280 Index 



Ricker, Wm., 200, 203 



Ridge Lake (III), 67, 75, 93, 95, 204, 



244 

 Rotenone, 



dosage for killing fish, 143 



first pond poisoning attempt with, 142 



method of application of, 143 



optimum temperature for treatment, 

 145 



properties of, 142 



removal of desirable fish before, 145 



residual toxicity, 147 



toxicity to fish, 143 



toxicity loss with kill of fish, 147 



used for collecting fish, 142 

 Rough fish, 



control, in reservoirs, 11-12 

 Russell, E. S., 182 



Saila, S. B., 106 

 Salmo (salmon), 



several spawning migrations, 237 

 Salmon, spring or coho, 



repellent action of mammal skins, 224 

 Sampling, fish, 131, 132 



angling as a method of, 139 



boat shocking, 138 



minnow seine, 135-136 



reasons for, 131 



regular annual uses for, 137 



spot poisoning, 137 



with gill nets, 133 



with hoopnets, wing nets, and trap 

 nets, 134 



with trammel nets, 133 

 Saran screen, M.S.-904, 140 

 Saturation point, 59 

 Scavengers, 201 



removal of carrion by, 201 

 Schaeperclaus, W., 200 

 Schloemer, C. L., 231 

 Schooling, of fishes, 230 

 Scuba, 214 

 Selection, 



intentional, of hatchery fish, 102 



through fishing, for least wary, 103 



unintentional, of hatchery fish, 102 

 Selective breeding, 101 

 Selective poisons, 



for fish, 147 

 Senachwine, Lake (111.), 124 

 Senility, in fish, 200 

 Sex characteristics, external, 97 

 Sex ratios, 96 

 Sewage, human, 



nitrogen content of, 44 



phosphorus content of, 44 



Shad, gizzard, 



localized kills of, 56 



reduction of, in water supply reservoirs, 



12 

 standing crop of, 64 

 Shad, threadfin, 



stocked to improve food chain, 11, 112 

 Shapovalov, Leo, 257 

 Shetter, D. S., Whalls, M. J., and Cor- 



bett, O. M., 208 

 Shiner, blacktail, 



sound production of, 219 

 Shiner, golden, 



survived winterkill at Gale Lake, 53 

 Shiner, red, 



sound production of, 219 

 Shiner, satinfin, 



sound production of, 219 

 Size limit, 



on short-lived species, 208 



removal of, 209 

 Smelt, 



stocked to improve food for trout, 113 

 Snieszko, S. F., 200 

 Sodium cyanide, 149 



dangers of using, 149 



toxicity to fish, 149 

 Sodium sulfite, 



as a fish salvage, 149 

 Solitary fishes, 229 

 Solunar tables theory, 242 

 Sound location, 218 

 Sound production, 



of blacktail shiner, 219 



of drum, 219 



of red shiner, 219 



of satinfin shiner, 219 

 Spawning, 97 



length of season, 97 



related to season and water temper- 

 ature, 98 

 Spawning, natural, 



deep lake studies, 8 



success, as compared to hatcheries, 8 

 Spawn production and number of spawn- 



ers, 94 

 Standing crop, 



chemical basis for size of, 63 



definition of, 60 



effect of hard water on, 70 



effect of kinds of fishes on, 63 



factors affecting poundage of fish, 62 



fertilization increases, 63 



ranges of, 63 



relative abundance of species in, 60 



yield as related to, 185 

 Starrett, W. C, 20 



