198 
PACIFIC SCIENCE, Vol. XX, April 1966 
TABLE 2 
Bilateral Variation in the Number of Gill Rakers 
SAMPLE SOURCE 
(YEAR) 
SPECIES 
SEX 
NUMBER 
EXAMINED 
% 
ASYMMET- 
RICAL 
% 
ASYMMETRICAL 
TOWARD LEFT 
MEAN 
OF 
(L-R) 
100 
(P) 
Nichiro 
sockeye 
male 
70 
58.6 
58.5 
.228 
>10 
50°-53°N, 
female 
93 
63.4 
59.3 
.172 
>10 
160°-178°E (1956) 
total 
163 
61.3 
59.0 
.196 
< 5 
Karluk River 
sockeye 
male 
35 
68.6 
66.6 
.343 
> 5 
(1957) 
female 
15 
46.7 
71.4 
.200 
>40 
total 
50 
62.0 
67.7 
.300 
> 5 
Naknek River 
sockeye 
male 
12 
66.7 
75.0 
.500 
>10 
(1957) 
female 
12 
66.7 
75.0 
.583 
> 5 
total 
24 
66.7 
75.0 
.542 
< 5 
Egegik River 
sockeye 
male 
18 
55.6 
40.0 
-.056 
>50 
(1957) 
female 
23 
65.2 
60.0 
.130 
>40 
total 
41 
60.9 
52.0 
.049 
>50 
Kvichak River 
sockeye 
male 
12 
75.0 
66.6 
.250 
>20 
(1957) 
female 
18 
50.0 
66.6 
.278 
>20 
total 
30 
60.0 
66.6 
.268 
>10 
MV "Tordenskjold” 
sockeye 
male 
31 
67.7 
47.6 
-.194 
>10 
51°N, 170°W 
female 
41 
70.7 
44.8 
-.146 
>10 
(1959) 
total 
72 
69.4 
46.0 
-.167 
>10 
52°N, 172°W 
sockeye 
male 
17 
88.2 
66.7 
.530 
>10 
(1959) 
female 
10 
60.0 
33.3 
-.200 
>50 
total 
27 
77.8 
57.1 
.259 
>10 
56°N, 170° W 
sockeye 
male 
51 
66.7 
50.0 
-.059 
>40 
(1959) 
female 
42 
66.7 
64.3 
.333 
>10 
total 
93 
66.7 
56.4 
.118 
>10 
51 °N, 180° W 
sockeye 
male 
22 
59.1 
61.5 
.454 
>10 
(1959) 
female 
15 
46.7 
85.7 
.533 
> 5 
total 
37 
54.1 
70.0 
.486 
< 5 
USSR: Ozernaya River 
sockeye 
male 
46 
56.5 
57.7 
.174 
>10 
(1959) 
female 
85 
60.0 
51.0 
0 
— 
total 
131 
58.8 
53.2 
.061 
>50 
Combined sockeye 
male 
314 
64.0 
57.7 
.172 
< 1 
samples 
female 
354 
61.9 
57.5 
.136 
< 5 
total 
668 
62.9 
57.6 
.153 
< 1 
MV "Celtic” 
chum 
male 
41 
46.3 
21.1 
-.366 
< 1 
50°-57°N, 
female 
29 
62.1 
44.4 
-.172 
>10 
145°-154°W (1956) 
total 
70 
52.8 
32.4 
-.286 
< 1 
Ketchikan 
chum 
male 
11 
27.3 
33.3 
-.090 
>50 
(1959) 
female 
9 
77.8 
71.4 
.333 
>10 
total 
20 
33.0 
60.0 
.100 
>50 
USSR : Ozernaya River 
chum 
male 
63 
61.9 
43.6 
-.111 
>40 
(1959) 
female 
39 
51.3 
45.0 
-.027 
>50 
total 
102 
57.8 
44.1 
-.078 
>40 
Bolshaya River 
chum 
male 
22 
63.6 
50.0 
.045 
>50 
(1959) 
female 
67 
58.2 
51.3 
.015 
>50 
total 
89 
59.6 
50.9 
.022 
>50 
Okhotsk River 
chum 
male 
29 
44.8 
61.5 
0 
— - 
(1959) 
female 
42 
47.6 
40.0 
-.119 
>30 
total 
71 
46.5 
48.5 
-.070 
>30 
