76 THE GOLDFISH AND ITS CULTURE. 



the time. In winter allow them to enjoy the full light of the sun, but 

 towards spring and during the summer shelter the tank from the 

 direct rays. 



If the goldfish are kept in water that contains no acquatic plants, 

 it will have to be changed frequently as the oxygen in it can not, in 

 most cases, be replaced from the atmosphere as rapidly as it is 

 consumed by the fish. 



