158 FISH CULTURE 



must be increased and the fish kept in the brine 

 until they all exhibit great distress. When 

 some of the fish begin to turn over, the fresh 

 water must be turned on at once and the salt 

 water washed out as quickly as possible. Un- 

 der this heroic treatment some fish may die, but 

 this need cause no alarm, for they would have 

 died in any event. When a large amount of 

 fungus develops daily among eyed eggs, good 

 results may be obtained by taking the trays 

 carefully out of the troughs and sprinkling them 

 by means of a sprinkling-pot with a solution 

 of salt and water. 



Another word of caution is necessary con- 

 cerning the use of salt. Under no circum- 

 stances must what is commonly called "table 

 salt" be used. There is something in the proc- 

 ess of refining for table purposes that is 

 highly injurious to fish. Almost any form of 

 coarse salt can be employed, except pulverised 

 rock salt. 



Reference has been made to cleaning troughs 

 by means of a scap-net. The process is both 

 simple and interesting. First the water-supply 

 is turned off at the faucet, and the upper strip 



