the sun's rays will enter the pond. If the water becomes foul, a gauze-co\ered basket is put in 

 the concave area at one end of the pond and the water is withdrawn with a rubber syphon without 

 any distuibance of the young, fresh water being then supplied. 



Drawing Uuwn .x Co.n'ceete Re.mung Pond 



The ryukin and wakin. being hardier than the ranchu, may be reared in mud ponds, to 

 which the young are transferred 3 or 4 days after they begin to feed. For the successful culti- 

 vation of the ryukin, ample pond area is required for the fish and for the culti\'ation of the crustacean 



71 



