HATCHING TEOUT 157 



the faucet can fall on it. This will make a very 

 weak solution which will run through every 

 part of the trough. If the disease be more pro- 

 nounced, and a more effective dose be neces- 

 sary, the salt can be scattered over the bottom 

 of the trough and then thoroughly dissolved by 

 the hand, leaving the water running during the 

 saturation. As the fish grow older it is some- 

 times well to put salt in the water, even when 

 there is no pronounced indication of disease. 

 There are two very good methods of admin- 

 istering a salt bath to advanced fry and finger- 

 lings while yet in the hatching-house. The 

 most successful is to cut off the water-supply 

 and distribute salt as evenly as possible 

 throughout the trough ; then by a gentle motion 

 of the hand back and forth through the gravel, 

 dissolve it. The other method is first to dis- 

 solve the salt in a pailful of water, and then, 

 after turning off the water-supply as in the 

 other method, distribute the brine as evenly as 

 possible over the trough by means of a small 

 sprinkling-can or watering-pot. Should it hap- 

 pen that the disease is widespread, and heroic 

 measures are necessary, the amount of salt 



