this report. For the second experiment (16 August), 

 only 13.8% of the tags were recovered because it was 

 close to the end of the fishing season. The most promi- 

 nent feature of the recoveries from both of these 

 releases was the rapid movement of a large proportion 

 of the tagged fish into Frederick Sound; 66.4% of the 

 total recoveries from both releases were made in 

 Frederick Sound. Less than 1% were made in lower 

 Chatham Strait. Although there was some dispersion 

 northward into middle Chatham Strait, few tagged 

 fish traveled as far north as upper Chatham Strait. It 

 appears that most fish in the vicinity of trap WE-69 in 

 August were en route to streams in Frederick Sound 

 and Stephens Passage. 



The most noticeable feature of the distributions of 

 recoveries from the six experiments in 1941 (Fig. 10, 

 Table 9) is the uniformly high percentage returned 

 from Frederick Sound — 70.8%. In 1941 the movement 

 of tagged pink salmon from middle Chatham Strait 

 into Frederick Sound was even more rapid and more 

 pronounced than in 1940. Only a negligible movement 

 in the direction of Icy Strait was indicated. Recoveries 

 in middle and upper Chatham Strait were not large, 

 even though they were augmented by heavy recap- 

 tures in trap WE-67 just 2 miles from the point of 

 release. Proportionately more of the tagged fish 

 entered lower Chatham Strait in 1941 than in either 

 1940 or 1942. This was partly the result of the timing 

 of the releases. Only in 1941 were releases made in Ju- 

 ly; recoveries in lower Chatham Strait from these July 

 releases were higher than from the August releases in 

 any of the 3 yr (Table 9). In 1941, 2.7% of the total 

 recoveries from all six releases were made in lower 

 Chatham Strait. 



The geographical distributions of the recoveries 

 from the two releases in 1942 in middle Chatham 

 Strait were similar (Fig. 11, Table 9). The distribution 

 of recoveries in 1942 differed markedly from those in 

 1940 and 1941. Tagged fish were recaptured in about 

 equal numbers in Frederick Sound and in middle 

 Chatham Strait. The 48.6% of the recoveries made in 

 Frederick Sound are considerably lower than the 

 66.4% in 1940 and the 70.8% in 1941. Recoveries in 

 lower Chatham Strait were scarce in 1942; only two 

 tagged fish were reported from there. Recovery 

 patterns for both experiments in 1942 were 

 symmetrically distributed about the release point. 



In summary, tagged fish released in middle 

 Chatham Strait showed little movement into the 

 lower Chatham Strait area. In 1941, and to a 

 somewhat lesser extent in 1940, there was a strongly 

 directed movement of tagged pink salmon from mid- 

 dle Chatham Strait into Frederick Sound and 

 southern Stephens Passage. Fish tagged in 1942 did 

 not exhibit a strongly directed movement but rather 

 milled about in the general area of the release point in 

 middle Chatham Strait, gradually dispersing both 

 northward into Chatham Strait and eastward into 

 Frederick Sound. The difference between the 



migratory behavior of fish tagged in 1942 and those 

 tagged in 1940 and 1941 in middle Chatham Strait is 

 exactly the same as observed for fish tagged in Icy 

 Strait and upper Chatham Strait in these 3 yr. 



Lower Chatham Strait. — There were 10 ex- 

 periments in lower Chatham Strait in 1938, 7 in 1939, 

 2 in 1941, and 1 in 1942. Only four of the experiments 

 in each year in 1938 and 1939 provided enough 

 recoveries to give a coherent picture of the movement 

 of the tagged fish. All of the releases in lower Chatham 

 Strait were made from either trap EA-45 or trap EA- 

 46 in Tebenkof Bay. 



The results of the 1938 experiments (Fig. 12, Table 

 10) show that the tagged pink salmon were recaptured 

 mainly in lower Chatham Strait — 79.5% of the 

 recoveries were made in the six traps along the west 

 coast of Kuiu Island within 22 miles of the point of 

 release. Of the combined recoveries from the four 

 releases, 15.8% were made in Frederick Sound, 2.1% 

 in middle Chatham Strait, and 2.6% in Sumner 

 Strait. 



Although the total percentage of recoveries from the 

 1939 experiments (Fig. 13, Table 10) remained 

 remarkably constant from the first release on 16 July 

 until the last on 13 August, the geographic distribu- 

 tion of the recoveries changed drastically between the 

 first and last releases. The percentage recoveries 

 returned from Frederick Sound were as follows: 91.8% 

 for the 16 July release, 62.7% for 4 August, 33.1% for 6 

 August, and 16.5% for 13 August. And, as the percent- 

 age of recoveries taken in Frederick Sound decreased, 

 the percentage taken in lower Chatham Strait in- 

 creased (Table 10). The strong movement into 

 Frederick Sound for the earlier releases in 1939 is in 

 sharp contrast to the results obtained in 1938. 

 Although the timing of the 1938 releases was similar 

 to that of the 1939 releases, the relative numbers of 

 recoveries made in Frederick Sound and Stephens 

 Passage were consistently low for all of the 1938 ex- 

 periments. 



There was a minor movement of tagged pink 

 salmon into middle Chatham Strait and into Sumner 

 Strait in 1939; 6.4% of the recoveries were from middle 

 Chatham Strait and 5.2% from Sumner Strait. For 

 the last release in 1939, as in 1938, the fish showed a 

 strong tendency to linger in Tebenkof Bay near the 

 release trap. 



The distribution of recoveries from the two tagging 

 experiments in lower Chatham Strait in 1941 are 

 shown in Figure 14 and Table 10. Releases were made 

 on 10 and 16 August; the recoveries were restricted 

 because it was close to the end of the fishing season. 

 For both experiments the recoveries were apportioned 

 in a similar manner between general recovery areas 

 (Table 10): 62.4% of the pooled recoveries were from 

 Frederick Sound, 32.0% from lower Chatham Strait, 

 and 5.6% from upper and middle Chatham Strait. 

 The center of density of the tagged fish released on 10 



19 



