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 : 



Empty. 



Empty. 



Empty. 



Hybrid salmon i year old, 

 lot 1995; 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; 92 per cent vis- 

 ible tumors. 



Empty. 



Empty. 



landlocked salmon, 3 years 

 old, lot 1944; no visible 

 evidence of disease. 



lyandlocked salmon, 3 years 

 old, lot 1950; 24 per cent p •" 

 visible tumors. 



Brook trout 2 years old; lot 

 1934 A; no visible evi- 

 dence of disease. 



* Brook trout 2 years old ; lot 

 I 1939A. 3 per cent visible 



J I 



T 



I A it Brook trout 2 



years old, lot 1937; 

 visible tumors. 



Brook trout 2 years old. lot 1939; iS 

 per cent visible tumors. 



Humpback salmon i year old, lot 1986; 84 

 per cent visible tumors. 



Scotch sea trout 2 years old, lot I94T; no visible 

 evidence of disease. 



Scotch sea trout 2 years old. lot i94:A; no vis- 

 ible evidence of disease. 



Empty. 



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



The water supply of ponds i to 1 1 is from a natural spring on the hillside. The 

 water supply of ponds 2 to loand 12 to 19 is from Craig Brook, the water of each pond for 

 the most part flowing into the pond immediately below it, pond 1 1 flowing into pond 12. 

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



