Fish Active during the day

African Moonfish

Selene dorsalis

iNaturalist

Witness the shimmering 'Phantom of the Atlantic.' With its paper-thin profile and metallic silver armor, the African Moonfish is one of the ocean's most striking examples of evolutionary camouflage.

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Quick Identification

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Size

Length up to 15 inches (38 cm), though typically 8-10 inches (20-25 cm); weight up to 3.3 lbs (1.5 kg)

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Colors

Brilliant metallic silver or leaden hue across the entire body; occasionally exhibits a faint yellowish tint on the fins; translucent pelvic and dorsal filaments in juveniles

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Key Features

Extremely compressed, wafer-thin body
Steep, nearly vertical forehead profile
Lower jaw juts out beyond the upper jaw
Deeply forked tail and long, sickle-shaped pectoral fins

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 A carnivorous hunter that preys on small schooling fish, swimming crustaceans (like shrimp), and small squid.

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Habitat Shallow coastal waters, sandy or muddy sea floors, and brackish estuaries.

Behavior

The African Moonfish is a master of optical illusion. Its incredibly thin, disc-like body is designed for 'crypsis by silvering,' a specialized form of camouflage. By reflecting ambient light from its metallic scales, the fish becomes nearly invisible to predators and prey when viewed from the side, effectively blending into the shimmering water column of the open ocean.

These fish are highly social and are almost always found in large, synchronized schools. They frequent the shallow waters of the continental shelf, often hovering just above the sea floor. While they appear delicate, they are powerful swimmers capable of sudden bursts of speed to ambush small prey or evade larger predators like sharks and rays.

In terms of human interaction, they are a significant species for coastal fisheries across West Africa. They are not known to be aggressive, but they are wary; a school will often bank in unison to flash their silver sides as a deterrent or to confuse a perceived threat, a behavior that looks like a sudden underwater explosion of light.

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Camera Tips

Capturing the African Moonfish on an underwater trail camera requires careful attention to light and positioning. These fish are benthic-oriented, meaning they spend much of their time near the bottom. For the best results, mount your camera 2-4 feet above a sandy or silty sea floor near a pier or natural reef edge. Angle the camera slightly downward to catch the school as they cruise through the lower third of the water column.

The biggest challenge with this species is 'backscatter' and glare. Their metallic skin is highly reflective; if you use a direct underwater flash at night, you will likely only see a white blur. Instead, set your camera to record during peak daylight hours—specifically between 10 AM and 2 PM—when natural sunlight is strongest and most vertical. This allows the camera to capture the natural iridescent sheen of their bodies without the harsh feedback of an artificial light source.

To draw a school into your camera's field of view, try using a 'shimmer lure' rather than organic bait. A small piece of highly polished metal or a silver fishing spoon suspended by a clear line a few feet from the lens will mimic the movement of prey or another moonfish, often drawing the entire school in to investigate. Ensure your camera is set to a high frame rate (60fps or higher) to capture the fluid, darting motions of the school without motion blur.

Similar Species

Species that look similar or are commonly confused with African Moonfish.

Lookdown

Found in the Western Atlantic (Americas); has even longer dorsal and anal fin filaments and a steeper, more angular head profile.

Atlantic Moonfish

A closely related species (*Selene setapinnis*) found in the Western Atlantic with a slightly less vertical head profile.

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Frequently Asked Questions

African Moonfish are primarily diurnal, meaning they are most active during daylight hours. They use the sun's light to help their silver bodies camouflage against the water column while they hunt for small fish and crustaceans.

Unlike many fish, African Moonfish are often more attracted to movement and reflection than scent. Hanging a shiny, reflective object like a metal spoon near your camera can pique the curiosity of a passing school and bring them into frame.

They are active predators that eat a variety of small marine life, including tiny schooling fish, shrimp, small crabs, and squid found near the ocean floor.

They are very common along the West African coast, particularly near fishing piers, estuaries, and sandy beaches. If you live near a coastal area in their range, they are one of the most likely 'silver fish' you will see in large schools.

While they look similar, the African Moonfish (Selene dorsalis) has a slightly more curved forehead compared to the nearly straight, vertical forehead of the Lookdown (Selene vomer), and is specifically found along the African coast rather than the Americas.

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