cs 



I I I i'oo 100 I I I 100 100 I I I i 

 I 'LC5 Fs'sp' rs ' ii r.s F?;'<;p ' rs ' m r<; pc' <;pi 



CS 



100 I I I >00 100 I ^00 



'LCSFS'SP' CS ' 'LCSFS'SP' CS ' ■! r«; F=;l i^p- 



MILES FROM TRAP SITE 



'LCS FS' SP" 



Figure 13. — Tag recoveries per trap per time period by 20-inile intervals measured from the point of release 



in lower Chatham Strait, 1939. 



RELATIVE ABUNDANCE AND 



MIGRATION AS DETERMINED 



FROM TRAP CATCH DATA 



Neither total trap catch nor catch per trap could be 

 used to estimate the size of the pink salmon runs in 

 the different years because in all years and in all areas 

 the fishing season closed about the time of greatest 

 abundance of fish. Thus, catch data did not measure 

 the late parts of the runs. Furthermore, no informa- 

 tion was available on seine catches or on escapement 

 to spawning streams. Both total trap catch and catch 

 per trap by statistical area are listed in Table 11. The 



number of traps used in the calculations was the 

 number of traps for which weekly catches were known. 

 The catch per trap and total catch in different years 

 were not proportional; in particular, the largest catch 

 was taken in 1941 when the fewest traps operated. The 

 total catch was influenced more by the number of fish 

 available than by the number of traps. 



Both total catch and catch per trap show that the 

 largest run was in 1941 and the smallest in 1945. Runs 

 in 1938 and 1940 were approximately equal and were 

 larger than the 1939 run but smaller than the 1942 



run. 



The catch data and tagging data are in general 

 agreement with respect to the indicated paths of 



24 



