Chocolate Tang and Similar Species
Acanthurus thompsoni
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Open the appSeveral fish can be confused with Chocolate Tang. Here are the key differences.
Species often confused with {name}
Black Tang
Acanthurus nigricans
Key differences: Acanthurus nigricans (Goldrim Tang or Black Tang) has a black body but typically features a prominent yellow stripe along the dorsal fin base, a yellow caudal fin, and a white band at the base of the pectoral fin. A. thompsoni lacks these distinct yellow and white markings.
Whitecheek Surgeonfish
Acanthurus nigricans (often confused due to common name 'Black Tang')
Key differences: While A. nigricans is sometimes called 'Black Tang', it's distinct. Another species, Acanthurus leucocheilus (Whitecheek Surgeonfish), is also dark but has a prominent white patch on the cheek and a white caudal fin, which A. thompsoni lacks.
Brown Tang
Acanthurus nigrofuscus
Key differences: Acanthurus nigrofuscus (Brown Tang or Lavender Tang) is also brown but typically has a more oval body, a dark spot at the base of the soft dorsal and anal fins, and often a yellowish caudal fin. Its body is also usually lighter brown than the deep chocolate of A. thompsoni.
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