Described in this unit are three activities related to classification and fish identification. In the first activity students design and use a dichotomous key to common classroom items, while Activity B involves the construction of a key to Lake Erie fish families. During Activity C, each student writes a story and draws a humorous picture of a fish based on its common name. Both a student workbook and teacher's guide are provided. The latter includes objectives, teaching suggestions, line drawings of Lake Erie fishes and an answer key. (WB)