Fish nocturnal

Giant Electric Ray

Narcine entemedor

A master of disguise with a hidden spark, the Giant Electric Ray rules the sandy shallows of the Eastern Pacific. This gentle 'intimidator' uses its unique biological batteries to navigate and hunt in the dark of night.

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Quick Identification

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Size

Typically reaches 60-76 cm (24-30 inches) in length; weight ranges from 2.5-6 kg (5.5-13 lbs).

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Colors

Dorsal surface is sandy tan to chocolate brown with darker irregular blotches; ventral (underside) is uniform creamy white or pale yellow.

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Key Features

Circular pectoral disc wider than it is long
Two dorsal fins of nearly equal size located on the tail
Large, visible electric organs on either side of the head
Small eyes with prominent spiracles (breathing holes) immediately behind them

When You’ll See Them

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Activity pattern nocturnal

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Peak hours 10 PM - 4 AM

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Season Year-round, with increased sightings in spring during breeding migrations.

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Diet A specialist of the seafloor, it primarily hunts polychaete worms, small crustaceans, and tiny squids, often using its disc to trap prey against the sand before stunning them.

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Habitat Shallow tropical and subtropical coastal waters, specifically sandy or muddy bottoms near coral reefs and mangroves.

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Behavior

The Giant Electric Ray is a patient, nocturnal predator that spends the daylight hours partially buried in the sand. By using its pectoral fins to scoop substrate over its back, it becomes nearly invisible to both predators and prey, leaving only its eyes and spiracles exposed. While it may look sluggish, it is capable of short bursts of speed when disturbed or when pouncing on a meal.

Interaction with humans is generally peaceful, though the ray earned its name 'entemedor' (the intimidator) for its ability to deliver a mild electric shock if stepped on or handled. These shocks are generated by specialized muscle tissues called electrocytes. Unlike the more powerful Torpedo rays, the Giant Electric Ray's discharge is usually just enough to startle a human, though it is highly effective at incapacitating the small invertebrates it hunts.

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Camera Tips

Capturing the Giant Electric Ray requires a specialized approach since they are entirely aquatic and bottom-dwelling. For those with coastal properties or access to shallow docks, the best setup involves a waterproof action camera or a dedicated underwater trail camera mounted to a weighted 'sand-plate.' Place the camera at a slight downward angle, approximately 6 to 12 inches off the seabed. Look for 'sand-flats' adjacent to rocky outcrops, as these are the ray's preferred hunting grounds.

Because these rays are nocturnal and sensitive to bright, white light, we highly recommend using cameras with high-intensity infrared (IR) or 'no-glow' LEDs. If your camera allows, a red-light filter is even better, as it is less likely to spook the ray or attract swarms of baitfish that might obscure the lens. To draw a Giant Electric Ray into your camera's field of view, use a perforated bait canister (like a PVC pipe with holes) filled with crushed shrimp or squid. Secure the bait directly in front of the lens; the ray’s keen electroreceptors and sense of smell will lead it straight to the source.

Pay close attention to the tide cycles when setting your gear. The best footage is often captured during an incoming tide when fresh, nutrient-rich water moves over the flats, bringing the rays out of their sandy burrows to feed. Ensure your camera housing is rated for at least 10 meters of depth to handle pressure changes, and always use a tether line connected to a buoy or dock so you don't lose your equipment to shifting currents or burying sand.

Similar Species

Species that look similar or are commonly confused with Giant Electric Ray.

Lesser Electric Ray

Much smaller in size and typically found in the Atlantic/Caribbean rather than the Pacific.

Bullseye Electric Ray

Features a distinct, large 'eyespot' or ocellus in the center of its back for scaring predators.

Round Stingray

Has a long, whip-like tail with a sharp stinging spine and lacks the two prominent dorsal fins of the Electric Ray.

Frequently Asked Questions

The Giant Electric Ray is strictly nocturnal. It spends the day buried in the sand to avoid predators and emerges after sunset, with peak foraging activity occurring between 10 PM and 4 AM.

You can attract them by placing a scent-dispersing bait bag containing oily fish or crushed crustaceans in front of an underwater camera. They are highly sensitive to chemical cues in the water.

Their diet consists mainly of soft-bodied invertebrates like polychaete worms, as well as small crabs and shrimp found buried in the seafloor.

They are common in coastal suburban areas with sandy beachfronts or estuaries from the Gulf of California down to Panama, often found in water just a few feet deep.

Look for the two large dorsal fins on the tail and the rounded, shovel-like shape of the front disc. Unlike stingrays, they lack a venomous tail barb and instead possess visible kidney-shaped electric organs behind the eyes.

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