This agriculture extension service publication from Pennsylvania State University is a handbook for the water body manager. The bulk of the contents deals with aquatic plant control. The different types of aquatic plants, their reproduction and growth, and their role in the ecology of the water body are introduced in this main section. Also, the various management and control practices along with some safety precautions for using herbicides are discussed. In the second section the problem of fish management and control, including legal restrictions, is examined. (MR)