The operculum
no.
This is called the operculum
The flap of tissue that covers a bony fish gill is the bony operculum.
The operculum of a perch, or any bony fish, is located behind the jaw and face, just in front of the pectoral fin.
Externally
Agnatha is a superclass of the phylum Chordata. It contains the jawless fish. Two common examples of this would be the lamprey and the hagfish.
Agnatha are ancient jawless fish that include lampreys and hagfish. They are also probably the earliest vertebrates and have ectoderm.
The fin located behind the operculum on a perch fish is the Pectural Fins (paired).
i believe muscular
skin
without jaws