红尾蝴蝶鱼 hóng wěi hú dié yú

红尾蝴蝶鱼，【Chaetodon xanthurus】又称黄蝴蝶鱼，俗名黄网蝶，为辐鳍鱼纲鲈形目蝴蝶鱼科的其中一种。体极为侧扁，吻小、突出。头部上方具一黑斑，眼部具黑横带。鱼体体色银白，体侧鳞片之黑缘形成网状花纹；背鳍後半部到臀鳍後有一橙色新月形横带，尾鳍亦具橙色带。幼鱼与成鱼的差异不大。

百度翻译提供：

Red tailed butterfly fish, [Chaetodon xanthurus], also known as yellow butterfly fish, commonly known as yellow net butterfly, is one of the butterfly fish families of Perciformes in the class of radial fin fish. The body is extremely flat on the side, and the kiss is small and prominent. There is a black spot above the head and a black transverse band around the eyes. The body color of the fish is silvery white, and the black edge of the side scales forms a reticular pattern; There is an orange crescent shaped transverse band from the back half of the dorsal fin to the back of the gluteal fin, and the caudal fin also has an orange band. There is little difference between young fish and adult fish.