Fish nocturnal

Round Fantail Stingray

Taeniurops grabatus

A circular giant of the sandy depths, the Round Fantail Stingray is one of the most striking rays found in coastal waters. Known for its mesmerizing marbled patterns and graceful 'fantail,' this elusive predator is a highlight for any underwater camera enthusiast.

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Quick Identification

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Size

Disc width up to 150 cm (5 ft); total length up to 250 cm (8.2 ft); weight up to 84 kg (185 lbs)

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Colors

Dorsal surface is typically olive-green, grey-brown, or dark brown with heavy black mottling or marbling; the underside is creamy white.

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Key Features

Perfectly circular disc shape
Deep lower fin fold extending to the tip of the tail
Dark grey or olive-brown with heavy black mottling
Thick, fleshy tail base without a dorsal fin

When You’ll See Them

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Activity pattern nocturnal

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Peak hours 9 PM - 4 AM

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Season Year-round

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Diet A carnivorous bottom-feeder that preys on crustaceans like crabs and shrimp, mollusks, and small benthic fish.

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Habitat Coastal marine waters, specifically sandy or muddy bottoms, seagrass beds, and the sandy patches near rocky reefs.

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Behavior

The Round Fantail Stingray is a master of patience and camouflage. During the daylight hours, it is most frequently observed 'settled' into the substrate. By using its pectoral fins to stir up the sand and then letting it settle over its back, the ray becomes nearly invisible to both predators and prey, with only its eyes and spiracles protruding. This sedentary lifestyle is an energy-saving tactic, allowing it to remain hidden until the cover of darkness.

When the sun sets, the Round Fantail Stingray transforms into an active and elegant predator. It uses a combination of electroreception—sensing the tiny electrical pulses produced by the muscles of hidden prey—and a keen sense of smell to hunt. While generally docile and non-aggressive toward humans, it is equipped with a potent venomous barb on its tail for defense, which it will use if it feels stepped on or trapped.

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Camera Tips

To capture the Round Fantail Stingray, your camera needs to be positioned on the seafloor, ideally in a sandy 'clearing' adjacent to a rocky reef or seagrass bed. These rays are benthic dwellers, meaning they spend almost all their time on the bottom. Aim your camera at a slight upward angle (about 10-15 degrees) from the sand to capture the ray's profile as it glides over the substrate. If you have a coastal property or dock, securing your camera to a weighted base is essential to prevent it from being moved by tides or curious marine life.

Since traditional PIR (Passive Infrared) motion sensors do not function underwater, you should set your AI-powered camera to a time-lapse mode or use a camera equipped with pixel-change detection. A frequency of one shot every 30 to 60 seconds is often sufficient to catch a resting ray, but for active swimmers, a faster interval or continuous video triggered by external sensors is better. If using video, ensure you have a high-capacity SD card, as the movement of seagrass or particulates can cause frequent triggers.

Lighting is the biggest challenge when filming the Round Fantail Stingray at night, which is when they are most active. Avoid mounting your lights directly next to the lens, as this causes 'backscatter'—the reflection of light off tiny particles in the water that looks like a snowstorm. Instead, use off-camera lighting or wide-angle video lights mounted on arms to illuminate the scene from the sides. This will highlight the beautiful marbled texture of the ray's skin without washing out the image.

Lastly, seasonal changes in water clarity will significantly affect your results. In many regions, the Round Fantail Stingray is more common in shallower waters during the warmer months when they come closer to shore to breed or follow prey. Keep your lens clean by applying a thin layer of specialized anti-fouling gel or simply wiping the housing port every few days to prevent algae buildup, which can confuse AI detection algorithms and ruin otherwise perfect footage.

Similar Species

Species that look similar or are commonly confused with Round Fantail Stingray.

Common Stingray

Has a more angular, diamond-shaped disc and lacks the heavy black mottling found on the Round Fantail Stingray.

Marbled Ray

Often confused due to similar patterns, but the Marbled Ray (Taeniura meyeni) is typically found in the Indo-Pacific and grows significantly larger.

Frequently Asked Questions

Round Fantail Stingray are primarily nocturnal. While they can be seen resting during the day, they do most of their hunting and traveling between dusk and dawn.

You cannot easily attract them with food without disrupting the local ecosystem, but you can increase your chances by placing cameras near natural 'highways' like sandy channels between reefs or in areas with high crustacean activity.

They are benthic predators that eat a variety of bottom-dwelling creatures, including crabs, shrimp, clams, and small fish that they pin against the sand using their wide disc.

They are strictly marine animals and are not found in inland suburban areas, though they are frequently spotted near coastal towns, boat docks, and popular snorkeling beaches.

Look for the almost perfectly circular shape of the disc and the 'fantail'—a deep skin fold on the underside of the tail that distinguishes them from the more diamond-shaped Common Stingray.

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