Fish Active at night

Snake Blenny

Xiphasia setifer

iNaturalist Wikipedia

Meet the ocean's ribbon-dancer. The Snake Blenny is an extraordinary, eel-like fish that spends its days peeking from the sand and its nights gliding through the Indo-Pacific currents.

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Quick Identification

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Size

Reaches up to 53 cm (21 inches) in length; it is the longest species of combtooth blenny, characterized by an extremely slender, ribbon-like body.

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Colors

Base color is typically yellowish-tan or light brown with 20 to 30 dark vertical bars along the flanks; features a distinct black spot on the anterior portion of the dorsal fin.

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Key Features

Extremely elongated, eel-like body shape
Dorsal fin originates forward on the head, near the eyes
Prominent, curved canine teeth in the lower jaw
Tapered tail ending in a fine point

When You’ll See Them

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Activity pattern Active at night

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Peak hours 9 PM - 3 AM

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Season Year-round

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Diet Carnivorous; it primarily hunts for small benthic invertebrates, tiny crustaceans, and zooplankton that drift near the seabed.

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Habitat Coastal marine environments with sandy or muddy bottoms, often near the base of coral reefs or in sheltered bays.

public Geographic range

Where Does the Snake Blenny Live?

The Snake Blenny is widely distributed across the tropical and subtropical waters of the Indo-Pacific. Its range begins in the Red Sea and extends along the East African coast, stretching across the Indian Ocean to the Western Pacific, reaching as far north as Japan and as far south as northern Australia and New Caledonia. This species thrives in the nutrient-rich coastal zones of Southeast Asia and the various island nations within the Coral Triangle.

Basemap © OpenStreetMap contributors

9 Countries

12M km² Range

Least Concern Conservation

JP Japan

Marginal

AU Australia

Marginal

ID Indonesia

Marginal

PH Philippines

Marginal

TH Thailand

Marginal

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iNaturalist / Verified observation data

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Behavior

The Snake Blenny is a master of the benthos, known for its unique burrowing lifestyle. Unlike many of its relatives that inhabit rocky crevices, this species prefers soft substrates where it can construct its own burrows or occupy abandoned ones. During the day, it is often seen with only its head poking out of the sand, scanning for predators or drifting food, retreating instantly if it feels threatened.

At night, the Snake Blenny becomes more active, sometimes emerging fully to swim with a graceful, undulating motion similar to a water snake or an eel. It is a largely solitary creature but can be found in relatively high concentrations where the sediment is ideal for burrowing. In the aquarium world, it is prized for its unusual appearance, though it requires specialized care and a deep sand bed to mimic its natural environment.

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Camera Tips

To capture high-quality footage of a Snake Blenny, you will need a dedicated underwater trail camera or a waterproof action camera with an external power source. Because these fish are burrowers, placement is everything. Position your camera on a weighted low-profile tripod about 10-15 inches away from a suspected burrow entrance—look for clean, circular holes in sandy or silty patches near the reef edge. Angle the lens slightly downward to ensure the AI can capture the fish's head and the distinctive spots on its dorsal fin as it emerges.

Since Snake Blennies are primarily nocturnal, your camera must have excellent infrared (IR) capabilities. Avoid using standard white-light strobes, as the sudden flash will likely scare the fish back into its hole for the remainder of the night. Using a dim red light as a focus assist can help your camera lock focus without disturbing the blenny's natural behavior. Ensure the camera is set to record at a high frame rate (at least 60fps) to catch the fluid, snake-like movement of their body as they exit the burrow.

Baiting can significantly increase your chances of a close-up encounter. Secure a small mesh bag containing crushed mollusks or oily fish scraps near the burrow entrance. This scent trail will often entice the blenny to fully emerge from its hole to investigate. Be mindful of the tide; if you are in a shallow coastal area, ensure your camera is deep enough to remain submerged during low tide to avoid water surface reflections or overheating. Check your camera housing seals frequently, as the silty environments favored by this species can be abrasive to O-rings.

Similar Species

Species that look similar or are commonly confused with Snake Blenny.

Largehead Hairtail

Much larger and more silver in color; lacks the distinct vertical bars and is found in deeper, open water rather than burrows.

Convict Blenny

Has a similar elongated body but usually features horizontal stripes rather than vertical bars and has a more rounded tail.

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Frequently Asked Questions

Snake Blennies are primarily nocturnal, meaning they are most active during the night. While they might peek their heads out of their burrows during the day, they typically only emerge fully to feed or move around under the cover of darkness.

The best way to attract a Snake Blenny is by using scent. A small mesh bait bag filled with chopped shrimp or fish bits placed near their burrow entrance will often entice them to come out of hiding. Using red-filtered lights rather than white lights also helps keep them from retreating.

They are carnivores that specialize in eating small marine life. Their diet consists mostly of tiny benthic crustaceans, zooplankton, and other small invertebrates that live on or just above the sandy seabed.

They are quite common in tropical coastal areas with sandy or muddy bottoms, which can include the waters off suburban beaches or docks in places like Queensland, Australia, or Southeast Asia, though they are rarely seen by casual swimmers because of their burrowing nature.

While they look like eels, you can tell a Snake Blenny apart by its head and fins. Unlike most eels, Snake Blennies have large eyes and a dorsal fin that starts right on top of their head. They also have the characteristic 'comb' teeth and large lower canines typical of blennies.

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