426 
bulletin of the bureau of fisheries. 
from pond to pond where these ponds communicated with each other. Figure 76 shows 
the arrangement of the ponds, the general distribution of the water supply, the species 
of the fish, and the incidence of the disease. The following observations on this diagram 
were made at the time : 
The water supply of ponds i to 1 1 is from a natural spring on the hillside. The 
water supply of ponds 2 to 10 and 12 to 19 is from Craig Brook, the water of each pond for 
the most part flowing into the pond immediately below it, pond ii flowing into pond 12. 
As the diagram shows, pond ii contained healthy fish. These up to the time of this 
