Table lO.r-Estimatee of the pup population based on tag recoveries from males, year classes 



1960-63, Pribllof Islands, Alaska 

 [ n = males killed from each year class; t=tags applied to each year class; s = tag recoveries 

 from males from each year class; N= estimate of year-class size at time of tagging] 



Year class 



Killed 7 July to 

 9 August 1965 

 (n) 



Tagged 

 (t) 



Tag 



recoveries 



(s) 



Population 



estimate 



(N) 



1960, 

 1961. 

 1962. 

 1963. 



Number 



1,418 

 14,638 

 22,745 



1,431 



Number 



59,981 

 49,921 

 49, 908 

 24,971 



Number 



182 

 ^ 1,524 

 ^ 2,544 



118 



Nunber 



465, 106 

 479,218 

 4^6,063 

 300, 503 



■"■ Lost-tag recoveries on St. George Island were corrected by the ratio of lost-tag to tagged 

 pups observed on St. Paul Island. 



Table 11. — Estimates of the pup population based on tag recoveries from 3- and 4-year-old males, 



year classes 1958-62, Pribilof Islands, Alaska 



[n=3- and 4-year-old males killed from each year class; t = tags applied to each year class; 

 s= tag recoveries from 3- and 4-year-old males from each year class; N = estimate 

 of year-class size at time of tagging ] 



Year class 



Killed at ages 



3 and 4 



(n) 



Tagged 

 (t) 



Tag 



recoveries 

 (s) 



RDpulation 



estimate 



(N) 



1958. 

 1959. 

 1960. 

 1961. 

 1962^ 



Nujtoer 



74,890 

 48,596 

 31,059 

 43,465 

 22,745 



Nunfcer 



49,917 

 49,881 

 59,981 

 49,921 

 49,908 



Nunteer 



5,409 

 3,324 

 3,279 

 4,432 

 2,544 



Number 



691,018 

 729,057 

 568,000 

 489,490 

 446,063 



Age 3 only. 



Table 12. — Estimates of the pup population based on tag recoveries from 3- and 4-year-old males, 

 by 5-day periods, year classes 1961-62, Pribilof Islands, Alaska 



[n= males killed each period; t = tags applied to year class; s = tag recoveries each pericjd; 

 N= estimate of year-class size at time of tagging] 



•'• Lost-tag recoveries on St; George Island were corrected by the ratio of lost- tag to tagged pups 

 observed on St. Paul Island. 



16 



