Feeding of parent fishes and fish stock density ^ 130 



Feeding of trout 147 



Feeding of trout f ingerlings • 150* 



Feeding, see carp feeding, etc 15, 144, 147 



Femel inanagement (unsorted management) 76 



Fterments (enzymes ) 16, 17 



Fertilization experiments on ponds, local 170 



Fertilization experiments on the pond 167, 168, 169 



Fertilization, green 158, 172, 200 



Fertilization, nitrogen 170 



Fertilization of eggs 106, 1C7 



Fertilization of ponds, nitrogen-free 171 



Fertilization, organic 171 



Fertilization, phosphoric acid 168 



Fertilization, testing of in eggs 116 



Fertilization with mineral fertilizers 167 



Fertilization with phosphates, secondary effects of 169 



Fertilization with potash 169, 170 



Fertilizer action 167 



Fertilizer application 168 



Fertilizer increase 128 



Fertilizer investigations at Sachsenhausen 167 



Fertilizer investigations at Wielenbach ., 167 



Fertilizers , water plants as 171 



Fever mosquitoes 36 



Filamentous algae 157 



Filler substances 24 



Filter 64, 65*, 11>, 114 



Filter, gravel 65* 



Fin defects 197 



Fingerlings , June 122 



Fingerlings, September 122, 123 



Fish barrels 185* 



Fish body, maintenance of the 2 



Fish boxes 180 



Fish breeding, artificial 98 



Fish breeding helpers 69 



Fish breeding masters 69 



Fish brood, counting of 173 



Fish cans 184 



Fish disease, transmission to human beings 213 



Fish disease control, in general 212, 213 



Fish diseases 193 



Fish diseases and mortality 193 



Fish diseases , capability of spreading 194 



Fish diseases , classification I96 



Fish diseases , hyphomycete-parasitic 200 



Fish diseases, investigation of 195 



Fish diseases , mold-parasitic 200 



Fish ditch 64, 84«, 151, 176 



Fish eagle 193 



Fish eggs, counting of 119 



Fish eggs , unpacking of 118 



Fish enemies 192 



Fish feeding 131 



Jlsh flesh, flavor of 97, 98, 137, 138 



Fish heron 192, 193 



Fish holder units and air nozzles, source of supply 180 



Fish leeches 183, 209 



Fish mold 200 



Fish mortality and fish diseases 193 



Fish otter <> 193 



239 



