This elementary school teaching unit was developed as a part of a series of units that deal with Lake Erie. This unit was developed to enable children to: (1) examine a moving fish; (2) conduct experiments with a live fish; (3) understand the swimming habits of fish; (4) learn how fish breathe; (5) recognize different methods of fish protection and habitats; and (6) compare a fish and a whale. The document contains a unit outline, descriptions of activities and experiments, background information for the teacher, reproducible worksheets, a list of vocabulary words, overhead transparency masters, suggestions on how children might create their own unit booklets, and library references. The last eight pages are designed to be removed, laminated, and connected to form posters that can be written on with watercolor markers and crayons. (TW)