Bilateral Asymmetry in Salmon — Landrum 
201 
TABLE 4 
Bilateral Variation in the Number of Pectoral Fin Rays 
% 
% 
MEAN 
SAMPLE SOURCE 
NUMBER 
ASYMMET- 
ASYMMETRICAL 
OF 
100 
(YEAR) 
SPECIES 
SEX 
EXAMINED 
RICAL 
TOWARD LEFT 
(L-R) 
(P) 
Nichiro 
sockeye 
male 
40 
25.0 
60.0 
.075 
>40 
50°-53°N, 
female 
69 
21.7 
53.3 
.014 
>50 
160°-178°E (1956) 
total 
109 
22.9 
56.0 
.037 
>40 
Karluk River 
sockeye 
male 
36 
19.4 
57.1 
.028 
>50 
(1957) 
female 
16 
31.2 
40.0 
-.062 
>50 
total 
52 
23.0 
50.0 
0 
— 
Naknek River 
sockeye 
male 
14 
42.8 
16.6 
-.286 
>10 
(1957) 
female 
17 
29.4 
60.0 
.059 
>50 
total 
31 
35.4 
36.3 
-.097 
>20 
Egegik River 
sockeye 
male 
22 
22.7 
40.0 
-.045 
>50 
(1957) 
female 
23 
13.0 
66.7 
.043 
>50 
total 
45 
17.7 
50.0 
0 
— 
Kvichak River 
sockeye 
male 
13 
15.3 
50.0 
0 
— • 
(1957) 
female 
18 
16.6 
33.3 
-.056 
>50 
total 
31 
16.1 
40.0 
-.032 
>50 
Ozernaya River 
sockeye 
male 
47 
17.0 
75.0 
.085 
>10 
(1959) 
female 
92 
22.8 
57.1 
.022 
>30 
total 
139 
20.9 
62.1 
.058 
>20 
Combined sockeye 
male 
172 
22.1 
52.6 
.017 
>50 
samples 
female 
235 
22.1 
53.8 
.021 
>40 
total 
407 
22.1 
53.3 
.019 
>40 
MV "Celtic” 
chum 
male 
41 
31.7 
46.1 
-.024 
>50 
50°-57°N, 
female 
31 
29.0 
44.4 
-.032 
>50 
145°-154°W (1956) 
total 
72 
30.5 
45.4 
-.027 
>50 
Ketchikan 
chum 
male 
13 
23.0 
66.7 
.07 6 
>50 
(1959) 
female 
10 
40.0 
75.0 
.200 
>10 
total 
23 
30.4 
71.4 
.130 
>10 
Ozernaya River 
chum 
male 
62 
19.4 
41.6 
-.032 
>50 
(1959) 
female 
38 
15.8 
83.3 
.105 
>10 
total 
100 
18.0 
55.6 
.020 
>50 
Bolshaya River 
chum 
male 
23 
13.0 
66.7 
.043 
>50 
(1959) 
female 
68 
23.5 
75.0 
.118 
>20 
total 
91 
20.9 
73.7 
.099 
>20 
Okhotsk River 
chum 
male 
29 
10.3 
66.7 
.034 
>50 
(1959) 
female 
42 
16.7 
57.1 
.024 
>40 
total 
71 
14.1 
60.0 
.028 
>50 
Combined chum 
male 
168 
23.8 
50.0 
-.006 
>50 
samples 
female 
189 
22.2 
66.7 
.074 
>50 
total 
357 
21.3 
59.2 
.036 
>50 
Ketchikan 
pink 
male 
38 
13.2 
60.0 
.026 
>50 
(1959) 
female 
12 
16.7 
100.0 
.166 
>20 
total 
50 
14.0 
71.4 
.060 
>20 
Prince William Sound 
pink 
male 
40 
15.0 
66.7 
.050 
>50 
(1959) 
female 
7 
42.8 
00.0 
-.428 
>10 
total 
47 
19-1 
44.4 
-.021 
>50 
Combined pink 
male 
78 
14.1 
63.6 
.042 
>10 
samples 
female 
19 
26.3 
40.0 
-.053 
>50 
total 
97 
16.5 
56.2 
.021 
>50 
