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The Teardrop Butterflyfish (Chaetodon unimaculatus) is a striking marine fish belonging to the family Chaetodontidae. It is characterized by its vibrant yellow body and a distinctive black, tear-shaped spot on its upper flank. This species is a common inhabitant of coral reefs across the Indo-Pacific, where it plays a role in the reef ecosystem by feeding on a variety of benthic invertebrates and coral polyps. It is a popular species in the aquarium trade due to its attractive coloration and relatively peaceful demeanor, though its specialized diet can pose challenges for long-term captive care.
Physical Characteristics
- Body shape
- compressed
- Coloration
- The body is predominantly bright yellow, transitioning to white or pale yellow on the ventral side. A prominent, black, tear-shaped or oval spot is located on the upper flank, just below the anterior part of the dorsal fin. A thin, black vertical bar runs through the eye. The dorsal, anal, and caudal fins are typically yellow, often with a thin white or pale blue margin.
- Scale type
- ctenoid
- Mouth position
- terminal
- Distinctive features
- Bright yellow body coloration, Single, prominent black tear-shaped spot on the upper flank, Black bar through the eye
- Dorsal fin
- Typically 13-14 dorsal spines and 19-23 soft rays. The spiny portion is continuous with the soft-rayed portion.
- Tail fin
- Caudal fin is truncate to slightly rounded.
- Pectoral fin
- Pectoral fins are clear to yellowish.
- Distinctive fins
- Anal fin has 3 spines and 18-21 soft rays. Pelvic fins are yellow.
Identification Tips
Body Color
Look for the vibrant yellow body, which is a key identifier.
Black Spot
The single, distinct black tear-shaped or oval spot on the upper flank is the most definitive characteristic.
Eye Bar
A thin black vertical bar passing through the eye helps distinguish it from some other yellow butterflyfish species.
Habitat
- Water type
- saltwater
- Depth
- Typically found at depths of 1-60 meters (3-200 feet), most commonly in shallower reef areas.
- Environment
- Inhabits coral-rich areas of lagoons, outer reef slopes, and channels. Prefers areas with abundant live coral growth, particularly branching corals, which provide shelter and food sources.
- Geographic range
- Widespread throughout the Indo-Pacific region. Its range extends from East Africa, including the Red Sea, across the Indian Ocean to the central Pacific, including Hawaii, French Polynesia, and the Pitcairn Islands. North to southern Japan and south to Australia (Great Barrier Reef) and New Caledonia.
Aquarium Information
- Care level: intermediate
- Temperament: peaceful
- Diet: omnivore
- Minimum tank size: 75 gallons (280 liters)
- Temperature: 72-78°F (22-26°C)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Generally peaceful with other non-aggressive fish. Can be kept singly, in pairs, or in small groups in very large aquariums. May nip at corals, especially LPS and some soft corals, making it not strictly reef-safe.
- Special requirements: Requires a well-established aquarium with plenty of live rock for grazing and hiding. A varied diet including high-quality marine flakes, pellets, frozen mysis shrimp, brine shrimp, and finely chopped seafood is essential. Regular feedings (2-3 times daily) are recommended. Good water quality and stable parameters are crucial for its health.
Wild Information
- Conservation status: least concern
- Seasonality: No specific seasonal behavior patterns for reproduction or migration are widely documented; breeding typically occurs year-round in tropical waters.
- Market price: Varies depending on size and region, typically moderate for the aquarium trade.
- Commercial importance: medium
- Taste: Not typically consumed due to small size and reef-dwelling nature.
- Texture: Not typically consumed.
- Nutritional value: Not typically consumed.
Key Facts
Spot for Protectionbehavior
The prominent black tear-shaped spot on its flank is thought to be an 'eyespot' or ocellus, which may confuse predators by drawing attention away from the actual eye or by making the fish appear larger.
Coral Nibblerbehavior
While not an obligate corallivore, the Teardrop Butterflyfish is known to feed on coral polyps, particularly those of stony corals, which can make it a challenging addition to some reef aquariums.
Pair Bondingbehavior
Teardrop Butterflyfish are often observed in pairs, especially during breeding season, and these pairs may maintain territories on the reef.
Wide Distributioninteresting
This species boasts one of the widest distributions among butterflyfishes, spanning a vast area of the Indo-Pacific.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: not recommended
- Handling notes: No specific handling precautions beyond standard care for marine fish. Avoid direct contact with spines, though they are not venomous. Handle gently to minimize stress and injury.
Similar Species
Latticed Butterflyfish
Chaetodon rafflesii
C. rafflesii has a reticulated or 'latticed' pattern over its body and lacks the distinct tear-shaped spot of C. unimaculatus. Its body color is also more orange-yellow.
Yellow Butterflyfish
Chaetodon xanthurus
C. xanthurus has a yellow body but typically features a white caudal fin with a black submarginal band and lacks the prominent black tear-shaped spot on the flank. It also has a more pronounced black bar through the eye and a black spot on the caudal peduncle.
Ornate Butterflyfish
Chaetodon ornatissimus
C. ornatissimus has a white body with prominent orange-yellow diagonal stripes and lacks the single black spot. It is also a more obligate corallivore.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Perciformes
- Family
- Chaetodontidae
- Genus
- Chaetodon
- Species
- unimaculatus
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