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Northwest to West Central Atlantic: from Massachusetts and Bermuda to Trinidad and Tobago, including the Gulf of Mexico and the islands of the Caribbean. 西大西洋: 美國麻薩諸塞州與百慕達群島向南至墨西哥灣 (除了東北) 與巴西。 東大西洋: 阿森松島與聖赫勒拿島 (參考文獻 7345) 外海的安哥拉.(參考文獻 26938) 可能是一個地點錯誤的來自塞錫爾群島的一個最近的記錄.(參考文獻 13442)
初熟時的長度 / 大小 / 重量 / 年齡
成熟度: Lm15.5, range 9 - ? cm Max length : 38.1 cm SL 雄魚/尚未辨別雌雄; (Ref. 9761); common length : 25.0 cm TL 雄魚/尚未辨別雌雄; (Ref. 3142); 最大年齡: 31 年 (Ref. 52229)
背棘 (總數) : 9; 背的軟條 (總數) : 23 - 26; 臀棘: 3; 臀鰭軟條: 21 - 23. This species is distinguished by the following set of characters: D IX, 23-26; A III, 21-23; pectoral rays 15-17; gill rakers 18-24; covered with very small ctenoid scales; spatulate teeth have denticulate edges, upper jaw with 14, lower jaw 16; body depth about 2.0 in standard length; caudal fin lunate, concavity of caudal fin 5.0-12.0 in SL, more concave in adults; length of caudal spine 3.0-3.5 in SL; eye diameter 3.0-3.5 in head length; colour of body yellowish to grayish brown, without dark vertical bars; yellow lines radiating from the posterior margin of eye; translucent pectoral fin with yellow tints; white or pale spot at the base of caudal fin; posterior margin of caudal, anal and dorsal fins have light blue or white margin (Ref. 87362).. Body shape (shape guide): short and / or deep; Cross section: compressed. 尾鰭一般邊緣微凹.(參考文獻 13442) 頭部與身體深的而且扁長形的.(參考文獻 26938)
Inhabits shallow bottoms with coral or rocky formations (Ref. 13628); also found around inshore rocky areas with patches of sand, feeding primarily on benthic algae and occasionally grazing on seagrass beds (Ref. 87362). Usually occurs in groups of five or more individuals. Mainly diurnal species. The spine on both sides of the caudal peduncle may inflict painful wounds (Ref. 5217). Marketed fresh. Minimum depth reported from Ref. 27115. Previously reported longevity of 31 years from Ref. 52229 refers to Acanthurus bahianus, a case of misidentification.
Bernal, M.A. and L.A. Rocha, 2011. Acanthurus tractus Poey, 1860, a valid western Atlantic species of surgeonfish (Teleostei, Acanthuridae), distinct from Acanthurus bahianus Castelnau, 1855. Zootaxa 2905:63-68. (Ref. 87362)
