ALASKA FISHERY AND FUR-SEAL INDUSTRIES, 1921. 85 



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



St. Paul. 



6-year-old males, esti- 

 mated: 

 5-vear-old males, Aug. 



"10,1920 



5-year-old males killed 

 falll920 



5-year-old males end 

 "1920 



Natural mortality, 20 

 per cent 



6-year-old males brgin- 

 ning 1921 



6-vear-old males killed 

 "1921 



6-year-old males, Aug. 

 10, 1921 



Surplus bulls, 7 years and 

 over, estimated: 



6-year-old males, Aug. 

 10, 1920 



6-year-old males killed 

 fall 1920 



6-vear-old males end of 

 "1920 



Natural mortality, 20 

 per cent 



7-vear-old males begin- 

 ■mngl921 



Surplus bulls, Aug. 10, 

 1920 



Surplus bulls killed fall 

 1920 



Surp'us bulls end of 

 192) 



Natural mortality, 30 

 per cent 



4,882 

 2 



St. George. 



3,904 



3, 89.5 



3,952 



3,952 

 791 



3,161 



5,147 

 1 



5,146 

 1 , 544 



125 

 3 



122 

 24 



201 

 40 



968 

 290 



Surplus bulls. 7 years and 

 over, estimated— Con. 

 Remaining surplus for 

 1921 



Breeding bulls of 1920. . . 



Natural mortality, 30 



per cent 



1920 bulls remaining 

 1921 



Breeding bulls of 1921 . . . 



1920 bulls remaining, 



deducted 



Increment of new bulls 

 1921 



7-vear-old males com- 

 "puted for 1921 



Surplus bulls computed 

 for 1921 



Total theoretical sur- 

 plus bull stock for 1921 



7-year-old males killed 

 in 1921 



Total .surplus in 1921... 

 New increment breed- 

 ing bulls deducted 



Surplus bulls 1921 



50 per cent deducted for 

 losses due to fighting, 

 natural causes, and 

 errors in loss percent- 

 age in previous years. . 



Surplus bulls, Aug. 10, 

 1921 



St. Paul. 



St. George. 



380 



380 



RECAPITULATION. 



Pups 



Cows 



Harem bulls 



IdlebuUs 



Yearling females 



Yearling males 



2- year-old females 



2-year-old males 



3-year-old males 



4-year-old males 



.5-year-old males 



6-year-old males 



Surplus bulls (7 years and over) . 



Total, 1921 



Total, 1920 



Numerital increase, 1921. 

 Per cent increase, 1921 . . . 



St. Paul. 



149, 865 



149, 865 



3, 443 



711 



46,565 



42,973 



36,994 



35, '78 



13,301 



6,405 



3,841 



3,895 



2,921 



St. George. 



496,457 



26, 790 



26, 790 



466 



36 



7, 882 



7,276 



6,425 



6,215 



1,367 



375 



888 



96 



380 



84,986 



Both 

 islands. 



176,655 

 176,655 

 3,909 

 747 

 54,447 

 .50,249 

 43,419 

 41,893 

 14,6 8 

 6,780 

 4,729 

 3,991 

 3,301 



.581,443 



552, 718 



28,725 



5.2 



o 



