Fish diurnal

Porcupine Ray

Urogymnus asperrimus

The Porcupine Ray is the ocean’s armored tank, trading the traditional stingray barb for a spectacular coat of needle-sharp thorns. A rare find for any diver or coastal observer, this circular wonder is a master of the sandy shallows.

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Quick Identification

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Size

Disc width of 1.2–1.5 m (3.9–4.9 ft); total length can reach over 2 m (6.6 ft)

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Colors

Uniform light to dark gray, brown, or purplish-brown on the upper disc; covered in distinctive white or pale sharp thorns and tubercles.

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Key Features

Nearly circular pectoral fin disc
Densely covered in sharp, conical thorns
Lacks a venomous stinging spine on the tail
Thin, whip-like tail without any fin folds

When You’ll See Them

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Activity pattern diurnal

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Peak hours 9 AM - 4 PM

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Season Year-round

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Diet A carnivorous bottom-feeder that targets crustaceans, mollusks, and small bony fish. They use a suction-and-crush method to eat hard-shelled prey.

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Habitat Shallow tropical coastal waters, including sandy lagoons, coral rubble patches, and lush seagrass beds.

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Behavior

The Porcupine Ray is a unique outlier among stingrays. While most of its relatives rely on a venomous barb for protection, this species has evolved a literal suit of armor. It is a slow-moving, bottom-dwelling specialist that spends much of its time cruising sandy flats or resting partially buried in the substrate. Despite its intimidating appearance, it is generally unaggressive, though its skin is so abrasive it can cause significant injury to anything—or anyone—that tries to handle it.

These rays are typically solitary and are known for their 'excavation' feeding style. They use their powerful pectoral fins to stir up the seabed, uncovering hidden prey. Because they lack a sting, they are often more approachable than other rays, but they rely on their incredibly tough, thorn-covered hide to deter large predators like hammerhead sharks. In areas with human activity, they may become accustomed to piers or docks where fish scraps are available, though they remain relatively rare and elusive across their range.

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Camera Tips

Capturing a Porcupine Ray on camera requires a specialized underwater setup, particularly one capable of handling the high-glare environment of shallow sandy flats. If you are setting up a camera near a dock, pier, or reef edge, positioning is everything. Place your camera housing at a slight upward angle if it's on the seabed, or use a weighted tripod to keep it steady against the ebb and flow of the tide. Because these rays blend in perfectly with sandy bottoms, look for 'halos' or depressions in the sand—signs of recent feeding—and set your gear nearby.

Lighting is your best friend when trying to highlight the Porcupine Ray’s unique texture. In shallow water (less than 5 meters), natural sunlight provides the best results, but try to film during the mid-morning or early afternoon when the sun is directly overhead to minimize surface reflection. The sharp thorns that give this ray its name are its most photogenic feature; side-lighting from an underwater strobe or video light can create shadows that make the 'porcupine' texture pop against the flat disc of the body.

While we don't recommend traditional 'baiting' which can disrupt natural behaviors, placing your camera near areas with high natural invertebrate activity, such as seagrass boundaries, increases your chances. These rays are slow travelers. Set your camera to a high frame rate (60fps or higher) if you want to capture the mesmerizing, undulating movement of their circular fins in slow motion. If using a motion-activated underwater housing, ensure the sensitivity is set high, as the ray’s slow, gliding motion may not always trigger less sensitive sensors.

Lastly, be patient with the tides. Porcupine Rays often move into shallower lagoons during high tide to feed and retreat as the water levels drop. Time your camera checks and battery swaps during low tide to make the process easier and safer for both you and the marine environment. Check your lens for 'marine snow' or sand kick-up, as the ray’s feeding habit involves blowing sand around, which can quickly obscure your shot if the camera is too close to the 'blast zone' of its mouth.

Similar Species

Species that look similar or are commonly confused with Porcupine Ray.

Mangrove Whipray

The Mangrove Whipray has a much longer, whip-like tail and lacks the dense, sharp thorns found across the Porcupine Ray's disc.

Broad-Stingray

The Broad-Stingray has a more angular, diamond-shaped disc and possesses a dangerous venomous barb on its tail.

Frequently Asked Questions

Porcupine Rays are primarily diurnal, meaning they are most active during daylight hours. They are often spotted during mid-day when the sun illuminates the shallow sandy flats where they forage for food.

You can't easily attract them like birds, but you can increase your chances by placing underwater cameras near seagrass beds or reef edges where crustaceans are plentiful. They are attracted to areas with soft sediment that they can easily sift through for prey.

Their diet consists mainly of benthic invertebrates. This includes crabs, shrimp, worms, and small clams which they crush using their powerful dental plates after sucking them out of the sand.

They are not common in the traditional sense, but they are found in coastal regions near human settlements in the Indo-Pacific. You might find them around quiet jetties or beach fronts, though they prefer areas with minimal high-speed boat traffic.

The most obvious giveaway is the absence of a venomous tail spine and the presence of sharp, white thorns all over the back. Most other rays have smooth skin or only a few thorns along the midline of the back.

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