752 
BULLETIN OF THE BUREAU OF FISHERIES 
seem to be more efficacious for cohos. For these reasons the occurrence of the species 
in the troll catches do not reflect their relative runs as accurately as do those from less 
selective gear. 
Catches were available for from 174-261 trolling vessels landing at Neah Bay 
during the years from 1922-28. Because of the extreme difficulty in identifying the 
boats, no attempt was made to treat their catches individually. For both kings and 
cohos the average daily delivery per boat during each week of the season was calcu- 
lated for the individual years, and from these data the averages over the 7-year period 
were calculated. These were then determined as percentages throughout the season. 
The percentage occurrence of both species by weeks is presented in table 24. 
Table 24. — Seasonal occurrence in cape trolling gear 
Week ending— 
Percentage occur- 
rence 
Cumulative per- 
centage occurrence 
Week ending — 
Percentage occur- 
rence 
Cumulative per- 
centage occurrence 
King 
Coho 
King 
Coho 
King 
Coho 
King 
Coho 
1. 523 
1.523 
July 28 
4. 960 
6. 255 
61. 046 
45. 604 
3. eoo 
5. 123 
Aug. 4 
5. 036 
4.547 
66. 082 
50. 151 
4. 787 
1. 846 
9. 910 
1.846 
Aug. 11 
4. 494 
5. 212 
70. 576 
55. 363 
May 12 
3. 320 
.761 
13. 230 
2. 607 
Aug. 18 
4.846 
6. 585 
75. 422 
61.948 
2. 905 
2.867 
16. 135 
5. 474 
Aug. 25 
4. 477 
5.840 
79. 899 
67. 788 
4. 543 
2.072 
20. 678 
7. 546 
Sept. 1 
2. 932 
4. 608 
82. 831 
72. 396 
6. 519 
3. 139 
27. 197 
10. 685 
Sept. 8- 
2.448 
5. 515 
85. 279 
77.911 
4. 152 
2. 182 
31. 349 
12. 867 
Sept. 15 
4. 304 
6. 227 
89. 583 
84. 138 
3.669 
3. 186 
35. 018 
16. 053 
Sept. 22 
3. 493 
6.713 
93. 076 
90. 851 
4. 114 
3.861 
39.132 
19. 914 
Sept. 29 
3.882 
3.427 
96. 958 
94. 278 
3.347 
4. 717 
42. 479 
24. 631 
Oct. 6 
2. 046 
2. 450 
99. 004 
96. 728 
July 7 
4. 184 
3.813 
46. 663 
28. 444 
Oct. 13. 
.949 
2. 038 
99. 953 
98. 766 
4. 859 
5. 520 
51. 522 
33. 964 
Oct. 20 
.047 
.740 
100. 000 
99. 506 
4. 564 
6.385 
56. 086 
40. 349 
Oct. 27 
.494 
100. 000 
There is a short period of heavy catches of king salmon in early May, followed by 
the main period of occurrence lasting from June to the latter part of August. There 
is a third small run in the latter part of September which decreases immediately after 
the first week in October. The coho catches build up slowly during a period of about 
two months prior to the middle of July, remain, with some fluctuations, at that level 
until the third week in September, and decrease thereafter to the last week in October. 
A comparison of the cumulative percentage occurrence figures from trolling gear 
(see table 24) with those for cohos and kings in cape purse seines (see table 18) indicates 
some of the differences in these two fisheries. The first troll-caught kings are taken in 
the week of April 15-21, 25 percent of the catch is made by the end of May, 50 percent 
by July 14, 75 percent by August 18, and 100 percent by October 20. Seine-caught 
kings do not appear before the middle of June, 25 percent are taken by July 14, 50 
percent by August 6, 75 percent by August 22, and 100 percent by September 15. 
The trollers will have been operating for about two months before the seiners begin, 
and slightly more than 50 percent of the troll catch has been made by the time that 25 
percent of the seine fish are landed. The two curves cross during the latter part of 
August, and the seine season is over before 90 percent of the troll-caught fish are landed. 
Trollers begin landing cohos about the first of May, 25 percent of the catch is 
taken by the first of July, 50 percent during the first week in August, 75 percent by the 
first week in September, and the season ends during the latter part of October. The 
seiners begin fishing cohos about the middle of June, and 25 percent of the catch is 
