were again used and were distinguishable from those 

 used on 5 August only by a hole punched in them. 

 Tags with the number 13 were also released on 12 

 August. The original records for 1945 showed con- 

 siderable confusion in differentiating between number 

 12 tags with and without the punched hole. Thus, 

 number 12 tags recovered after 11 August could not be 

 assigned to a single release. 



A total of 456 (33.6'^) of the tags were recovered; 

 41.6% of the total recoveries were made at the point of 

 release. Four hundred and eight of the tags were 

 recovered in Salisbury Sound, 12 in other inlets on the 

 west coasts of Baranof and Chichagof islands, 1 in 

 Sumner Strait, and 35 in Chatham Strait close to the 

 east end of Peril Strait. No tags were recovered in 

 Peril Strait or in spawning streams. 



The 1945 experiments do not provide conclusive 

 evidence on the extent of migration eastward through 

 Peril Strait. The data indicate that most fish in 

 Salisbury Sound in August remained there, but more 

 experiments are necessary. 



Only seven recoveries were made in Salisbury 

 Sound of the 19,179 tagged fish released in inside 

 waters during 1938-42. Six of the seven were released 

 in Icy Strait and upper Chatham Strait. They may 

 have traveled west through Icy Strait and then south 

 along the west coast of Chichagof Island. The remain- 

 ing recovery was released in lower Chatham Strait. 

 The fact that none of the seven were released in mid- 

 dle Chatham Strait suggests that there is no major 

 migration westward through Peril Strait. 



Distribution of Trap Recoveries from 

 Experiments in Icy Strait 

 and Chatham Strait 



The number and percent of recoveries by statistical 

 area for each experiment are listed in Tables 7 to 10 

 and illustrated in Figures 4 to 15. These figures were 

 constructed as follows: A line was drawn along the 

 center of the channel starting at the tagging station 

 and extending through the main waterways in 

 northern southeastern Alaska. The line was sub- 

 divided into 20-mile intervals in both directions from 

 the tagging station which was taken as the zero point. 

 The number of recoveries per trap in each interval was 

 calculated by alternating 3- and 4-day periods for 2 

 wk after the release; Sundays (when the fishery was 

 closed) were usually included in the 4-day periods. 

 Thus, each period included about 2% days of fishing. 

 The number of tags recovered after the first 2 wk was 

 small. The lines in Figures 4 to 15 connect the points 

 representing average numbers of recoveries per trap 

 per time period plotted at the centers of the 20-mile 

 intervals. Abbreviations used in Figures 4 to 15 are: 

 IS — Icy Strait; CS — upper and middle Chatham 

 Strait; FS — Frederick Sound; SP— Stephens Passage; 

 and LCS— lower Chatham Strait. 



In general, the experiments indicated that pink 

 salmon entered the inner waters through Icy Strait 

 and lower Chatham Strait and then spread eastward 

 to Frederick Sound and north into Stephens Passage. 

 For most experiments, fish continued to be recaptured 

 in or near the trap from which they were released until 

 the end of the season. Although the movements oi the 

 centers of maximum density for most groups of tagged 

 fish appeared to be directional, these directed 

 movements were accompanied by a wide dispersion of 

 smaller numbers of tags throughout the entire 

 northern portion of southeastern Alaska. 



Icy Strait.^ — Six experiments were conducted in Icy 

 Strait in 1941 (Fig. 4, Table 7) and three in 1942 (Fig. 

 5, Table 7). 



The recoveries from Icy Strait releases in 1941 in- 

 dicated no clear-cut differences in distribution 

 between the six experiments conducted during July 

 and August. Recoveries of tagged fish in Icy Strait 

 from releases in early August were restricted by the 

 closure of fishing about 8 August. By the third day 

 after release tagged fish from Icy Strait were spread 

 throughout middle Chatham Strait. While some mov- 

 ed rapidly others lagged behind, with the result that 

 the fish were distributed along the entire route 

 traversed. Usually the center of density of the tagged 

 population was found in middle Chatham Strait dur- 

 ing the second half of the first week (days out 4-6, Fig. 

 4). Although the tagged fish appeared to delay at the 

 entrance to Frederick Sound, by the first part of the 

 second week they were well distributed throughout 

 Frederick Sound and lower Stephens Passage. During 

 the third and fourth weeks after release it was usually 

 difficult to recognize any center of density for one of 

 the tagged populations. 



There was little migration into lower Chatham 

 Strait of the fish released in Icy Strait in either 1941 or 

 1942; 1.04% of all releases in 1941 and 0.07% of those 

 in 1942 were recovered in lower Chatham Strait. 



There were some striking differences between the 

 movements of the tagged groups in 1941 and 1942. 

 These differences may indicate a difference in the 

 racial composition of the even-year and odd-year 

 stocks in Icy Strait. Tagged pink salmon released in 

 1942 (Table 7) did not move to the east and south as 

 rapidly as those released in 1941. The proportion ul- 

 timately destined for Frederick Sound or Stephens 

 Passage seemed to be less in 1942 than in 1941. This 

 difference is especially large for the release made on 18 

 July 1942, as compared with the three July releases in 

 1941. Recoveries in Icy Strait from the July release in 

 1942 were slightly greater than from the July releases 

 in 1941, but the percentage of recoveries in waters to 

 the south and east in 1942 was markedly reduced. 

 Total percentages recovered for the August releases in 

 the 2 yr were similar; the 1942 experiments showed 

 proportionately more fish recovered in Icy Strait and 



