EntityQ1575967· pop 25· linked from 861 articlesoperculumSign in to savebones in a fish that provide facial support structure and a protective covering for the gillsConnectionsOsteichthyesEntityChimaeriformesEntitydemersalEntityfishEntitytoothEntitysharkEntityfishingEntitybreathingEntitydigital object identifierEntityChondrichthyesEntityActinopterygiiEntityBatomorphiEntitygillEntityichthyologyEntityExocoetidaeEntityEuropean perchEntitySarcopterygiiEntityAgnathaEntityEngraulidaeEntityJSTOREntityCategoriesFish anatomy