426 



BULLETIN OF THE BUREAU OK 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: 



Empty. 



Empty. 



Empty. 



Hybrid salmon i year old, 

 lot 199s; 5 per cent visi- 

 ble tumors. 



Hybrid salmon i year old. 

 lot 2017; no visible evi- 

 dence of disease. 



Hybrid salmon i year old. 

 lot 1994; 93 per cent vis- 

 ible tumors. 



Empty. 



Empty. 



I,andlocked salmon, 2 years 

 old, lot 1944: no visible 

 evidence of disease. 



I^end locked salmon, s years 

 old, lot 1950; 24 per cent r — 

 visible tumors. 



Brook trout 2 years old; lot 

 1934A ; no visible evi- 

 dence of disease. 



' Brook trout a years old; lot 

 I igjgA, 3 per cent visible 



Brook trout 2 years old. lot 1937; 

 per cent visible tumors. 



Brook trout 2 years old, lot 1939*. >S 

 per cent visible tumors. 



Humpback salmon i year old, lot 1986; 84 

 per cent visible tumors. 



Scotch sea trout 2 years old, lot 1947; no visible 

 evidence of disease. 



Scotch sea trout 2 years old. lot 1947A; no vis- 

 ible evidence of disease. 



KjG. 76. — Plan of south ponds at Craig Brook station. 



The water supply of ponds i to ii 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 11 flowing into pond 12. 

 As the diagram shows, pond 11 contained healthy fish. These up to the time of this 



