Fish Active during the day

Beaugregory

Stegastes leucostictus

iNaturalist Wikipedia

The Beaugregory is the feisty 'gardener' of the Atlantic shallows. With its neon-spotted juvenile phase and fiercely territorial nature, this small damselfish brings big personality to every reef and dockside.

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Quick Identification

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Size

Typically 8 to 10 cm (3 to 4 inches) in length; weight is usually between 15 and 40 grams (0.5 to 1.4 ounces).

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Colors

Juveniles are vibrant yellow with bright blue spots on the upper body; adults fade to a more muted olive-brown or dusky yellow with dark-edged scales.

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Key Features

Brilliant iridescent blue spots along the back and dorsal fin in juveniles
Small, oval-shaped body with a single, continuous dorsal fin
Extremely aggressive and territorial behavior near rocky crevices
Dusky yellow to brownish-olive adult coloration

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 herbivorous, they 'farm' and consume filamentous algae, but they also supplement their diet with small invertebrates, sponges, and occasionally fish eggs.

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Habitat Shallow reef flats, seagrass beds, rocky rubble, and artificial structures like docks or shipwrecks.

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Where Does the Beaugregory Live?

The Beaugregory is a quintessential resident of the Western Atlantic's warm coastal waters. This species is found from the sun-drenched shores of Florida and the Gulf of Mexico, stretching through the entire Caribbean basin and the Bahamas, and extending as far south as the coast of Brazil. They are particularly abundant in clear, shallow lagoons and reef systems where sunlight can easily reach the sea floor to fuel the growth of their essential algae gardens.

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8 Countries

4.5M km² Range

Least Concern Conservation

US United States Bahamas MX Mexico BR Brazil Cuba Jamaica Dominican Republic BZ Belize

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iNaturalist / Verified observation data

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Behavior

The Beaugregory is a remarkably feisty and territorial member of the damselfish family. Known as an 'algal farmer,' each individual defends a small patch of the sea floor, where it carefully manages the growth of specific types of algae. They are incredibly protective of these gardens, aggressively chasing away much larger herbivorous fish, such as parrotfish or surgeonfish, that attempt to graze on their crop. Even human divers who get too close may find themselves being 'charged' by these brave little fish.

These fish are strictly diurnal, meaning they are active during the daylight hours and retreat into deep crevices or holes in the reef at night to sleep. Their social structure is defined by these individual territories; while they live in high densities in suitable habitats, they are not schooling fish and will constantly patrol their boundaries. During the breeding season, males become even more aggressive, clearing a nest site on a flat stone or inside a shell and performing zig-zag swimming displays to attract females.

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Camera Tips

Capturing high-quality footage of a Beaugregory requires a specialized underwater camera setup, as these fish rarely venture far from their sheltered reef homes. If you have a dock, sea wall, or waterfront property in a tropical region, the best approach is to mount an AI-powered underwater camera to a fixed structure about 2 to 4 feet below the surface. Look for a 'hub' of activity—usually a rock pile or a cluster of coral—where a fish seems to return repeatedly. This is likely its territory, and it provides a predictable stage for your lens.

Placement is everything with damselfish. Position the camera lens about 12 to 18 inches away from a flat, algae-covered rock or a specific crevice. Because Beaugregory are curious and territorial, they will often approach the camera to investigate or 'defend' their territory against the lens, providing excellent close-up opportunities. Avoid using bright artificial lights during the day, as the natural sunlight filtered through the water provides the most realistic color for their iridescent blue spots. However, if your camera is in a shaded area under a dock, a subtle, diffused fill light can help reveal the intricate scale patterns of adults.

While you shouldn't use heavy chum which attracts large predators, you can encourage Beaugregory activity by creating a small 'rock garden' in front of your camera. Using porous limestone rocks with plenty of small holes will encourage them to move in and set up a permanent territory. For the best AI detection, set your camera to a high frame rate (at least 60 fps) to capture their quick, darting movements, and ensure the lens is clean of biofouling or algae every few days to maintain crisp focus on these small subjects.

Similar Species

Species that look similar or are commonly confused with Beaugregory.

Longfin Damselfish

Longfin Damselfish adults are much darker (almost black) and have more elongated dorsal and anal fins.

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Frequently Asked Questions

Beaugregory are strictly diurnal, meaning they are most active during the day. They typically emerge from their rocky hiding spots shortly after sunrise to begin patrolling their territories and 'farming' algae, and they return to cover at sunset.

The best way to attract Beaugregory is to provide structure. Adding a small pile of clean limestone rocks or ensuring your dock pilings have rough surfaces where algae can grow will encourage a damselfish to claim the area as its territory. They do not respond well to traditional bait, as they are primarily algae-eaters.

Beaugregory primarily eat algae that they 'farm' within their territory. They also eat small crustaceans, polychaete worms, and occasionally sponges or the eggs of other fish.

Yes, they are very common around man-made structures in coastal suburban areas throughout Florida and the Caribbean. You can often find them living in the nooks and crannies of sea walls, bridge pilings, and private boat docks.

You can tell them apart by looking at the spots. Juvenile Beaugregory have blue spots on their back that do not extend onto the tail base, whereas juvenile Cocoa Damselfish have a distinct dark spot on the upper part of the tail base (caudal peduncle).

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