The flap of tissue that covers a bony fish gill is the bony
operculum.
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The gills of a fish.
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The fin located behind the operculum on a perch fish is the
Pectural Fins (paired).
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Jawless fish are cartilaginous, but they do not have jaws. Class
Chondrichthyes, which contains most cartilaginous fish, like
sharks, have powerful jaws.