Preface ix 



Many people furnished invaluable cooperation as lake and pond owners 

 willing to allow the collection of fish and fishing in their waters. These 

 cooperators would number more than a hundred. Of these, I have space 

 to mention a few: Mr. WilHam Utterback and Mr. David Malcomson, 

 each of whom owns a number of gravel-pit ponds and who not only 

 allowed us to use these ponds for research but gave of their own time to 

 assist in research activities; Mr. Faye H. Root, Assistant Professor of Camp 

 and Park Management at the University of Illinois Robert Allerton Estate 

 near Monticello, who has arranged for our use of 4-H Club ponds and has 

 given cooperation in many ways; and Mr. Max McGraw, owner of the Fin 

 'n Feather Club, who has built special ponds for research and has fur- 

 nished creel and management data from ponds and lakes on the club 

 property for our use. 



I especially wish to acknowledge the valuable assistance of Miss Mary 

 Frances Martin, Technical Assistant and Secretary for the Section of 

 Aquatic Biology, who was always willing to help in various phases of this 

 work, and of others who have typed material, a page at a time. My wife, 

 Mary Ellyn, read the manuscript at each stage of progress for spelling, 

 punctuation, and meaning. 



I do want to express my appreciation to Dr. Peter Gray and Messrs. 

 Ross, Chastain, and Hart of the Reinhold editorial staff for their constant 

 encouragement and assistance in improving my manuscript. 



George W. Bennett 

 XJrhana, Illinois 

 April, 1962 



