434 
BULLETIN OF THE BUREAU OP FISHERIES. 
Table IV. — Incidence of Thyroid Carcinoma in Dirt Ponds, Craig Brook, 1909-1912. 
[Where there are two entries for Augrust, 1909. under total number of fish, the number before and after removal of tumored 
fish is indicated.] 
Pond 
No. 
8 
8 
7-8 
9 
Lot No. 
1950T 
1995 
2017 
2027 and 2028B 
2133 
2133 
2133 
1944 
1950 
1934A 
I939A 
1937 
1939 
1947 
1947 A 
Date. 
Aug., 1909 
July, 1910 
July, 1911 
Aug., 1909 
July, 1910 
July, 1911 
Aug., 1909 
July, 1910 
July, i9ir 
Aug., 1912 
Aug., 1909 
July, 1910 
July, 1911 
July, 1910 
July, 1911 
July, 1910 
July, 1911 
Aug., 1912 
Aug., 1909 
July', 1910 
July, 1911 
Aug., 1912 
Aug., 1909 
July, 1910 
July, 1911 
Aug. 1909 
July, 1910 
July. i9ir 
Aug., 1912 
Aug., 1909 
July, 1910 
July, 1911 
Aug., 1912 
Aug., 1909 
July, 1910 
July, 1911 
Aug., 1913 
Aug., 1909 
July, 1910 
July, 1911 
Aug., 1912 
Aug., 1909 
July, 1910 
July, 1911 
Aug., 1912 
Aug.. 1909 
July, 1910 
July, igir 
Aug., 1912 
Age. 
Species. 
Total 
number 
fish. 
Visibly 
affected. 
Visible 
tumors. 
Loss. 
Years. 
119 
39 
Per cent. 
Per cent. 
Per cent. 
90. 0 
50. 0 
(?) 
56. 0 
67. 0 
85-7 
/ 146 
\ 138 
77 
27 
729 
542 
415 
13-0 
37-4 
44.0 
65. • 
23- 5 
47.0 
469 
230 
S3 
50.9 
76.9 
59 
70 
46 
31 
97 
73 
66 
26. 0 
34- J 
70. 0 
24. y 
5 
32 
/ 892 
\ 673 
Si.o 
(?) 
13-0 
37- 2 
557 
58? 
65 
28 
(?) 
57-0 
71.0 
8 
1 230 
(?) 
1 223 
64. 0 
So 
25. 0 
58 
/ 183 
\ 167 
76 
71 
27-5 
(?) 
8.7 
a 
31- 5 
16. 9 
19. 0 
(?) 
15- 7 
54-0 
6.6 
70. 0 
5-0 
iS-o 
/ 133 
1 113 
59 
34 
17 
113 
6. 7 
8.8 
23- S 
I- 7 
48. 0 
42.4 
SO. 0 
12. 0 
Q 
87. 0 
• P 
27. 7 
18 
16. 7 
IS- 3 
13 
301 
188 
do 
.-0 
37.0 
32.0 
20. 0 
127 
JOI 
10. 0 
6. 0 
.8 
X. 0 
a Female, humpback; male, blueback. 
Female, brook trout; male, landlocked salmon. 
