SALMON AND SALMON FISHERIES OF SWIFTSURE BANK 
787 
Data were available from 26 traps which fished throughout the duration of the 
coho run in most of the years from 1911-34. Districts selected (see figs. 2 and 3) 
and number of traps were as follows: Point Roberts 2, Boundary Bay 4, Birch Bay 5, 
Rosario Strait 4, Dungeness Spit and Middle Point 3, Admiralty Bay 3, Bush Point 3, 
and Hope Island 2. The total number of fish included in the catches of these traps 
was 5,652,592. From these data the average proportions of the season’s catch taken 
in each 7-day period by the traps in various districts were calculated. These figures 
are presented in table 38. Because of the essential similarity in occurrence, Point 
Roberts and Boundary Bay have been grouped, as have Admiralty Bay and Bush 
Point. 
Table 38. — Seasonal occurrence of coho salmon from traps; proportion of total catch taken in each 7-day 
period 
Area 
Week ending — 
Point 
Roberts 
Bound- 
ary Bay 
Point 
Roberts 
and 
Bound- 
ary Bay 
Birch 
Bay 
Rosario 
Strait 
Dunge- 
ness Spit 
and 
Middle 
Point 
Admi- 
ralty 
Bay 
Bush 
Point 
Admi- 
ralty Bay 
and Bush 
Point 
Hope 
Island 
All dis- 
tricts 
May 5 
0.062 
0.002 
0.056 
0.044 
0.018 
May 12 
0.090 
.038 
.202 
.024 
.056 
.035 
May 19__ 
0.822 
0.871 
0.046 
.124 
. 105 
.216 
.034 
.071 
.059 
May 26 
.554 
.588 
.024 
. 100 
.077 
.138 
.041 
.073 
.054 
June 2 
.496 
.526 
.327 
.077 
.068 
.157 
.072 
.107 
.084 
June 9 
.265 
.281 
.348 
.073 
.070 
. 131 
.069 
.094 
.080 
June 16 
.148 
0. 162 
. 154 
.297 
.121 
.072 
.224 
. 103 
. 151 
. 103 
June 23 
.143 
3.703 
1. 207 
.396 
.114 
.086 
.494 
.158 
.298 
. 175 
June 30. 
.461 
1.058 
.627 
.343 
.132 
.127 
.494 
. 132 
.302 
0.001 
.174 
July 7 
.277 
.649 
.414 
.695 
.174 
.261 
1.273 
.227 
.757 
.003 
.351 
July 14 
.207 
1. 944 
.937 
.676 
.370 
.451 
.867 
.447 
.667 
.003 
.393 
July 21 
.526 
1. 460 
.946 
.940 
.636 
1.214 
.730 
.405 
.601 
.057 
.466 
July 28.. 
.451 
1.610 
1.001 
1.210 
.784 
1.781 
.599 
.565 
.583 
.081 
.532 
Aug. 4 
1.053 
1.358 
1. 171 
1.367 
1. 127 
2. 600 
.613 
. 745 
.681 
.421 
.709 
Aug. 11 
.518 
1.464 
.962 
1. 810 
1.484 
3.684 
.790 
.817 
.808 
1.825 
.902 
Aug. 18 
.517 
1. 512 
.985 
1.880 
1.915 
3. 563 
1.269 
1.540 
1.412 
3. 178 
1.413 
Aug. 25 
2.018 
2.373 
2. 132 
2.997 
3.998 
4. 938 
2. 853 
2. 809 
2. 829 
4.457 
2.717 
Sept. 1 
5.068 
5. 117 
4. 950 
6.393 
6.091 
7. 840 
3.732 
4. 026 
3.891 
5.366 
3.911 
Sept. 8. 
11.926 
6.476 
9.020 
7. 805 
10. 671 
8. 335 
6.955 
6. 191 
6.495 
7. 853 
6. 953 
Sept. 15 
12. 540 
14. 586 
13. 173 
13.341 
13. 462 
7. 360 
10. 041 
9. 459 
9.689 
10. 329 
10. 795 
Sept. 22 
15. 238 
16. 145 
15. 262 
10. 382 
13.845 
11.857 
13. 724 
13. 382 
13. 485 
14.373 
12. 652 
Sept. 29.. 
15. 194 
11.935 
13.513 
9. 271 
11.967 
12. 869 
13. 004 
13.411 
13. 200 
12. 789 
12. 129 
Oct. 6... 
9. 737 
8. 276 
9. 127 
9. 126 
9. 950 
11.686 
14. 033 
14.038 
13. 991 
14. 159 
12.628 
Oct. 13 
8. 501 
9. 454 
8.819 
10. 385 
10.211 
10. 076 
12. 091 
12. 479 
12. 279 
12.351 
11.978 
Oct. 20.. 
4. 209 
7. 579 
5. 221 
9. 648 
6. 339 
4.894 
6. 894 
9.025 
8.091 
6. 629 
8.357 
Oct. 27.. 
6. 042 
2. 681 
5.315 
7. 727 
4. 149 
4. 041 
3.897 
4. 862 
4. 441 
2. 993 
5.313 
Nov. 3_ 
2. C31 
.459 
2.314 
1.756 
1. 553 
1.845 
2. 256 
2. 290 
2. 270 
1.362 
3.108 
Nov. 10 
.457 
.484 
.810 
.441 
1. 262 
.939 
1.061 
.914 
1.628 
Nov. 17 
1.053 
1. 000 
1.000 
.546 
1.502 
Nov. 24 
.547 
.528 
.301 
.667 
Dec. 1 
.044 
.043 
.008 
.051 
Dec. 8 
.003 
.003 
.005 
Total.. 
99.999 
100.001 
100. 000 
100. 000 
99.998 
100. 000 
100. 000 
100. 000 
100. 001 
99. 999 
100. 002 
Comparing the data for the Point Roberts-Boundary Bay area with those for 
Birch Bay, occurrence in both areas is slight until the latter part of August, when the 
runs increase abruptly in size. The run at Point Roberts and Boundary Bay increases 
steadily to a peak in the week ending September 22, and abundance decreases mate- 
rially thereafter, with minor fluctuations, to the end of the season. Birch Bay clearly 
shows the presence of the same run as that of the former area, but occurrence is 
distinctly bimodal. The peak of the main run occurs in the week ending September 
15, after which there is a definite decrease in numbers. A second run of smaller pro- 
portions follows, reaching its peak between October 6 and October 20, the run falling 
71941 — 38 7 
