SALMON AND SALMON FISHERIES OF SWIFTSURE BANK 809 
Table 50 . — Seasonal occurrence in traps of odd-year pink salmon in northern and southern districts , 
1919-38 
Week ending 
North of Deception Pass 1 
South of Admiralty Head * 
Percentage 
Cumulative 
percentage 
Percentage 
Cumulative 
percentage 
0. 003 
.004 
.010 
.011 
.014 
.019 
.034 
.051 
.302 
2. 759 
6.704 
11.994 
15. 579 
27. 969 
17. 887 
12. 136 
3.464 
.395 
.659 
.006 
.001 
0. 003 
.007 
.017 
.028 
.042 
.061 
.095 
. 146 
.448 
3.207 
9.911 
21. 905 
37. 484 
65. 453 
83. 340 
95. 476 
98. 940 
99. 335 
99. 994 
100. 000 
100. 001 
June 2 
June 16. 
June 23 
J u ne 30 
July 7_ 
0.002 
0.002 
.039 
.206 
.822 
2. 578 
7. 232 
21. 502 
51.289 
78. 334 
92. 189 
98. 697 
99. 698 
99. 906 
99. 986 
99. 993 
99. 998 
Julv 21 . 
.037 
. 167 
.616 
1.756 
4. 654 
14. 270 
29. 7S7 
27. 045 
13. 855 
6. 508 
1.001 
.208 
.080 
.007 
.005 
Julv 28 
Aug. 18 
Sept. 8 
Sept. 15 
Sept. 22 
Sept. 29 
Oct. 6 
Oct. 13 
Oct. 20 
Oct. 27 
Number of fish 
2, 537, 611 
1, 929, 504 
Number of traps 
9 
7 
i Week ending Sept. 15, empirically determined. } Week ending Sept. 1, empirically determined. 
Speaking of the trap fishery Kathbun says: 
The trap nets would appear, however, to afford the best means for the capture of the humpback 
in the salt water, and they are sometimes so taken in immense quantities during the sockeye run. 
In fact, they often compose by far the larger part of the catch, and as it is generally impracticable 
to do the sorting in the water at the net, the entire catch may be emptied into scows and the over- 
hauling take place at the wharves. Here the humpbacks are culled out and discarded, causing a 
wholesale destruction of the species. 
In addition to discarding pink salmon, the traps were often closed in odd-numbered 
years while some sockeyes were still available, in order to avoid capturing the later- 
running pink salmon for which they had no use. Owing to these factors during 
the early years of the fishery, the total catch figures are entirely unreliable for measur- 
ing abundance. Since the total catches of the individual traps do not give us an 
adequate measure of abundance in these years the problem has first been attacked 
by plotting the frequency distributions of the pink-salmon catches of all regularly 
operated traps north of Deception Pass in the odd-numbered years from 1899-1933 
(see table 51). 
From 1899-1905 there was practically no demand for pink salmon, and only small 
quantities were used; the remainder was discarded. This is especially obvious in 1901 
and 1905, both of which were big years for sockeye. 
