87 



The salmon trout died twelve hours before any of the 

 rest, and all of ihe others died i within four hours of each 

 other. All of the full spawning fish want clear, cold 

 water. Whitefish will not live in water above 72° We 

 have seen these taken in a seine, and when they got into 

 shallow water where the temperature was 74° ten rods 

 from the shore, the fish began to "turn up," and were all 

 dead when they were hauled up on the shore. 



Diseases and Enemies. — The diseases to which adult 

 trout are subject are numerous and often fatal. Some 

 times a trout will be observed to have a white fungus 

 growing upon it in spots. This will spread over the fish 

 until it dies. Sometimes fish will turn to a black color. 

 This always seems to be an indication of blindness, as we 

 have never observed this peculiar color unless the fish 

 was partially or totally blind. The fungus which grows 

 upon the fish is probably not a disease, but is caused by, 

 or is the indication of a disease. Nothing is known 

 about remedies. If only a few trout ai'e affected, take 

 them out as they will be sure to die. If the trout begin 

 to die in numbers, change them to another pond, if possi- 

 ble, or give them more water. This is all we can do for 

 thendi. The dead trout should be taken out of the pond as 

 fast as they are discovered. They will rise to the surface 

 only in very rare cases, but generally sink to the bottom, 

 and if there is much moss in the pond they are lest to 

 sight, and decaying on the bottom will foul the pond. 

 If there is much sickness among the trout, we generally 

 consider it A sign of insuflicient water. 



There are but few enemies of trout in artificial ponds. 

 If the ponds are near the house, and people constantly 

 about them, there will be no trouble with the birds 

 which usually prey upon fish — sach as the kingfisher, 

 fish-hawk and crane. Even if the ponds are some dis- 



