Chrysiptera cyanea is a species of damselfish native to the Indian and western Pacific Oceans. Common names include blue damselfish, blue demoiselle, blue devil, cornflower sergeant-major, Hedley's damselfish, red tail Australian damsel, sapphire devil, and sky-blue damsel.
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This fish reaches 8.5 centimeters in length. It is bright blue in color; the male has a yellow snout and tail, and the female and juvenile usually lack yellow but have a black spot at the base of the back edge of the dorsal fin.
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