164 



U. S. BUREAU OF FISHERIES 



Distribution of pups on the Pribilof Islands, August 10, 1925, compared with dis- 

 tribution in 1924 



Rookery 



St. Paul Island: 



Kitovi 



Lukanin 



Gorbatch 



Ardiguen 



Reef. 



Sivutch__ 



Lagoon 



Tolstoi _. 



Zapadni 



Little Zapadni 



Zapadni Reef 



Polovina 



Polo vina Cliffs 



Little Polovina 



Morjovi 



Vostochni 



Total 



St. George Island: 



North 



Staraya Artil 



Zapadni ._ 



South 



East Reef 



East Cliffs 



Total 



Total (both islands) 



Living 



7. 365 



3,537 



IS, 818 



1,753 



37, 569 



11.381 



151 



22, 133 



21, 198 



10, 720 



379 



7,632 



4, 165 



1, 507 



2,723 



30, 286 



181,317 



14, 830 

 11,042 

 1,582 

 369 

 3,396 

 9.694 



40,913 



222, 230 



Dead 



163 



43 



557 



285 



1 



312 



371 



275 



3 



119 



79 



39 



56 



643 



Total 



7.475 



3, 615 



18, 981 



1,796 



38, 126 



11,666 



152 



22, 445 



21. 569 



10, 995 



382 



7,751 



4,244 



1,546 



2,779 



30, 929 



Per cent 

 dead 



1.47 

 2.17 



.86 

 2.39 

 1.46 

 2.44 



.37 

 1.39 

 1.72 

 2.50 



.80 

 1.53 

 1.85 

 2.51 

 2.02 

 2.08 



3, 134 184, 451 



1. 



1.40 

 2.58 

 1.12 

 1.72 

 1.51 

 1.49 



41, 639 



1.74 



226, 090 



1924 



Total 



6,085 



3,480 



16, 642 



1,364 



30, 360 



10, 022 



178 



20,112 



19, 153 



10, 080 



425 



7, 524 



4,205 



1,761 



3,225 



37, 912 



172, 528 



12, 741 

 10, 467 

 1,544 

 297 

 2, 525 

 8,294 



35. 868 



208, 396 



Increase 

 (+) or de- 

 crease (— ) 



+1,390 

 +135 



+2, 339 

 +432 



+7, 766 



+1,644 

 -26 



+2, 333 



+2,416 

 +915 

 -43 

 +227 

 +39 

 -215 

 -446 



-6, 983 



+ 11,923 



+2, 300 

 +867 

 +56 



+78 

 +923 



+1,547 



+5. 771 



+ 17,694 



Per cent' 

 increase! 

 (+) or de- 

 crease (—) 



+22. 84 

 +3.88 

 + 14.05 

 +31.67 

 +25. 58 

 + 16. 40 

 -14.61 

 +11.60 

 + 12.61 

 +9.08 

 -10.12 

 +3.02 

 +.93 

 -12. 21 

 -13.83 

 -18.42 



+6.91 



+18. 05 

 +8.28 

 +3.63 

 +26. 26 

 +36. 55 

 + 18.65 



+16. 09 



+8.49 



The above table credits St. Paul Island with 184,451 pups, an in- 

 crease of 11,923, or 6.91 per cent, over the number in 1924. St. 

 George Island is credited with 41,639 pups, an increase of 5,771, or 

 16.09 per cent, over the number shown in 1924 census. The total 

 number of pups on both islands was 226,090, an increase of 17,694 

 or 8.49 per cent. 



Exceptionally few dead pups were seen during the bull count. 

 In 1922, also, there was a small number of dead pups. It has been 

 assumed that the percentage of dead in 1925 was the same as that 

 in 1922, which would give a total of 3,860 dead pups, or 1.71 per 

 cent, on both islands. 



The number of cows and the number of pups in the herd were iden- 

 tical — 226,090. During the bull count no dead cows were found. 

 No cows bearing the 1902 or 1903 brand were seen. 



MORTALITY OF SEALS AT SEA 



During the last two years, additional information in regard to the 

 loss of seals at sea during their first three years has been secured 

 through branding, and assumed mortality rates have been changed 

 as follows: Males, first year, from 40 per cent to 50 per cent; males, 

 second year, from 17.5 per cent to 25 per cent; males, third year, 

 from 12.5 per cent to 15 per cent; females, first year, from 35 per 

 cent to 45 per cent; females, second year, from 15 per cent to 22.5 

 per cent. 



