viii Preface 



predation, the book comes to grips with the theory and techniques of 

 management per se. Now, the complex problems of fishing mortality and 

 natural mortality are handled before concluding with chapters on sensory 

 perception and behavior in sport fishing and the commercial aspects of 

 this most popular of all outdoor sports. 



No attempt has been made to avoid technical matter, although technical 

 terminology has been reduced to a minimum and the mathematical ap- 

 proach to population dynamics has been relegated to a list of papers, 

 many of which will be available in the nearest university library. For the 

 convenience of the student and individual pond owner who will be using 

 the book, important terms and concepts are defined when they are first 

 presented. No scientific names of fishes appear in the nine chapters of this 

 book; however, the scientific names as well as the common names of all 

 fishes mentioned may be found in the Appendix. A few scientific names 

 other than those of fishes appear in the text, most of which are the names 

 of aquatic plants as given by Fassett.* 



Any author who completes a book is indebted to many people. In this 

 respect, I have been very fortunate in receiving the counsel of all of the 

 members of the Aquatic Biology Section of the Illinois Natural History 

 Survey. I am particularly indebted to Drs. William C. Starrett, R. Weldon 

 Larimore, and Donald F. Hansen of our Section editorial committee for 

 giving of their own time to read and criticize this manuscript. 



Dr. Harlow B. Mills, Chief of the Illinois Natural History Survey, has 

 contributed greatly through his encouragement, his suggestions for im- 

 proving certain areas in each of the nine chapters, and through his special 

 ability to recognize and point out the author's bias regarding several con- 

 troversial subjects. 



Mr. Royal B. McClelland, Executive Secretary of the Illinois Federation 

 of Sportsmen's Clubs and Editor of Illinois Wildlife magazine, has read 

 the manuscript through the eyes of a fisherman and lake owner, and has 

 suggested changes to make the book more understandable and readable. 



Much of the original planning for subject matter included in Chapter 6 

 came from discussions with Mr. Sam A. Parr, Executive Assistant for the 

 Illinois Department of Conservation, and Mr. W. W. Fleming, Director 

 of Fish and Game, Indiana Department of Conservation. This chapter on 

 theories and techniques of management was later presented to Mr. Wil- 

 liam J. Harth, Superintendent of Fisheries, Mr. Al Lopinot, Chief Fishery 

 Biologist of the Illinois Department of Conservation and to other profes- 

 sional fishery biologists with the Department for general discussion at the 

 1961 meeting of Illinois aquatic and fishery biologists. I am grateful for 

 the suggestions offered at this meeting. 



* Fassett, N. C, "A Manual of Aquatic Plants," with revised Appendix by A. C. 

 Ogden, University of Wisconsin Press, Madison, Wisconsin ( 1957). 



