viii FISH HATCHERY MANAGEMEN 1 



3: Broodstock, Spawning, and Egg Handling 



Broodstock Management 131 



Aquisition of Broodstock 1 32 



Care and Feeding of Broodfish 1 32 



Forage Fish 140 



White Sucker 140 



Fathead Minnow 141 



Goldfish 142 



Golden Shiner 143 



Tilapia 144 



Improvement of Broodstocks 1 44 



Selective Breeding 144 



Hybridization and Crossbreeding 148 



Spawning 149 



Natural Spawning Method 149 



Salmonid Fishes 750 



Warmwater Fishes 750 



Artificial Spawning Method 756" 



Factors Affecting Fertilization 76^7 



Gamete Storage 168 



Anesthetics 76^5 



Artificial Control of Spawning Time 7 70 



Photoperiod 7 70 



Hormone Injection 7 71 



Egg Incubation and Handling 173 



Egg Development 7 74 



Sensitive Stage 7 75 



Eyed Stage 7 75 



Enumeration and Sorting of Eggs 7 75 



Egg Disinfection 1 89 



Incubation Period 189 



Factors Affecting Egg Development 1 90 



Light 190 



Temperature 757 



Oxygen 752 



Transportation of Eggs 1 93 



Types of Incubators 1 93 



Hatching Trays 1 93 



Clark- Williamson Trough 1 94 



Catfish Troughs 755 



Hatching Baskets 755 



Hatching Jars 755 



