Acanthurus Achilles x Nigricans Hybrid
The hybrid surgeonfish Acanthurus achilles xAcanthurus nigricans is a rare and striking hybrid between two highly prized species of the Acanthuridae family: the Achilles Tang (A. achilles) and the Whitecheek Tang (A. nigricans). This hybrid occurs primarily in areas where the habitats of the two species overlap, such as the central and western Pacific.
Behavior: Active, often aggressive towards other tangs, especially of the same genus
Aquarium Suitable: Yes, but requires a very large and mature marine aquarium (>600 liters)
Diet: Primarily herbivorous, but will accept a variety of foods (algae, spirulina, enriched foods)
Difficulty of Maintenance: High – sensitive to water parameters and diseases (such as Marine Ich)
Ideal for collectors or advanced aquarists.
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Scientific Name: No official scientific name; reported as Acanthurus achillesxnigricans
Family: Acanthuridae (Surgeonfish)
Common Names: Hybrid Achilles Tang, Achilles x Nigricans Hybrid
Origin: Pacific Ocean – mainly in areas where the habitats of the two parent species overlap (e.g. Micronesia, Hawaii, Marquesas Islands)
Appearance:
This fish has a mixture of characteristics from both species:
Body Color: Deep black or dark brown, with a metallic sheen
Markings: Orange or reddish strokes at the base of the tail and around the fins (characteristic of Achilles). White stripe behind the gills and white outline on the fins (characteristic of Nigricans).
Caudal fin: Often with a bright orange curve or "teardrop" – characteristic of Achilles
Size: Approximately 20–25 cm
Extremely rare and expensive in trade – often collected to order.
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