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Male of Threadfin Anthias - Pseudanthias huchti, lavender-grey to yellowish grey; bright red stripe from eye to pectoral fin base, red border on ventral fins; long 3rd dorsal spine. Seen in this picture flashing his long dorsal fin which gave them their common name, Threadfin. They do this when challenging other males and/or when keeping the females in their group interested.
Shallow tropical reefs. They are usually found in big groups and feeds in the water column when there is running current, which brings planktons and other tiny pelagic stuff.