288 



SALMON OP THE KARLTJK RIVER, ALASKA 

 Table 41. — Data for the third 1932 marking experiment 



' See text. 



In the second experiment (table 40), 15,000 seaward migrants were marked by- 

 amputation of the adipose and right pectoral fins, 286 fish were recovered, and a 

 calculated total of 2,555 fish returned (17.0 percent). The return from the 3-, 4-, and 

 5-year marked fish was 20.7, 14.6, and 9.8 percent, respectively. 



In the third experiment (table 41), 15,000 seaward migrants were marked by 

 amputation of the adipose and left ventral fins, 364 fish were recovered, and a calcu- 

 lated total of 3,185 marked fish returned (21.2 percent). The return from the 3-, 

 4-, and 5-year marked fish was 23.7, 17.3, and 0.0 percent, respectively. 



In the. fourth experiment (table 42), 14,000 seaward migrants were marked by the 

 amputation of the adipose and left pectoral fins, 234 fish were recovered, and a cal- 

 culated total of 2,157 fish returned (15.4 percent). The return from the 3-, 4-, and 

 5-year marked fish was 16.2, 12.0, and 6.1 percent, respectively. 



Two marked fish of the 4 2 age group were recovered (table 42) . However, accord- 

 ing to the data presented, no 2-year seaward migrants were marked. Some 2-year 



