84 



U. S. BUREAU OF FISHERIES. 



years are left the same as given in the 1920 census. As the male 

 grows older his defensive powers increase. These figures are used 

 m compiling the data in this census. 



COMPLETE CENSUS. 



It is expected that in 1922 a more complete count of pup wills 

 be made and also additional counting towers constructed in the 

 most congested areas of harems. For these reasons the results of the 

 1922 census will be as nearly exact as it is possible to make them. 

 The figures in this report, which are based on estimates, are there- 

 fore presented with the provision that they may be revised should 

 sufficient reasons come to light next year for different methods 

 of forming the estimates. 



Details of census of fur seals, Pribilof Islands, as of August 10, 1921. 



Pups, counted and esti- 

 mated 



Breeding cows, 3 years 

 and over, by inference. . 



Harem bulls, counted 



Idle bulls, counted 



Yearlings, male and fe- 

 male, estimated: 

 Females born in 1920 — 

 Natural mortality, 35 

 per cent 



Yearling females, Aug. 

 10, 1921 



Males born in 1920 



Natural mortality, 40 

 per cent 



Yearling males begin- 

 ning 1921 



Yearling males killed 

 1921 



Yearling males Aug. 10, 

 1921 



2-year-olds, male and fe- 

 male, estimated: 



Yearling females, Aug. 

 10, 1920 



Natural mortality, 15 

 per cent 



2-year-old females, Aug. 

 10, 1921 



Yearling males, Aug. 10, 

 1920 



Natural mortality, 17i 

 per cent 



2-year-old males begin- 

 ning 1921 



2-year-old males killed 

 1921 , 



2-year-old males, Aug. 

 10, 1921 



3-year-old males, esti- 

 mated: 



2-ycar-old males, Aug. 

 10, 1920 



2-year-old males killed 

 fall 1920 



St. Paul. 



149, 865 



3,443 



711 



71,638 

 25,073 



46, 565 



71,637 

 28, 654 



42,983 

 10 



42, 973 



43,522 

 6, 528 



36, 994 



43,515 



7,615 



3.'i,900 

 222 



35, 678 



33, 698 

 2 



St. George. 



26, 790 



26, 790 

 466 

 36 



12, 126 

 4,244 



7,882 



12, 126 



4,&50 



7,276 



'/,276 



7,559 

 1,134 



6,425 



7,559 

 1,323 



6,236 

 21 



6,215 



5,413 

 23 



3-year-oId males, esti- 

 mated — Continued. 



2-year-old males end of 

 1920 



Natural mortality, 12i 

 per cent 



3-year-old males begin- 

 ning 1921 



3-year-old males killed 

 in 1921 



3-year-old males, Aug. 

 10, 1921 



4-year-old males esti- 

 mated: 



3-year-old males, Aug. 

 10, 1920 



3-year-old males killed 

 fall 1920 



3-year-old males end of 

 1920 



Natural mortality, 10 

 per cent 



4-year-old males begin- 

 ning 1921. 



4-year-old males killed 

 1921 



4-year-old males, Aug. 

 10, 1921 



5-year-old males, esti- 

 mated: 

 4-year-old males, Aug. 



10, 1920 



4-year-olds killed fall 

 1920 



4-year-old males end of 

 1920 



Natural mortality, 10 

 per cent , 



5-year-old males begin- 

 ning 1921 



5-year-old males killed 

 1921 



St. Paul. 



5-year-old males, Aug. 

 10, 1921 



33,696 

 4,212 



29,484 

 16,183 



13, 301 



9,344 

 233 



9,111 

 911 



8,200 

 1,795 



4,584 

 46 



St. George. 



4,538 

 454 



4,084 

 243 



3,841 



5,3S7 

 673 



4,714 

 3,347 



1,367 



1,405 

 312 



1,093 

 109 



984 

 609 



1,083 

 44 



1,03 J 

 104 



113 J 

 47 



