Most bony fishes have a hard plate that covers the gills on each side of the head called the

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The operculum is a bony plate that covers the gills on either side of the fish's head. This allows for the fish to pump water over their gills, allowing for gas exchange to occur. The pharyngeal slits are openings in the pharynx that allow water to exit after passing over the gills. The lateral line is a sensory organ that allows fish to detect changes in pressure and movement in the water. The radula is a structure found in mollusks used for feeding. Gill arches are the skeletal structures that support the gills.

Most Bony Fishes Have a Hard Plate That Covers the Gills