Fish physiology

A. Digestive System

IX. Metabolism
Interest in aquarium fishes and sportfishing supports multimillion-dollar industries throughout the world. In this way, fish can stay at the current water depth, or ascend or descend without having to waste energy in swimming. Hearing is an important sensory system for most species of fish. The fish's fins function like an airplane's flaps. Boulder Area Sustainability Information Network. Postovulatory follicles are structures formed after oocyte release; they do not have endocrine function, present a wide irregular lumen, and are rapidly reabsorbed in a process involving the apoptosis of follicular cells. The gills are composed of comb-like filaments, the gill lamellae , which help increase their surface area for oxygen exchange.

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Internal anatomy of a bony fish