664 
BULLETIN OF THE BUREAU OF FISHERIES 
Seven tagging experiments were carried on at Ruins Point in 1924 and 1925, and 
one at Cape Decision in 1927. Since these experiments were carried on at different 
times in the season, from July 12 to August 3, their results should indicate the desti- 
nations of the pink salmon that migrate through Sumner Strait at all times of the 
season. A total of 1,629 pink salmon were tagged, of which 590, or 36.2 percent, were 
recovered. Of these, 393, or 19.8 percent, were captured in Sumner Strait, area 5; 116, 
or 7.1 percent, in upper Clarence Strait, area 3; 9, or 0.6 percent, in lower Clarence 
Strait, area 2 ; 30, or 1 .8 percent, in lower Clarence Strait, area 1 ; and 60, or 3.7 percent, 
along the northwest shore of Prince of Wales Island, Chatham Strait, and Frederick 
Sound. Hence it may be assumed that most of the pink salmon migrating into 
Sumner Strait are bound for localities in the strait and the northern regions of Clarence 
Strait, with only a small percentage migrating to localities in the lower regions of 
Clarence Strait. It is also important to note that of the 52 tagged salmon recovered 
in middle Clarence Strait, area 3, 33 were captured in Ernest Sound, indicating that 
many of the Sumner Strait pink salmon use the northern region of Clarence Strait 
only as a means of reaching Ernest Sound and its adjoining channels. 
TAGGING EXPERIMENTS AT POINT COLPOYS 
Further and more exact proof of this distribution of the Sumner Strait pink 
salmon in Clarence Strait and Ernest Sound may be found in an analysis of the 
results from the Point Colpoys 
taggings. A total of five tagging 
experiments were carried on at 
Point Colpoys; one on July 10, 
1926, one each on July 26 and 30, 
1927, one on August 13, 1935, and 
one on August 16, 1936. Thus, 
these experiments cover a period 
from July 10 to August 16 and rep- 
resent both the odd- and even-year 
runs in equal proportion. The 
results were compiled in a manner 
similar to the procedure followed 
with the Clarence Strait data. In 
other words, they were used to 
show the seasonal differences in the 
distribution of the pink salmon to 
the spawning localities in the eastern section of Sumner Strait and its adjoining 
channels, and in Clarence Strait and Ernest Sound. 
The percentages of the tagged pink salmon recovered in the various geographic areas 
from each of the experiments are given in figure 5. From an inspection of this figure 
it will be noticed that very few of the salmon tagged at Point Colpoys were recovered 
in area 5 (Sumner Strait). The seasonal trend in the percentages of the recoveries 
in this area was not very definite and cannot be considered as indicative of any sea- 
sonal change in the number of pink salmon bound for the area. The seasonal trends 
in the percentages of recoveries in areas 3 and 4, on the other hand, were very marked 
and are certainly indicative of a seasonal increase in the number of pink salmon bound 
for the localities in area 4, and a definite seasonal decrease in the numbers bound for 
the localities in area 3. The percentage of recoveries in area 2, like those in area 5, 
area 5 4 3 2 J 
DATE or TAGGING & AREA °r RECOVERY 
Figure 5.— Trends in the percentage recoveries of tagged pink salmon 
from the 1926, 1927, 1935, and 1936 tagging experiments at Point Col- 
poys. 
