The Physiology of Fishes, Volume II: Behavior focuses on the physiology of fishes, as well as nervous and visual systems, sense organs, fish behavior, and pigment of fishes. The book first offers information on the nervous system, including the telencephalon, mesencephalon, metencephalon, medulla oblongata and spinal cord, autonomic nervous system, and functional development of the nervous system. The manuscript then elaborates on the sense organs, acoustico-lateralis system, and olfactory and gustatory senses of fishes. Discussions focus on component parts of the visual system, photoreceptive functions, lateral line, and the labyrinth. The manuscript takes a look at the ethological analysis of fish behavior and reproductive and parental behavior. Topics include coordinating and releasing mechanisms, ecological relationships, endocrine mechanisms, and motor processes. The text also touches on electric organs, luminous organs of fishes, and pigment of fishes. The publication is a valuable reference for readers interested in the physiology of fishes.