Fishes, as the largest group of living vertebrates, offer almost unlimited opportunities for the study of evolutionary adaptations to environmental and biotic selection pressures. The book covers basic fish anatomy, physiology and phylogeny, but the major theme of the book is evolution. For example, What has been the effect of evolutionary pressures on the form and function of fishes? Pitched at the undergraduate market, this book will serve as a core text for ichthyology courses offered by wildlife and fishery departments.