Fish diurnal

Jewel Damsel

Stegastes lacrymatus

The sparkling sentinel of the Indo-Pacific, the Jewel Damselfish is a pint-sized powerhouse known for its sapphire spots and fierce devotion to its underwater garden.

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Quick Identification

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Size

Up to 10 cm (3.9 inches) in length

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Colors

Dark chocolate brown to black body covered in brilliant sapphire-blue spots; adults often feature a pale yellow or translucent tail fin.

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Key Features

Electric blue 'jewel' spots across a dark body
Dusky yellow or pale translucent tail
Single continuous dorsal fin with a rounded profile
Highly territorial 'gardening' behavior

When You’ll See Them

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Activity pattern diurnal

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Peak hours 8:00 AM – 5:00 PM

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Season Year-round

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Diet Primarily herbivorous, they 'farm' filamentous algae on reef surfaces, but they will also opportunistically eat small crustaceans and plankton passing in the current.

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Habitat Shallow tropical reefs, lagoons, and reef flats with plenty of coral rubble or rock for shelter.

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Behavior

The Jewel Damselfish is the 'grumpy gardener' of the reef world. They are best known for their intense territoriality, where they claim a specific patch of coral rubble or rock to grow their own private 'algae farm.' They spend their days weeding out unpalatable algae and defending their crop against intruders, including fish many times their size.

Socially, they are solitary and rarely venture more than a few feet from their home base. They are surprisingly bold; if a camera or a human gets too close to their garden, they will fearlessly charge and occasionally 'nip' to signal that the visitor is unwelcome. This high-energy personality makes them a favorite for underwater observers.

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Camera Tips

To capture a Jewel Damselfish on camera, you need to think like a reef explorer. If you live in a coastal tropical area or maintain a large home reef aquarium, look for a specific 'clean' patch of rock—this is likely their algae farm. Position your underwater camera or reef-safe housing on a weighted tripod about 12 to 18 inches away from this patch. These fish are creatures of habit and will return to the same spot repeatedly, making them excellent subjects for time-lapse or motion-triggered video.

Lighting is your biggest challenge underwater. If filming in a backyard tide pool or shallow reef, try to shoot during high-noon when the sun is directly overhead to penetrate the water. For home reef tanks, ensure your AI camera is calibrated for high blue-light environments, as the Jewel Damselfish’s sapphire spots can 'bloom' or blur under heavy actinic lighting. Use a macro lens if possible; their intricate blue spots are best appreciated in high-definition close-ups.

Because they are territorial, you don't actually need bait. In fact, their own reflection in a camera lens is often enough of a 'lure' to bring them right up to the glass for an aggressive display. However, if you want to keep them in frame longer, placing a small piece of nori (dried seaweed) on a clip nearby will encourage them to perform their unique 'weeding' and feeding behaviors. Set your camera to a fast shutter speed, as their movements are quick and darting rather than rhythmic like larger reef fish.

Similar Species

Species that look similar or are commonly confused with Jewel Damsel.

Blue Velvet Damselfish

Features bright blue electric stripes and a more elongated body compared to the circular spots of the Jewel Damselfish.

Dusky Damselfish

Lacks the brilliant blue spots and usually has a much darker, more uniform gray or black tail fin.

Frequently Asked Questions

Jewel Damselfish are strictly diurnal, meaning they are active during the daylight hours. They are most visible from mid-morning to late afternoon when the sun is high enough to illuminate the algae they farm and eat.

Unless your 'backyard' is a coastal reef in the Indo-Pacific, you can't attract them to a traditional garden. However, they are popular in the reef aquarium hobby. To attract them to a specific spot for a camera, provide a flat, stable rock surface where they can establish an algae farm.

Their diet consists mostly of filamentous algae that they grow themselves. They act as farmers, protecting their patch from other herbivores. They also supplement this with small invertebrates and occasional snacks of plankton.

They are only common in suburban areas that are adjacent to tropical coastlines or in homes with saltwater reef aquariums. They are a widespread species across the Indo-Pacific, from the Red Sea to Australia.

Look for the distinct blue spots on a very dark, chocolate-brown body. Unlike the Blue Velvet Damselfish which has iridescent lines, the Jewel Damselfish has individual 'sparkles.' Additionally, adults have a pale yellow tail that contrasts sharply with their dark body.

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