xiv Contents 



Stocking for Improvement of a Population 110 



Stocking to Improve a Food Chain 112 



Failures in Stocking Fish 113 



Predation 115 



The Role of Predation in Fish Management 115 



Competition 118 



Competition for Food 118 



Competition for Space 119 



Competition for Specific Habitats 123 



Starvation 123 



Inter- and Intraspecific Competition 123 



Reproduction, Competition, and Predation 124 



Balance 125 



Literature 127 



Chapter 6. Theories and Techniques of Management 130 



Fish Sampling 130 



Reasons for Sampling Fish Populations 131 



Sampling Methods 132 



Gill Nets 133 



Trammel Nets 133 



Seines 133 



Hoop Nets, Wing Nets, and Trap Nets 134 



Minnow Seine Sampling 135 



Minnow Seine Method of Pond Analysis 136 



Spot Poisoning 137 



Boat Shocking 137 



Angling 139 



Management Techniques 140 



Complete Fish Population Removal 140 



Population Removal by Draining 140 



Population Removal by Rotenone Treatment 142 



Selective Poisoning 147 



DDT and Other Insecticides 147 



Toxaphene 148 



Sodium Cyanide 149 



Sodium Sulfite 149 



Fish Population Adjustment 150 



Use of Nets and Seines 150 



Partial Poisoning 150 



Timing in Partial Poisoning 151 



Shoreline vs. Sectional Treatment 152 



