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Chromis opercularis is a species of damselfish belonging to the family Pomacentridae. Here are some key characteristics and information about Chromis opercularis:

1. Appearance: Chromis opercularis has a streamlined and oval-shaped body typical of damselfishes. It is generally silvery-blue to bluish-green in color with a darker shade on the dorsal side and lighter coloration ventrally. The scales may have a shimmering effect under certain lighting conditions.
2. Size: They typically grow to about 10-12 cm (4-5 inches) in length.
3. Distribution: This species is found in the eastern Atlantic Ocean, particularly along the western coasts of Europe from Norway to the Canary Islands, including the Mediterranean Sea.