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The Sailfin Tang, Zebrasoma velifer, is a striking species of surgeonfish known for its exceptionally tall dorsal and anal fins, which can be erected to nearly double the body height, giving it a sail-like appearance. It is a popular aquarium fish due to its vibrant coloration and distinctive morphology. This species plays a crucial ecological role in coral reef ecosystems as a primary herbivore, grazing on benthic algae.
Physical Characteristics
- Body shape
- compressed
- Coloration
- Adults typically display a pattern of alternating dark brown to black and pale yellow to white vertical bands across the body. The head is often darker, and the fins are similarly banded. Juveniles are often more yellowish with broader dark bands. The coloration can intensify or fade depending on the fish's mood or stress level.
- Scale type
- ctenoid
- Mouth position
- terminal
- Distinctive features
- Extremely tall, sail-like dorsal and anal fins that can be erected., Elongated snout., Small, terminal mouth., A sharp, retractable scalpel-like spine (caudal peduncle spine) on each side of the caudal peduncle.
- Dorsal fin
- Single, very tall dorsal fin with 4-5 spines and 23-24 soft rays. When fully erect, it can be nearly as tall as the body length.
- Tail fin
- Truncate to slightly emarginate caudal fin.
- Pectoral fin
- Well-developed, fan-like pectoral fins.
- Distinctive fins
- Anal fin is also very tall, mirroring the dorsal fin, with 3 spines and 19-20 soft rays. Pelvic fins are small.
Identification Tips
Fin Height
The most distinguishing feature is the exceptionally tall dorsal and anal fins, which are much taller than those of most other tang species, especially when fully extended.
Body Pattern
Alternating dark and light vertical bands are characteristic, though the exact shade and width can vary with age and geographic location.
Snout Shape
Possesses a relatively elongated snout compared to other Zebrasoma species like the Yellow Tang (Z. flavescens).
Caudal Spine
Like all surgeonfish, it has a sharp, retractable spine on each side of the caudal peduncle (base of the tail). This is a defensive weapon.
Habitat
- Water type
- saltwater
- Depth
- Typically found in shallow to moderately deep waters, from 1 to 60 meters (3 to 200 feet).
- Environment
- Associated with coral reefs, rocky reefs, and lagoons. Prefers areas with abundant algal growth for grazing, often found near reef crests, slopes, and outer reef flats.
- Geographic range
- Widespread throughout the Indo-Pacific region. Its range extends from the Red Sea and East Africa eastward to the Hawaiian Islands and French Polynesia, and from southern Japan southward to Australia's Great Barrier Reef.
Aquarium Information
- Care level: intermediate
- Temperament: semi-aggressive
- Diet: herbivore
- Minimum tank size: 120 gallons (450 liters)
- Temperature: 72-78°F (22-26°C)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Generally compatible with other large, semi-aggressive fish. Can be aggressive towards other tangs, especially those of similar shape or coloration. Best kept as the only Zebrasoma species in a tank unless it is very large and introduced simultaneously.
- Special requirements: Requires a well-established aquarium with ample live rock for grazing and hiding. Strong water flow and excellent filtration are essential. A varied diet of marine algae, spirulina, and high-quality herbivore pellets is crucial for health and color. Prone to marine ich if stressed.
Wild Information
- Conservation status: least concern
- Seasonality: No specific seasonal patterns for availability; present year-round within its range.
- Market price: Varies, typically moderate to high for the aquarium trade.
- Commercial importance: medium
- Taste: Not commonly consumed due to potential for ciguatera poisoning in some regions and its value in the aquarium trade.
- Texture: Firm, white flesh (based on general surgeonfish characteristics).
- Cooking methods: Not typically a food fish.
- Nutritional value: Not widely studied for culinary purposes; likely similar to other reef fish in protein content.
Key Facts
Sail-like Finsamazing
The Sailfin Tang's dorsal and anal fins can be erected to an impressive height, sometimes nearly twice the body's depth, giving it its common name.
Algae Grazerbehavior
As a primary herbivore, Zebrasoma velifer plays a vital role in controlling algal growth on coral reefs, preventing overgrowth that could harm corals.
Color Changebehavior
Sailfin Tangs can rapidly change the intensity of their body coloration, often darkening when stressed or during territorial displays.
Juvenile Camouflagebehavior
Juvenile Sailfin Tangs often inhabit shallow, protected areas and their coloration provides excellent camouflage among corals and algae.
Safety Information
Handle with care- Safety level: caution
- Venomous: No
- Edibility: not recommended
- Handling notes: Like all surgeonfish, the Sailfin Tang possesses a pair of sharp, scalpel-like spines (caudal peduncle spines) on either side of the tail base. These spines are used for defense and can inflict deep cuts if the fish is handled carelessly or feels threatened. While not venomous, the wounds can be painful and prone to infection. Always use caution and avoid direct contact with the tail when handling.
Similar Species
Desjardin's Sailfin Tang
Zebrasoma desjardinii
Often confused with Z. velifer. Z. desjardinii typically has more numerous and narrower vertical bands, and often has small spots on the head and anterior body, which are generally absent or less pronounced in Z. velifer. The geographic range also differs, with Z. desjardinii primarily found in the Indian Ocean and Red Sea, while Z. velifer is more widespread in the Pacific.
Yellow Tang
Zebrasoma flavescens
While also a Zebrasoma, the Yellow Tang is uniformly bright yellow and lacks the prominent vertical banding and extremely tall fins of the Sailfin Tang. Its body is also more oval and less disc-like.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Acanthuriformes
- Family
- Acanthuridae
- Genus
- Zebrasoma
- Species
- velifer
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