How do fishes do gas exchange?
Fishes “breath” through gills. Gills, or branchiae, are highly vascularized organs specialized in gas exchange under water and present in aquatic animals (marine annelids, crustaceans, fishes and tadpoles). Gills are a respiratory organ (analogous, for example, to lungs) containing very thin lamellae with many apparent blood vessels in direct contact with water. In osteichthyes the gills are covered by a bony flap that protects them called operculum. In chondrichthyes there are no opercula.
