Chrysiptera cyanea
species of fish
Chrysiptera cyanea is a species of damselfish found in the wide Indo-West Pacific but not known in the Red Sea. A few individuals were observed in the Mediterranean Sea in 2013 off Slovenia, a likely aquarium release.
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.
Description
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.
Behavior
The fish inhabits reefs and lagoons. Its diet includes algae, tunicates, and copepods. Male and female pair up for breeding, and the male guards and tends the eggs.
In aquarium
It is very aggressive. A matched couple often attacks any same size fish approaching its breeding territory.
The public source identifies “Chrysiptera cyanea” as species of fish. This brief keeps that definition visible, then builds a research path around Chrysiptera, cyanea and species.
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The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated Jul 28, 2026. The linked authority identifier is Q1123833. None of the 0 selected statements returned an explicit reference. The first chronological checks are 2013.
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This entry incorporates text from “Chrysiptera cyanea” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.