de, importance of, 19

Alevins, 39-41
diseases of, 40-1

Alpine char, 78

American brook trout, 15
rearing of, 75-6
spawning of, 76

Aquatic creatures, serving as food for fish, 10-2, 62-6

Aquatic plants suitable for deep water, 13
suitable for margins, 13

Aquatic vegetation, importance of, 7
development of, 9

Arrangement of rearing boxes, 34

Artificial spawning of salmon, 83-4

_Asellus aquaticus_, 65

Black spotted trout of the Rocky Mountains, 76-8

Blue swelling, 41

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,