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

 the concave area at one end of the pond and the water is withdrawn with a rubber syphon without 

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



Drawing Down a Concrete Rearing Pond 



The rvukin 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 cultivation of the crustacean 



71 



