FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 

 Table 35. — Data for the second 1930 marking experiment 



285 



> See p. 284. 



Table 36. — Data for the third 1930 marking experiment 



In the third experiment, 5,000 seaward migrants were marked by amputating the 

 adipose and right pectoral fins, 107 of these were recovered, and a calculated total of 

 870 marked fish returned (17.4 percent). 



The data for the first and second experiments are considered more reliable than 

 those of the third, because more fish were marked and more fish recovered, and be- 

 cause there is the possibility that an unusual mortality occurred among the fish of the 

 third experiment. Some of the seaward migrants, marked by removal of the adipose 

 and right pectoral fins appeared to have a slight "list" and appeared to be mamtaining 

 balance with difficulty. 



Grouping the data for the first and second experiments, 50,000 were marked, 

 1,297 were recovered, and a calculated total of 10,495 marked fish returned (21.0 

 percent). The return from the marked 2-, 3-, 4-, and 5-year seaward migrants was 

 2.4, 16.6, 28.0, and 32.0 percent, respectively. 



