4 FISH CULTURE 



Eiver, stream or lake water, which during the 

 spawning season will not fall below 55 degrees, 

 preferably below 60 degrees, and only becomes 

 muddy after exceptionally heavy storms, and 

 then for a short time only, is necessary. Dur- 

 ing the breeding season, higher temperatures 

 than those named, and water perpetually clean, 

 are very much to be desired. At 50 degrees 

 the fish will not spawn; and at 45 degrees both 

 eggs and fry will die. 



A great volume of water is unnecessary, al- 

 though desirable, since it insures one against 

 any fear of a shortage in drought. Under 

 ordinary circumstances 500 gallons of water a 

 minute will be ample to operate a very large 

 plant, but, whatever the volume, it is of the 

 utmost importance that it be under complete 

 control. A fish-culturist who cannot regulate 

 his water-supply is likely to lose two-thirds of 

 his chances for successful work. 



Water that becomes roily through storms is 

 not objectionable, provided the roiling is not 

 continued too long or is of too frequent occur- 

 rence, especially while the nests contain eggs. 

 For a short time muddy water has no percept- 



