152 



U. S. BUREAU OF FISHERIES 



Marking of S-year-old male seals for breeding reserve, Pribilof Islands, 1927 



ST. PAUL ISLAND 



ST. GEORGE ISLAND 



June 24 



July 4 



13 



22 



Zapadni. 

 do__. 



.do. 



.do. 



25 East Reef and East Cliffs. 



Staraya Artil 

 North 



Total.. 



413. 

 397 



2,24a 



COMPUTATION OF HERD 



In 1927 a very satisfactory increase was shown in the size of the 

 Pribilof Islands herd. As of August 10, after the close of the regular 

 seaUng season, it contained over 800,000 animals. The increase over 

 the corresponding date of the preceding year was close to 50,000, or 

 6.25 per cent. The computation was made by Edward C. Johnston, 

 who had had immediate charge of this work in the preceding six 

 years. His report for 1927 will be found on pages 166 to 171 of this 

 document. Following is a comparative statement of the numerical 

 strength of the various elements of the seal herd in the years 1916 to 

 1927, inclusive: 



General compai-ison of computations of the seal herd on the Pribilof Islands, 1916 



to 1927 



Classes 



1916 



Harem bulls 



Breeding cows.. 



Surplus bulls 



Idle bulls 



6-year-old males. 

 5-year-old males. 

 4-year-old males. 

 3-year-old males. 

 2-year-old males. 

 Yearling males.. 

 2-year-old cows.. 

 Yearling cows... 

 Pups 



Total 



3,500 

 116,977 



2,632 

 11,167 

 15, 494 

 15, 427 

 19,402 

 24, 169 

 33, 645 

 24, 245 

 33,640 

 116,977 



417. 281 



1917 



1918 



4,850 



128, 024 



8,977 



2,706 



15, 397 

 14, 813 



16, 631 

 19, 507 

 26, 815 

 38, 013 

 26,917 

 38, 018 



128, 024 



5,344 

 142, 915 

 17, 110 



2, 444 

 13, 755 

 11,941 



7,114 



9,117 

 30, 159 

 41, 595 

 30, 415 

 41, 608 

 142, 915 



468,692 496,432 



1919 



5,158 



157, 172 



9,619 



2,239 



8,991 



5,282 



5,747 



13, 596 



33, 081 



46,444 



33, 287 



46, 447 



157, 172 



524, 235 



1920 I 1921 



4,066 



167, 527 



6,115 



1,161 



4, 153 



5, 007 



5,667 



10, 749 



39,111 



51,074 



39, 480 



51,081 



167, 527 



552, 718 



3,909 



1/6,655 



3,301 



747 



3,991 



4, 729 



6,780 



14, 668 



41,893 



50, 249 



43,419 



54, 447 



176,655 



581,443 



Classes 



1922 



1923 



1924 



1925 



1926 



1927 



Harem bulls 



Breeding cows.. 



Surplus bulls 



Idle bulls.. 



6-year-old males. 

 5-year-old males. 

 4-year-old males. 

 3-year-old males. 

 2-year-old males. 

 Yearling males.. 

 2-year-old cows.. 

 Yearling cows... 

 Pups 



Total 



3,562 



185, 914 



2,346 



508 



3,771 



6,080 



11,807 



7,459 



40, 920 



52, 988 



46, 280 



57,413 



185, 914 



3,412 



197, 659 



1,891 



312 



4,863 



10,612 



5,710 



22, 786 



43, 112 



55, 769 



48, 801 



60, 422 



197, 659 



604, 962 



653, 008 



3,516 



208, 396 



2,043 



390 



8,489 



5,132 



18, 670 



21,551 



45, 685 



59, 291 



51, 359 



64,240 



208, 396 



3, 526 



226, 090 



3,558 



311 



4,105 



16, 792 



18, 692 



21, 185 



43, 515 



52, 091 



49, 786 



57, 309 



226, 090 



4,034 



244,114 



2,002 



423 



13, 434 



16,812 



17, 872 



17, 189 



38, 183 



56, 514 



44,415 



62, 175 



214, 1 14 



4,643 



263, 566 



4,827 



972 



13,450 



16, 073 



14, 448 



9,730 



41, 252 



61,026 



48, 186 



67, 131 



263, 566 



697, 158 



723, 050 



761, 281 



808, 870' 



