Book excerpt: Advances in Physiological Sciences, Volume 31: Sensory Physiology of Aquatic Lower Vertebrates covers the proceedings of the symposia of the 28th International Congress of Physiology. The book presents 17 papers that detail advance findings in the sensory physiology of aquatic lower vertebrates. The coverage of the text includes electroreceptors in Indian catfish teleosts; electroreceptive microampulla in the African mudfish Clarias lazera; and species specificity of electric organ discharges in a sympatric group of gymnotoid fish from Manaus. The book also presents comparative studies, such as the sex differences in the electric organ discharge of Eigenmannia virescens and the effect of gonadal maturation; and behavioral studies, such as social behavior in mormyrid fish. The book will be of great interest to marine biologists, ethologists, and zoologists.