Fish Active at night

Spotfin Squirrelfish

Neoniphon sammara

iNaturalist Wikipedia

A shimmering sentinel of the Indo-Pacific reefs, the Spotfin Squirrelfish is a master of the night, easily identified by its slender silver frame and a bold black mark on its dorsal fin.

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Quick Identification

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Size

Commonly 23 cm (9 in), reaching a maximum length of 32 cm (12.6 in)

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Colors

Silvery-white body with horizontal reddish-brown stripes; features a prominent black spot on the first few spines of the dorsal fin

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Key Features

Slender, elongated body profile
Large black spot on the anterior dorsal fin
Sharp, venomous spine on the preopercle (cheek)
Large, dark eyes adapted for night vision

When You’ll See Them

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Activity pattern Active at night

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Peak hours 7 PM - 5 AM

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Season Year-round

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Diet A nocturnal carnivore that specializes in benthic invertebrates, primarily consuming shrimp and small crabs, along with occasional small fish.

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Habitat Clear coral reefs, shallow lagoons, and seagrass beds, typically found at depths between 1 and 40 metres.

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Where Does the Spotfin Squirrelfish Live?

The Spotfin Squirrelfish is a widespread inhabitant of the Indo-Pacific region, flourishing in the warm tropical waters that stretch from the Red Sea and the eastern coast of Africa all the way to the Hawaiian and Line Islands. Within this vast area, they are commonly sighted throughout the Coral Triangle, including Indonesia and the Philippines, and extend as far south as the northern coast of Australia and north to the Ryukyu Islands of Japan. They are a staple species of the Great Barrier Reef and are frequently encountered in the diverse marine ecosystems of the Maldives and Seychelles.

Basemap © OpenStreetMap contributors

10 Countries

85M km² Range

Least Concern Conservation

ID Indonesia PH Philippines AU Australia US United States JP Japan Maldives Seychelles TH Thailand Vietnam Egypt

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iNaturalist / Verified observation data

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Behavior

The Spotfin Squirrelfish is a primarily nocturnal species that exhibits a fascinating duality in its daily routine. During daylight hours, these fish are social but cautious, often found hovering in small groups near the protection of coral overhangs, caves, or thickets of staghorn coral. Unlike many other squirrelfish that hide deep within the reef, the Spotfin is relatively bold and can often be seen by snorkelers near the edge of its retreat.

As dusk approaches, their behavior shifts dramatically. They leave the safety of the reef structure to hunt individually over sandy flats and seagrass beds. They are energetic swimmers at night, using their large eyes to detect the movement of small crustaceans. While they are generally indifferent to humans, they are well-defended; a venomous spine on their cheek serves as a deterrent against predators and can cause a painful, though usually non-lethal, sting to an unwary person who tries to handle them.

photo_camera EverydayEarth exclusive

Camera Tips

To capture the Spotfin Squirrelfish on an underwater AI camera, location is everything. Position your camera near 'structure'—this could be a coral head, a rock ledge, or even a pier piling. During the day, they prefer the shaded side of these structures. Angle your camera slightly upward toward the surface; this helps the AI identify the fish's slender silhouette and the distinctive dorsal spot against the ambient light from above.

Since this species is most active after dark, your camera's infrared (IR) performance is critical. Squirrelfish have highly reflective silver scales that can 'white out' a photo if the IR flash is too close or too bright. Set your camera to a low-intensity flash mode if available, or place the camera 3-5 feet away from the target area to allow the light to diffuse. If you are using a triggered setup, look for signs of 'cleaning stations' nearby, as these fish often pause in these areas, providing a perfect still-shot opportunity.

Maintenance is a unique challenge for marine cameras. Ensure your lens housing is cleaned weekly to prevent algae or barnacle growth, which can confuse AI detection algorithms. In backyard reef setups, avoid placing the camera in high-surge areas where bubbles or floating debris might trigger the sensor. Instead, choose a sheltered 'lee' side of a reef patch where the water is clearer and the fish feel more secure swimming slowly in front of the lens.

Similar Species

Species that look similar or are commonly confused with Spotfin Squirrelfish.

Blackfin Squirrelfish

Has a much larger black area covering most of the dorsal fin and a thicker, less elongated body.

Crown Squirrelfish

Features much bolder red and white stripes and lacks the prominent black spot on the dorsal fin.

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Frequently Asked Questions

Spotfin Squirrelfish are nocturnal, meaning they are most active at night. While they can be seen hovering near coral during the day, they do most of their hunting for shrimp and crabs between dusk and dawn.

You can attract them by providing 'structure' like rock piles or artificial reef balls that offer shade and protection. They are naturally curious about new structures and will often claim a shaded crevice as their home base during the day.

Their diet consists almost entirely of small crustaceans like shrimp and crabs found on the seafloor, though they will occasionally eat very small fish if the opportunity arises.

Yes, in tropical regions like Hawaii, Florida, or Queensland, they are very common around boat docks, piers, and shallow suburban lagoons that have healthy coral or rock cover.

Look for the distinctive black spot on the front of the first dorsal fin and a more slender, elongated body shape. Most other squirrelfish are deeper-bodied and lack that specific 'ink-spot' marking.

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