A flap of skin protecting a fish’s gills, typically stiffened by bony plates. Also called operculum.
- The gill cover and dorsal, pelvic, anal, and caudal fins possess large red blotches.
- The opercular series comprises each gill cover and generally consists of four bones.
- Next, place two fingers just into the gill cover and slide the fingers forward until you reach the jaw bone.
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Syllabification: gill cov·er
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