REARING THE YOUNG FRY. 207 



consequence is inevitable. The trout must die. This 

 cause of death is trying, because you can see the 

 trouble and know what is coming, but cannot help it. 

 If you have colder water, remove the fish to it without 

 delay, and take the first hours of the morning in which 

 to do it, when the water is coolest j use ice in convey- 

 ing them. If the heat is only exceptional, you can do 

 some good by the use of ice placed in the inlet. I 

 have saved some in that way ; indeed, as long as the 

 ice lasts you are safe, but it wastes very rapidly in run- 

 ning water, and therefore is often unavailable. The 

 dangerous point of temperature lies somewhere be- 

 tween 70 and 85° Fahrenheit. I have known water 

 to be fatal at 72° or 73°, and I have known trout to 

 live in good vigorous water at 78 , but danger is near 

 when the mercury begins to be above 70 . 



22. Suffocation. This is simply the result of want 

 of air, from the water having been breathed over too 

 much. The cause and remedy are obvious. I will 

 only say that the colder the water the slower trout 

 breathe. 



In case of suffocation, the fish should not be given 

 up because it appears to be dead, for suffocated trout 

 are often restored, even after life seems to be entirely 

 extinct. The way to do this is to aerate the water in 

 which they are contained as vigorously as possible. 

 The effect is often very startling, as well as gratifying, 

 in bringing to life fish that appeared dead. 



In concluding this chapter on the diseases of young 

 fry, I would recommend to the trout-breeder to ex- 

 amine his trout carefully every day, and to be always 



