Table 18. --Estimates of the pup population based on recoveries of 

 tagged male seals at ages 3 and 4, Pribilof Islands, Alaska, year 



classes 1958-61 



1 Age 3 only. 



n = number of 3- and 4-year-old males killed from each year class. 

 Males accidentally taken during the female kill are excluded. 



t = number of tags applied to each year class. 



s = number of 3- and 4-year-old tagged and tag-lost m a 1 e s recov- 

 ered from each year class during the male kill. 



N = estimated number of pups in each year class at time of tagging; 

 (n + l)(t+l) 



(s + 1) 



Table 19. --Estimated number of pups born, Pribilof Islands, Alaska, 



year classes 1951-62 1 



See footnote 2, p. 29, for source of estimates 1951-59. 

 From table 18, this report. 

 From table 17, p. 16, this report. 



17 



