Heron 192, 193 



Herring meal 139 



Heterotrophic ponds 31 



Hibernation (winter sleep) U, 181, 197, 202, 203 



Hibernation, emaciation during 6 



Hibernation, nutrition status during 183 



Hibernation ponds, stock strength of 183, 184 



Hibernation ponds, water reouirenient of „ 182, 183 



Hofer's fluid , 116 



Holes in ice, knocking of 183 



Hoppers (copepods) 11, 13, 32, 35 



Horse chestnut 137 



Horse flesh 133 



Horsetail (equisetum) 41, 42 



Humus layer 159 



Hungarian carp races 75 



Hydrocharis 42 



Hydrogen exponent ...*.. 51 



Hydrogen ions 31 



Hydrogen sulphide , 45, 58 



Hyphomycete-parasitic fish diseases 200 



Ice bird 193 



Ice coverage 49, 174 



Ice diver , 193 



Ice, holes in the 183 



Ice, knocking of holes in 183 



Ice-holding structure 182* 



Ichthyophthirius , 204* 



Idus melanotus 91 



litis (polecat) 193 



Immigration of small animal life , 35 



Impoverishment of nutrient food 30 



Impregnation of nets 173 



Inbreeding 78, 106 



Inbreeding injuries 106 



Increase 2, 3, 126 



Increase and fish stock density 40 



Increase, natural , 128, 145 



Increase , normal piece 128 



Increase of loss 128 



Increase, piece 90, 124, 128, 130, 167 



Increase, total 128, l44, 145 



Incubation 115, 116 



Incubation arrangements for trout 113* 



Incubators 109 



Individuality factors complex 4 



Infection diseases 200 



Initial feeding Ill, 121, 149 



Injury from cold 197 



Initial period of hatching 115 



Initial water supply 63 



Insect larvae 11, 13, 35 



Insects , water 192 



Intelligence factor 4 



Intensive management 70 



Intermediate consumers 28 



Intestinal canal, pH in the 16, 17 



Intestinal canal, reaction in the 16, 17 



Intestinal contents, seasonal composition of 12* 



Intestinal inflammation 144, 198, 199* 



Introduction of rainbow trout 105 



Investigation of fish diseases , 195 



243 



