Nutrition, amount of «.... « 5 



Nutrition assimilation of trout » 15 



Nutrition competitors I5, 34, 192 



Nutrition, emergency 11, 12 



Nutrition, energy content of the 19 



Nutrition evaluation and stock strength 12, 12, 38, 39, 39» 



Nutrition, excessive 6 



Nutrition, extent of 12 



Nutrition, first take up by trout brood • , 121 



Nutrition, forms of , 10 



Nutrition, general condition of *..... 26 



Nutrition intake by cyprinides 15 



Nutrition, main 11 



Nutrition, mineral content of the 25 



Nutrition morsels , size of 26 



Nutrition of pond fishes by artificial feeding 15 



Nutrition of pond fishes by natural feeding 10 



Nutrition of the pond fishes 10 



Nutrition of the ruff (Acerina cemua) 12 



Nutrition of the small fauna 34 



Nutrition of trout 13 



Nutrition of white-fishes (Coregonus) , 15 



Nutrition, opportunity 11, 15 



Nutrition quotient 132 



Nutrition, secondary 12 



Nutrition status during hibernation ....••.....*• 183 



Nutrition taJce up and temperature 4 



Nutrition, taking up of 15 



Nutrition, vitelline-sac 4, 6 



Nutrition, water content of the * 25 



Nutritive ani^^als, food value of 10 



"Geo" motor reed-cutter 155 



Oil manufacture, wastes from 138 



Oiled fabric aprons 108 



Oligotrophia 30, 32, A8, 59 



One-day flies, see Cloion, Ephemera, Ephemerids 11, 12, 13, 20, 33, 3A, 35, 36 



One-year carps, autumn fishing out of 85 



One-year carps, spring fishing out of 85 



Opening up of foodstuffs 134, 163 



Opportunity nutrition 10, 11, 15 



Organic fertilization 171 



Organic fertilization of trout ponds 172 



Origin of disease 193, 194 



Original producers 28 



Orthocladius ., 13, 33, 34, 35 



Ostracoda, see Bivalve Crustacea 11, 12, 13, 32 



Outflow factor 47, 110 



Ovarian pocket, see peritoneal duplication 102, 108 



Over-feeding 198 



Overflow 6/;, 65, 65* 



Overflow apparatus for counting fish eggs 120» 



Over-nutrition 6 



Over-stocking 130 



Oxygen apparatus • 186» 



Oxygen barrels , s ource of supply for 186 



Oxygen, consumption of • 49, 163 



Oxygen content 49, 50, 117, 163, 172, 182 



Oxygen content, critical 49, 50 



Oxygen, determination of ...» 50 



Oxygen enrichment • 152 



Oxygen generator, Kralena •••• 186 



Oxygen production by the plants •« 43 



248 



