D. Characteristics and uses of the different foods 137 



1. Vegetable foods , 137 



Lupines - soya bean extract groats - other legumes - horse 

 chestnut - com - rye, barley and other grain seeds - flours, 

 food meals, brans, brewer's grains, slops - residues of oil 

 manufacture - potatoes - waste bakery products - beech wood and 

 poplar wood sawdust - dry yeast. 



2. Animal Foods 139 



Fresh sea fishes - dried fishes - fish meals - fresh freshwater 

 fishes - fresh warmblood meat - flesh food flour - food lime - 

 spleen, liver, brain, blood - dried spleen - blood flour - blood 

 yeast - milk curd - poultrj'- eggs - shrimps - Wollhand crab groata - 

 mussels and snails - frogs - June bugs - natural small animal 

 nutrition. 



E. Food dispensing 144 



1. Carp and tench feeding 144 



2. Trout feeding 147 



Chapter VIII. Care of ponds 151 



A. Objects and methods of pond care 151 



B. Maintenance of the pond arrangements 151 



C . Aeration of the water for oxygen enrichment , 152 



D. Removal of undesirable and excessive plant growth in the pond 152 



E. Drainage and cultivation of the pond bottom 158 



F. Liming 162 



G. Fertilization with commercial phosphates, potash and 



nitrogenous fertilizers , 167 



H. Organic fertilization 171 



Chapter EC. Fishing out, sorting and storage 173 



Chapter X. Hibernation 181 



Chapter XI. Fish transportation 184 



Chapter XII. Pond fishery bookkeeping 188 



Chapter XIII, Small pond management 190 



Chapter XIV. Enemies of the pond-f i shes 192 



Chapter XV. Diseases of the pond-fishes and their brood 193 



A. Symptoms, distribution and importance of diseases. Direction for 



forwarding diseased fish to laboratories ,,, 193 



B, Classification of pond-f:sli diseases 196 



C» Non-parasitio diseases , I96 



Illness from acid (sour) water - gill cover perforation - rachitic 

 shortening and malformations of gill covers and bones - hereditary 

 conditioned faulty skeletal developments - malformations in trout brood - 

 vitelline-sac dropsy - injuries frcm cold - bursting of trout eggs - gas 

 bubble disease - accumulation of egg shells in the abdominal cavity - 

 inflammation of the stomach and intestine - lipoid (fatty) degeneration 

 of the liver - pocks disease, 



P-7*09 



