What Is the Function of the Operculum in Bony Fish?

Answer

The operculum on a bony fish has the function to cover and protect the gills. It also marks the division between the head and the body. The gills are used to help the fish breathe.
Reference:
Q&A Related to "What Is the Function of the Operculum in Bony..."
its helps save the gills.
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The adaptation that made bony fish what they are was an internal, ossified skeleton. The skeleton afforded the fish greater mobility to feed, which it largely did by sucking and filtering
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For the fishes, I would add, members of the family Mormyridae, many of which are known as "elephantfish" would rank at the top. They have the highest brain to body ratio
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Gall bladder: small sac containing the bile. Bile breaks down
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