I I h" I 



' cs 'fs' sp 



MILES FROM TRAP SITE 



Figure 6. — Tag recoveries per trap per time period by 20-inile 

 intervals measured from the point of release in upper Chatham 

 Strait, 1940. 



fish from both the July and August releases in upper 

 Chatham Strait were recovered to the northwest of 

 the point of release in northern Chatham Strait and in 

 Icy Strait, but most tags were recovered in middle 

 Chatham Strait and in Frederick Sound. For all of the 

 1941 releases except the last one on 9 August, the 

 center of density of the tagged population moved 

 rapidly to the middle Chatham Strait area and 

 remained there for the first l'/2 wk after release (Fig. 

 7). For the 9 August release the center of maximum 

 density shifted from middle Chatham Strait to 

 Frederick Sound at the beginning of the second week. 

 There was a minor movement of tagged fish into lower 

 Chatham Strait in 1941. The major movement, 

 however, was clearly eastward into Frederick Sound 

 from middle Chatham Strait. Most of the recoveries 

 were made in Chatham Strait during the first week 

 after release. Of course, the usual trickle of scattered 

 recoveries continued until the end of the fishing 

 season. The recovery percentage of 46% from the 26 

 July release was unusually high and was the result of 

 unusually high recovery percentages in both Chatham 

 Strait and Frederick Sound. 



Six releases were made in upper Chatham Strait in 

 1942, all quite late in the season (Fig. 8, Table 8). The 



Table 8.— Recovery areas of tags released from traps in Upper Chatham Strait, 1940-42. 



15 



