Fish Active during the day

Purple Reeffish

Chromis scotti

iNaturalist Wikipedia

A hidden gem of the deep reef, the Purple Reeffish shimmers with electric neon spots and a royal violet body. This small but vibrant fish brings a splash of tropical brilliance to the seaward slopes of the Atlantic.

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Quick Identification

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Size

Small and compact, typically reaching 2 to 4 inches (5 to 10 cm) in length.

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Colors

Deep purple to royal blue body with striking neon blue spots on the head and upper back; some individuals show a subtle yellowish cast on the tail.

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Key Features

Intense violet or deep blue body coloration
Vibrant neon blue dots concentrated near the eyes and dorsal area
Oval-shaped profile with a deeply forked caudal fin
Primarily found on deeper reef slopes rather than shallow flats

When You’ll See Them

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Activity pattern Active during the day

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Peak hours 9 AM - 4 PM

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Season Year-round

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Diet A specialized planktivore that feeds on zooplankton drifting in the water column; occasionally grazes on benthic algae.

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Habitat Deep coral reefs, seaward slopes, and rocky drop-offs, typically at depths of 30 to 100 feet.

public Geographic range

Where Does the Purple Reeffish Live?

Native to the Western Atlantic Ocean, the Purple Reeffish is a staple of tropical reef systems. Its core range extends from the warm waters of southern Florida and the Bahamas through the entire Caribbean Sea. It is also commonly found along the Gulf of Mexico and reaches as far south as the northern coastline of Brazil, making it a widespread species across the tropical Americas.

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8 Countries

3.5M km² Range

Least Concern Conservation

US United States Bahamas MX Mexico Cuba Jamaica

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iNaturalist / Verified observation data

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Behavior

Purple Reeffish are social yet cautious residents of the reef, typically seen in loose aggregations hovering just a few feet above coral structures. They are remarkably adapted to life in the water column, where they spend most of their daylight hours picking tiny zooplankton from the passing current. Despite their social nature, they are quick to retreat into the safety of reef crevices or branching corals if they sense a predator nearby.

During the breeding season, these fish exhibit fascinating reproductive behaviors. Males become territorial and claim a patch of hard substrate, such as a flat rock or a piece of coral rubble, which they clean meticulously. After attracting a female with a series of rapid swimming displays, the male guards the sticky eggs until they hatch. During this period, the male is surprisingly bold, fanning the eggs to ensure they stay oxygenated and chasing away much larger intruders.

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Camera Tips

Capturing high-quality footage of the Purple Reeffish requires underwater equipment capable of handling depth, as these fish are most abundant below 30 feet where light begins to fade. Because red and orange light wavelengths are absorbed quickly by seawater, your camera will likely record a heavy blue or green cast. To reveal the fish's namesake purple hue and neon spots, use a powerful external video light or a red filter suited for tropical water. A stationary camera mount, such as a weighted tripod or a clamp attached to a non-living reef structure, is essential for steady shots in moving currents.

Placement is key: look for large coral 'heads' or rocky outcrops that stick out into the current, as Purple Reeffish tend to hover on the up-current side to catch food. Aim the camera at the edge of the reef where the structure meets the open water. Since these fish are relatively small, a macro lens or a close-focus setting is ideal, but be sure to keep the camera at least 12-18 inches away to avoid spooking the school. Setting your camera to a high frame rate, like 60 or 120 fps, will allow you to capture their quick, darting movements in smooth slow motion.

For the best results, use a 'set it and forget it' approach. Many reef fish are wary of the bubbles and movement of divers. By leaving a remote-activated or time-lapse camera in a high-traffic reef area and swimming several yards away, you allow the fish to return to their natural hovering behavior. They are most active during the middle of the day when the sun is directly overhead, providing the best possible natural light to supplement your artificial sources.

Similar Species

Species that look similar or are commonly confused with Purple Reeffish.

Blue Chromis

Brighter, neon-blue body with a more slender shape and lacks the neon spotting on the forehead.

Sunshinefish

Features a distinct yellow upper body and head, contrasting with a silver or white lower half.

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Frequently Asked Questions

Purple Reeffish are strictly diurnal, meaning they are active during the day. They feed most heavily in the mid-morning and afternoon when sunlight penetrates the reef and plankton is abundant in the currents.

Because Purple Reeffish are marine animals, they cannot be attracted to a traditional backyard. However, for reef aquarium enthusiasts, they are attracted to moderate water flow and regular feedings of mysis shrimp or plankton-based foods.

In their natural habitat, Purple Reeffish eat zooplankton. They hover above the reef and pick tiny organisms like copepods and larval invertebrates directly out of the water column.

No, they are only found in marine environments, specifically coral reefs in the Western Atlantic. They are never found in freshwater or land-based suburban areas.

While both are blue, the Purple Reeffish (Chromis scotti) is a deeper violet and has distinct neon blue spots on its head. The Blue Chromis (Chromis cyanea) is a brighter, sky-blue color and lacks those specific spots.

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