![Black Back Butterflyfish](http://1fish2fishdartmouth.com/cdn/shop/products/1_jpeg_4d084b30-f7fb-44d7-997f-1b6455cb97eb_{width}x.jpg?v=1574368757)
This fish grows up to 18 cm (c. 7 in) long, and may live for up to 20 years. When observed at night or when frightened, this species changes color; the dorsal portion of the body turns black except for two white patches.[2]
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