Table 16. --Estimated number of 2- and 3-year-old male seals, year 

 classes 1963-66, from recoveries of marked male seals, 

 Pribilof Islands, Alaska 



1/ Numbers recovered include those of unknown age. 



2/ Number of tags applied adjusted to compensate for double tag 

 loss and according to the observed age distribution of tagged animals 

 when recovered. See example in section "Number of male seals ages 

 1 to 2 years. " 



Table 17. --Survival of male seals, year classes 1961-66, 

 Pribilof Islands, Alaska 



Year 

 class 



Males 

 bornL/ 



Males alive 



at time of 



shearing in 



1 / 



early August— 7 



Males alive ii 



September 

 1 3 months later 



2/ 



Males 



killed 



at ages 



2 to 5 



Thousands Thousands 



Proportion of 



yearling group 



represented 



by the kill 



Thousands Percent Thousands Percent 



1/ Taken from table 13 but converted to an estimate for males by 

 dividing the totals given there by two on the assumption that the sex ratio 

 at birth and among the dead pups on the rookeries is 1:1. 



2/ Taken from table 15 of this report and table 18 of "Fur seal 

 investigations, 1967" (Marine Mammal Biological Laboratory, 1970a). 



3/ The kill of 5-year-old males estimated to be 2, 000 and added 

 to the observed totals at age 2 to 4. 



4/ Based on recoveries through age 3 and hence not strictly 

 comparable with other figures in this column. 



20 



