722 
BULLETIN OF THE BUREAU OF FISHERIES 
which a fall closed season was not in effect it was necessary to determine a small portion 
of the curve by empirical methods. The curves for the 9 northern and the 7 southern 
traps were each calculated separately and combined with equal weighting to obtain 
the final curve. (See fig. 11.) 
To obtain the seasonal occurrence for coho salmon 26 traps were used; 15 located 
north of Deception Pass, 2 in the Hope Island Area, 2 in Middle Point Area, 1 at 
Dungeness Spit, and 6 in Admiralty Inlet. They fished from 1900-1934, taking 
5,652,592 fish. 
For the chum salmon, as for the pinks, a northern and a southern curve were each 
calculated and then combined. However, in the case of the chums, the southern curve 
was given double weight, as more chums are always caught in the southern areas. 
A total of 13 traps were used; 7 north of Deception Pass and 6 in Admiralty Inlet, 
catching 946,094 fish. The curves for all species are given in table 9 and shown in 
fig. 11. 
Table 9. — Seasonal occurrence in Puget Sound traps 
Percentage occurrence 
weeK ending— 
Sockeye 
King 
Pink 
Coho 
Chum 
Sockeye 
King 
Pink 
Coho 
Chum 
Apr. 21 
0. 425 
0. 425 
1.353 
1.778 
0. 391 
2.259 
0.018 
0. 391 
4. 037 
0. 018 
May 12 
.351 
3. 212 
.035 
0. 001 
.742 
7.249 
.053 
0. 001 
.328 
3.649 
.059 
.001 
1.070 
10. 898 
.112 
.002 
May 26 
.149 
3.780 
0. 002 
.054 
.002 
1.219 
14. 678 
0. 002 
.166 
.004 
June 2 
.061 
4. 166 
.002 
.084 
.006 
1.280 
18. 844 
.004 
.250 
.010 
June 9 
.018 
4. 770 
.005 
.080 
.011 
1.298 
23. 614 
.009 
.330 
.021 
June 16. 
.015 
5. 145 
.006 
.103 
.008 
1.313 
28. 759 
.015 
.433 
.029 
Juno 23_— 
.087 
5. 921 
.007 
.175 
.007 
1.400 
34. 680 
.022 
.608 
.036 
June 30 
.468 
6. 330 
.010 
.174 
.013 
1.868 
41.010 
.032 
.782 
.049 
July 7 
2. 206 
7.292 
.017 
.351 
.026 
4.074 
48. 302 
.049 
1. 133 
.075 
July 14 
4. 495 
6. 696 
.027 
.393 
.032 
8. 569 
54. 998 
.076 
1.526 
.107 
July 21 
8.408 
6. 252 
.170 
.466 
.063 
16. 977 
61.250 
.246 
1.992 
.170 
July 28 
16. 098 
6.188 
1.463 
.532 
. 172 
33. 075 
67. 438 
1.709 
2. 524 
.342 
Aug. 4 
26. 344 
6. 072 
3. 660 
.709 
.450 
59.419 
73. 510 
5. 369 
3. 233 
.792 
Aug. 11 
20.911 
6. 149 
6. 875 
.962 
.816 
80. 330 
79. 659 
12. 224 
4.195 
1.608 
Aug. 18. . _ 
11.224 
5. 565 
10.117 
1.413 
1.234 
91. 554 
85. 224 
22. 361 
5. 608 
2. 842 
Aug. 25.. 
5. 542 
4.456 
21. 120 
2.717 
1.863 
97. 096 
89. 680 
43. 481 
8. 325 
4. 705 
Sept. 1 
1.530 
3. 406 
23. 837 
3.911 
1.835 
98. 626 
93. 086 
67. 318 
12. 236 
6. 540 
Sept. 8 
.493 
2. 875 
19. 591 
6. 953 
1.977 
99. 119 
95. 961 
86. 909 
19. 189 
8. 517 
Sept. 16... 
.071 
2.074 
8. 660 
10. 795 
2. 298 
99. 190 
98. 035 
95. 569 
29. 984 
10.815 
Sept. 22. 
. 121 
1.105 
3. 452 
12. 652 
3. 246 
99. 311 
99. 140 
99. 021 
42. 636 
14. 061 
Sept. 29 
. 132 
.451 
.830 
12. 129 
7. 376 
99. 443 
99. 591 
99. 851 
54. 765 
21. 437 
Oct. 6 
.048 
.167 
.107 
12. 628 
9. 244 
99, 491 
99, 758 
99, 958 
67. 393 
30. 681 
Oct. 13... 
.018 
.069 
.041 
11.978 
11.803 
99. 509 
99. 827 
99. 999 
79. 371 
42. 484 
Oct. 20 
.036 
.041 
.004 
8. 357 
12. 656 
99. 545 
99. 868 
100. 003 
87. 728 
55. 140 
Oct. 27 
.096 
.038 
.003 
5.313 
13. 643 
99. 641 
99. 906 
100. 006 
93. 041 
68. 783 
.099 
.064 
3. 108 
10. 335 
99. 740 
99. 970 
96. 149 
79. 118 
.258 
.030 
1.628 
7. 131 
99. 998 
100. 000 
97. 777 
86. 249 
1.502 
5. 747 
99. 279 
91. 996 
.667 
3.282 
99. 946 
95. 278 
.051 
1.865 
99. 997 
97. 143 
Dec. 8 ... 
.005 
1.097 
100. 002 
98. 240 
.431 
98. 671 
.669 
99. 340 
.553 
99. 893 
.066 
99. 959 
Jan. 12 
.015 
99. 974 
.006 
99. 980 
Cumulative percentage occurrence 
The seasonal occurrence of each species is quite distinct from any of the others 
and the modes of the five curves are about a month apart; kings, sockeyes, pinks, 
cohos and chums following in that order. 
