What is Operculum?
[[File:Kiemendeckelknochen.jpg|thumb|A drawing showing the head of a [[perch]], from the side. The different bones that make up the operculum are shown in color.]] In [[fish]], an '''operculum''' is a structure made of [[bone]] that covers and protects the [[Gill|gills]]. {{biology-stub}} [[Category:Animal anatomy]] [[Category:Fish]]