蓝刺尾鱼 Acanthurus coeruleus lán cì wěi yú

蓝刺尾鱼，（学名：Acanthurus coeruleus）。此鱼体呈卵圆形。侧身条纹随年龄阶段不同而改变。成鱼体为紫灰色，鱼鳍为蓝色，具白色边缘，尾鳍呈半月形，尾柄硬棘基部为鲜黄色，背鳍硬棘9枚、背鳍软条26至28枚、臀鳍硬棘3枚、臀鳍软条24至26枚。体长可达39厘米。幼鱼期为亮黄色，背鳍及尾鳍具蓝边，成熟后，蓝色代替了黄色，更加鲜艳，也可能出现黄尾巴。

百度翻译提供：

Blue thorn tail fish (scientific name: Acanthurus coeruleus). The fish is oval in shape. Side stripes vary with age. The adult fish is purple gray, the fin is blue with white edge, the tail fin is half moon, the base of the hard spine of the tail handle is bright yellow, 9 hard spines of the dorsal fin, 26-28 soft spines of the dorsal fin, 3 hard spines of the gluteal fin and 24-26 soft spines of the gluteal fin. The body length can reach 39 cm. The juvenile is bright yellow, and the dorsal fin and caudal fin have blue edges. After maturity, blue replaces yellow, which is more bright, and yellow tail may also appear.