CDcygen requirement o •• 4- 



Oxygen, saturation value of 4.9 



Paints (CK), scrurce of supply for 110 



Paints, water-resistant 110 



Parasites U, 80, 81, BU, 151, 162, 163, IhU, 183 



Paratendipes » 33 



Para typical factors • o 



Parent fishes, feeding of 77, 98, 99, 100 



Parent fishes, feeding of, and fish stock density 130 



Parent trout, see spawn trout 98, 99, 100, 101, 102, 105 



Pea mcllusca (Fisidium) ...* • 33 



Peasant carps • 76 



Peat hole 191 



Pepsin 16, 17 



Perch, nutrition 12 



Perch-pike and its culture M, 92 



Perforated sheet zinc 68» 



Perforation of the gill cover 196, 197 



Peritoneal duplication, see Ovarian pocket •.... 102, 108 



pH alteration 12., 51, 52 



pH and acid-combining power .• 5<4 



pH application 52 



pH determination 53 



pH in the intestinal canal 16, 17 



pH value 56, 162, 163, 16^, 165, 166, 194, 196, 197, 200 



pH value, normal 55 



Pharyngeal teeth 15 



Phenol 58 



Phosphate fertilization of trout ponds 169 



Phosphate fertilization, secondary effects of 169 



Phosphate , ■* Rhenania" 169 



Phosphoric acid, action of 169 



Phosphoric acid fertilization 169 



Phoxinus laevis (minnow) 13, \L, 95 



Phragmites 42, 153 



Phryganea 33 , 34 



Physa 32 



Piece increase 90, 124, 128, 129, 130, 167 



Piece increase, normal 128 



Piece loss, normal 128 



Piece losses, see loss percentage 122, 123, 12^, 125, 128 



Piece weight of set- in fishes 128, 129 



Pigs in the pond 172 



Pike and pike culture K, 92, 93, 106, 112, 191 



Pike brood, shipment of 92 



Pipes, water carrying capacity of 67, 68 



Piscicola, see fish leeches 35, 183, 209 



Pisidium 33 



Plankton 29 



Plankton-anijnal eaters 11 



Plankton-animal nutrition, natural 143, 14^ 



Plankton animals (zooplankton) 34, 35, 36, 37 



Plankton animals , mass development of 37 



Plankton animals , maxima of 36 



Plankton, dwarf LU 



Plankton eaters 11, 34 



Plankton fauna 34, 35, 36, 37 



Plankton fauna and environment 34 



Plankton-plant eaters 34 



Plankton plants , ij^ 



Plankton, value of 11 



Planorbis 32 



249 



