Fish diurnal

Beaugregory

Stegastes leucostictus

A pint-sized powerhouse of the coastal shallows, the Beaugregory combines electric juvenile colors with a fearless personality. Watch these dedicated 'algae gardeners' defend their tiny territories with more bravado than fish ten times their size.

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Quick Identification

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Size

Typically 3 to 4 inches (7.5 to 10 cm) in length; maximum recorded size is approximately 5 inches (12.5 cm).

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Colors

Juveniles are brilliant electric blue on the upper half and bright yellow on the lower half; adults fade to a more muted olive-brown or dusky yellow with lingering blue spots on the scales.

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Key Features

Electric blue iridescent spots on the head and upper back
A distinctive dark spot (ocellus) on the rear of the dorsal fin
Deep, oval-shaped body with a small, pouting mouth
Yellowish pelvic and anal fins in both life stages
Aggressive, territorial posturing toward intruders

When You’ll See Them

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Activity pattern diurnal

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Peak hours 6 AM - 6 PM (Daylight hours with peak activity during high sun)

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Season Year-round

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Diet Primarily an herbivore that 'farms' filamentous algae, but will also opportunistically eat small crustaceans, polychaete worms, and organic detritus.

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Habitat Shallow coastal waters, coral reefs, rocky shorelines, seagrass beds, and man-made structures like sea walls and dock pilings.

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Behavior

The Beaugregory is the tiny, fearless landlord of the Atlantic shallows. Despite their small size, these damselfish are famously pugnacious, claiming a territory of just a few square feet and defending it against fish many times their size—including human snorkelers. They are primarily 'farmers' that carefully tend to small patches of filamentous algae, 'weeding' out unpalatable species to ensure a steady food supply.

Socially, they are solitary and highly competitive. During the spawning season, the male undergoes a color change to attract females to his carefully prepared nesting site, usually under a flat rock or inside a discarded shell. Once the eggs are laid, the male takes over full-time sentry duty, fanning the eggs with his fins to provide oxygen and fiercely attacking anything that ventures too close to his brood.

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Camera Tips

To capture high-quality footage of a Beaugregory, focus your efforts on 'structure' in the shallows. If you have a waterfront dock or sea wall, these are prime real estate for this species. Mount your underwater camera 2 to 4 feet below the surface, ideally facing a rocky crevice or a cluster of oysters. These fish are remarkably site-faithful; once they claim a spot, they will likely remain there for their entire adult life, making them one of the most reliable subjects for a stationary backyard dock camera.

Beaugregories are naturally curious and highly territorial, which works to a photographer's advantage. They are often attracted to the reflection of the camera lens, viewing it as a potential rival intruder. This often results in 'confrontation' footage where the fish swims directly into the frame to display its fins or attempt a nip at the lens. To capture the best colors—especially the vibrant blues of the juveniles—ensure your camera is positioned to receive plenty of natural sunlight. If your camera allows for manual white balance, set it to 'underwater' or 'cloudy' to help pull out the yellows and oranges that are often lost in the blue spectrum of the water.

Since these fish move in quick, darting bursts, use a high frame rate setting (at least 60fps) to avoid motion blur. You don't need traditional bait for this species; instead, look for their 'algae gardens.' If you see a patch of reef that looks cleaner and greener than the surrounding area, that is likely a Beaugregory's farm. Placing your camera near this garden will ensure you capture their fascinating maintenance behaviors. During the summer spawning months, keep an eye out for males displaying more intense colors, as this is the best time to record their unique courtship 'dances' and high-intensity territorial defense.

Similar Species

Species that look similar or are commonly confused with Beaugregory.

Cocoa Damselfish

Very similar in color but usually has a second dark spot on the upper base of the tail, whereas the Beaugregory usually only has the dorsal spot.

Dusky Damselfish

Lacks the bright yellow lower body of the Beaugregory and is generally much darker overall, with a more rounded dorsal fin.

Longfin Damselfish

Has much longer, more pointed trailing edges on the dorsal and anal fins and generally lacks the bright blue juvenile spots.

Frequently Asked Questions

Beaugregory are strictly diurnal, meaning they are active during the day. They are most visible when the sun is high, which promotes the growth of the algae they farm and eat.

If you live on the coast, you can attract Beaugregory by providing structure. Submerged rock piles, limestone blocks, or even clean PVC pipes near a dock will quickly be claimed as territory by these fish.

They are primarily herbivores that eat filamentous algae. They are unique for 'farming' their own algae patches, though they will also eat small invertebrates and organic matter found in the water.

Yes, they are very common in suburban coastal areas with man-made structures. You can frequently find them living along sea walls, canal banks, and under private boat docks in Florida and the Caribbean.

The easiest way is to look at the spot on their tail. In Beaugregories, the dark spot is usually on the dorsal fin, whereas in Cocoa Damselfish, a second spot is often found on the top of the tail base (caudal peduncle).

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