Fish Active during the day

Tailspot Blenny

Ecsenius stigmatura

iNaturalist Wikipedia

With its neon 'eyeliner' and curious personality, the Tailspot Blenny is the tiny, coppery star of the Western Pacific reefs.

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Quick Identification

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Size

Grows to a maximum length of 6 cm (2.4 inches); weight is negligible, typically under 15 grams.

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Colors

Copper to orange-brown body with a distinctive blackish spot at the base of the tail. Features vibrant neon blue or hot pink horizontal stripes directly beneath the eyes.

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Key Features

Distinct black spot at the base of the tail
Neon blue or pink 'eyeliner' markings
Blunt, rounded head with large, expressive eyes
Continuous dorsal fin and comb-like teeth

When You’ll See Them

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Activity pattern Active during the day

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Peak hours 8 AM - 5 PM

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Season Year-round

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Diet Primarily an herbivore (specifically a limnivore) that grazes on filamentous algae and organic detritus found on rocks and coral.

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Habitat Coastal coral reefs, sheltered lagoons, and rocky rubble zones at depths of 1 to 15 meters.

public Geographic range

Where Does the Tailspot Blenny Live?

The Tailspot Blenny is native to the tropical waters of the Western Pacific Ocean. Its primary range is centered within the Coral Triangle, spanning from the Philippines and Indonesia to the Solomon Islands and Palau. While it is most concentrated in these biodiversity hotspots, it can also be found in coastal reef systems as far north as Taiwan and as far south as the northern edges of the Great Barrier Reef.

Basemap © OpenStreetMap contributors

6 Countries

1.2M km² Range

Least Concern Conservation

PH Philippines

Marginal

ID Indonesia

Marginal

Solomon Islands

Marginal

Taiwan

Marginal

Palau

Marginal

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iNaturalist / Verified observation data

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Behavior

The Tailspot Blenny is a charming and highly active reef fish known for its distinct personality. Unlike many fish that swim constantly in the water column, this species spends most of its time 'perching' on rocky outcroppings or coral heads using its pelvic fins. They are extremely territorial over their favorite hiding spots—typically small holes or crevices—and will often reverse into these spots tail-first so they can watch the world with only their heads protruding.

Socially, they are generally peaceful toward other reef inhabitants but can become feisty with members of their own species or other blennies that compete for the same food or territory. When they feel threatened or are engaging in courtship, the iridescent lines under their eyes can intensify in brightness, flashing a vivid pink to warn off intruders or attract a mate. They are diurnal creatures, retreating into the safety of the reef at night.

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Camera Tips

Capturing high-quality footage of a Tailspot Blenny requires a specialized approach, as these are small, fast-moving marine animals. If you are using an underwater camera on a reef or in a 'backyard' reef aquarium, placement is everything. Look for a 'perch stone'—a flat-topped rock or coral head where the blenny frequently sits to scan its surroundings. Position your camera at eye level with this spot, ideally using a macro lens to capture the incredible detail of its iridescent eye markings.

For the best results, use a tripod or a weighted mount to keep the camera steady, as the jerky movements of the blenny can be difficult to track manually. Since they are herbivores, you can encourage them to stay in frame by positioning the camera near a patch of green filamentous algae. In aquarium settings, a high-definition 'clip-on' macro lens for a smartphone can yield professional results if you wait for the fish to approach the glass.

Lighting is the biggest challenge when photographing the Tailspot Blenny. To see the coppery body and the neon 'eyeliner,' you need bright, full-spectrum light. If you are diving, use a video light or strobe set at a 45-degree angle to avoid 'backscatter' (illuminating particles in the water). If you are filming in a tank, ensure your reef lights are at their peak intensity. Use a high frame rate (at least 60fps) because these fish dart between spots with lightning speed; higher frame rates allow you to slow down the footage to see their unique swimming mechanics.

Similar Species

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

Bicolor Blenny

Features a striking split color pattern (blue-grey front, orange back) and lacks the specific tail spot and neon eye lines.

Midas Blenny

Grows larger, has a bright golden-yellow body, and spends more time swimming in open water rather than perching on rocks.

Linear Blenny

Lacks the tail spot and instead features dark horizontal lines running along its body.

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Frequently Asked Questions

Tailspot Blennies are strictly diurnal, meaning they are active during the daylight hours. They spend their days grazing on algae and defending their territory, and they retreat into small holes in the rockwork to sleep as soon as the sun goes down.

Unless your 'backyard' is a tropical coral reef in the Western Pacific, you won't find them in a traditional yard. However, they are popular in the 'backyard reef' hobby (saltwater aquariums). To attract their attention in a tank, provide plenty of live rock with natural algae growth and small crevices for them to hide in.

Tailspot Blennies are primarily herbivores. Their diet consists mostly of filamentous algae and detritus which they scrape off rocks using their specialized comb-like teeth. In an aquarium setting, they also enjoy algae wafers and mysis shrimp.

No, they are marine fish and are only found in ocean reef environments or in home saltwater aquariums. They do not inhabit freshwater lakes, ponds, or terrestrial suburban areas.

While both belong to the Ecsenius genus, the Bicolor Blenny is half-orange and half-blue/grey. The Tailspot Blenny is a uniform coppery-brown with a distinct dark spot at the base of its tail and bright pink or blue lines under its eyes.

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