黑背蝴蝶鱼 Chaetodon melannotus hēi bèi hú dié yú

黑背蝴蝶鱼,【Chaetodon melannotus】俗名曙色蝶，为蝴蝶鱼科，蝴蝶鱼属鱼类。为观赏鱼类。因鱼体色为银白色有黑斜纹，背鳍下方呈灰黑色，越靠近背鳍颜色越黑，好似曙光微露，因此得名。性情温和，容易饲养，而且常见度高。适合与温和的鱼混养。

百度翻译提供：

Black backed butterfly fish, [Chaetodon melanotus], commonly known as dawn butterfly, belongs to the family Phalaenopsis and belongs to the genus Phalaenopsis. For ornamental fish. Because the fish is silvery white with black twill, and the lower part of the dorsal fin is gray black, the closer it is to the dorsal fin, the darker it is, like the dawn, so it is named. Mild temperament, easy to raise, and high frequency. Suitable for mixed culture with mild fish.