This course provides an introduction to the broad field of fish biology. It develops important background for those interested in pursuing careers in fisheries biology, aquaculture, water quality assessment, ecology or vertebrate physiology. We review a number of the traditional concerns of ichthyology including fish taxonomy, anatomy, physiology and distribution, ecology and behavior. Special attention is given to field collection methods involving seining and electroshocking, and to identification of Ohio stream and lake fish species. Prerequisite: BIO 123.