefish Live?

The Agujon Needlefish is a truly global species, inhabiting tropical and warm-temperate waters across the Atlantic, Indian, and Pacific Oceans. In the Western Atlantic, they are frequently spotted from the shores of Massachusetts down to Brazil, including the entire Gulf of Mexico and the Caribbean Sea. They are also common residents of the Indo-Pacific, ranging from the Red Sea and East Africa to the islands of Polynesia and northern Japan.

Basemap © OpenStreetMap contributors

8 Countries

150M km² Range

Least Concern Conservation

US United States MX Mexico BR Brazil AU Australia JP Japan

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iNaturalist / Verified observation data

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Behavior

The Agujon Needlefish is a formidable surface predator known for its incredible speed and agility. Often found patrolling the top few inches of the water column, these fish use their slender profiles to remain nearly invisible to prey from below. They are social creatures, frequently seen in small schools or pairs, though larger individuals may hunt solo. One of their most striking behaviors is their ability to leap out of the water and 'skitter' across the surface at high speeds, a tactic used to escape predators like tuna or dolphins.

While generally wary of humans, they are often attracted to artificial lights at night, which can make them a common sight around docks and piers. They are highly reactive to movement and light reflections. Despite their sharp teeth, they are not aggressive toward humans, though their tendency to jump toward light sources at night can make them a minor hazard for boaters in certain regions.

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Camera Tips

Capturing the Agujon Needlefish requires a specialized approach because they live exactly at the air-water interface. If you have a backyard dock or a seawall, the most effective setup is a pole-mounted underwater camera submerged just 6–12 inches below the surface. Aim the lens horizontally or slightly upward to catch the silvery flash of their flanks against the sunlight. Because these fish are highly reflective, avoid using high-intensity underwater strobes during the day, as they will wash out the metallic details of the scales.

For night photography, these fish are famously attracted to light. Using a green or white submerged LED dock light will almost certainly draw them into your camera’s field of view. Position your camera on the edge of the light's glow rather than directly in the center; this allows the AI to capture the fish as they cruise through the 'strike zone' to hunt smaller fish attracted to the beam. A high frame rate (60fps or higher) is recommended to freeze their rapid, darting movements.

If you are using an above-water camera, such as a high-mounted trail cam overlooking a canal, a circular polarizing filter is essential. This filter will cut through the surface glare and reflections, allowing the camera to see the elongated shapes of the Needlefish just beneath the surface. Look for 'skittering' activity—if you see splashes that look like a stone skipping across the water, it’s a sign that Agujon are active in the area and your camera is well-placed.

Similar Species

Species that look similar or are commonly confused with Agujon Needlefish.

Houndfish

Much larger and heavier-bodied with a distinct keel on the tail base.

Atlantic Silverstripe Halfbeak

Significantly smaller; only the lower jaw is elongated, whereas both jaws are long on the Agujon.

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Frequently Asked Questions

Agujon Needlefish are active throughout the day but exhibit peak hunting behavior during dawn and dusk. They are also highly active at night in areas with artificial lighting, which attracts the smaller fish they prey upon.

The most effective way to attract them is by installing a submersible dock light. These lights attract baitfish, which in turn draw in Needlefish. Keeping the water clean and maintaining natural mangrove edges also provides a better habitat for their prey.

They are strictly carnivorous, specializing in small, silvery schooling fish. They use their long, tooth-filled beaks to snatch prey with a quick sideways snap of the head.

Yes, they are very common in suburban canals, marinas, and coastal waterways. They are often seen hovering near the surface around docks and bridge pilings.

While similar, the Agujon is typically more slender. The best way to distinguish them is by looking at the tail base; the Houndfish (Tylosurus crocodilus) has a prominent lateral keel (a fleshy ridge) on the tail base, which the Agujon lacks.

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