Breeding char, difficulties in, 78-80 Breeding. (See Rearing.) Brown trout, suitable water for, 14 Bullrushes, 13 _Byssus_, 37-8 Caddis-worms, 61-3 in hatching trays, 38-9 Carp, suitable water for, 18 Char, 16, 78-80 Alpine, 78 difficulties in breeding, 78-80 hatching out of, 78-9 introduction of, to the south, 80 kinds of, 78 rearing, 79-80 suitable water for, 16 Windermere, 78 Charring wood, importance of, 33, 50 Chub, suitable water for, 18 Coarse fish, 88-92 ova of, 90-1 Colorado River trout, 77 Columbia River trout, 77 _Conchifera_, 12 _Corixae_, 10, 49, 63 Covers for rearing ponds, 31 Creatures, aquatic, serving as food for fish, 10-2, 61-6 Crowfoot, water, 13 Cure for fungus, 50 Cut-throat trout, 76-8 _Cyclops quadricornis_, 12, 48, 65-6 _Cypridae_, 65-6 Dace, 18, 89-90 suitable water for, 18 _Daphnia pulex_, 12, 48, 65 Dead alevins, removal of, 41 Dead ova, removal of, 37 Difference between beetles and _Corixae_, 11 Diseases of alevins, 40-1 ova, 37-9 _Dytiscus marginalis_, 11, 49, 58-60, 63 Earth in rearing boxes, 46, 93-6 doses of, in rearing pond, 54, 93-6 Effects of soft food on trout, 24 _Ephemeridae_, 12, 64-5 larvae of, 64-5 catching larvae of, 64 Feeding of the fry, 42-9 Feeding yearlings, 67 Food, importance of, in waters, 5, 7 Fresh-water shrimp, 10, 49, 65 snails, 10-2 Friends and enemies of the fish, 58-66 Fry, feeding of, 42-9 separating large from small, 45 turning out of rearing box, 51-2 Fungus, 38-9 cure for, 50 _Gammarus pulex_, 10, 49, 65 Gold-fish, suitable water for, 18 Grannom, introduction of, 12 Grass round rearing ponds, 32 Grayling, possible harm done by, to trout, 16 suitable water for, 17 Great water moss, 13 Hatchery, suitable spot for, 21-6 Hatching out char, 78-9 ova of coarse fish, 91-2 Hatching trays, arrangement of, 34 caddis-worms in, 38-9 construction of, 32 placing ova in, 34-6 removal of, 42-3 shrimps in, 36 Herons, 60-1 _Hydrophilus piceus_, 59-60 Important points in rearing young trout, 56-7 Inlet to rearing ponds, 29-30 King carp, suitable water for, 18 Kingfisher, 49, 53, 60 Lake Tahoe trout, 77 Lakewort, 13 Leaf screen to rearing ponds, 29 Lobelia, water, 13 May fly, introduction of, 12 Moss, great water, 13 Mussels, 12 _Nautonecta glauca_, 10, 64 Natural food, importance of, 24 natural food for fry, 48-9 Netting for rearing ponds, 31 Ova beds, artificial salmon, 85 Ova, care of, 36-9 dead, removal of, 37 hatching of, 39 of coarse fish, 90-1 of sea-trout, 87 placing in hatching trays, 34-6 Perch, 19, 90-1 suitable water for, 19 Pike, 18-9, 90-1 Planting weeds in ponds, 7 in streams, 8 Ponds for yearlings, 70-1