ALASKA FISHERY AND FUR-SEAL INDUSTRIES, 1925 



163 



average harem was determined for each rookery and applied to the 

 average harem in 1924. 



Tabulation showing computation of breeding cows 



Rookery 



St. Paul Island: 



Kitovi 



Lukanin 



Gorbatch 



Ardiguen 



Reef 



Sivutcb 



Lagoon 



Tolstoi. - 



Zapadni 



Little Zapadni.. 

 Zapadni Reef... 



Polovina 



Polovina Cliffs. 

 Little Polovina. 



Morjovi 



Vostochni 



Total. 



St. George Island: 



North 



Staraya Artil. 



Zapadni 



South 



East Reef 



East Cliffs.... 



Total 



Total (both islands) . 



Average harem 



1916' 



26.00 

 33.40 

 37.90 

 21.20 

 33. 30 

 31.00 

 29.80 

 33.40 

 31.30 

 35.30 

 33.20 

 29. 30 

 28.50 

 34.60 

 29.10 

 37.30 



31.20 

 39.00 

 31.10 

 6.30 

 21.70 

 36.50 



1922' 



37.56 

 36.92 

 64.46 

 41.83 

 59.89 

 47. 73 

 34. 13 

 53.42 

 52.61 

 52.34 

 29.24 

 50.40 

 38.34 

 35.26 

 38.04 

 46.46 



Average 

 annual 

 increase 



1.93 

 .59 

 4.43 

 3.44 

 4.43 

 2.79 

 .72 

 3.34 

 3.55 

 2.84 

 -.66 

 3.52 

 1.64 

 .11 

 1.49 

 1.53 



78.52 

 85.01 

 42.62 

 58.00 

 48.57 

 68.55 



7.89 

 7.67 

 1.92 

 8.62 

 4.48 

 5.34 



1924 



45.08 

 42.44 

 76.34 

 42.62 

 70.77 

 58.61 

 29.67 

 65.30 

 64.49 

 62.22 

 35.42 

 43.74 

 41.23 

 36.70 

 33.25 

 44.29 



55.17 



47.01 

 43.03 

 80.77 

 46.06 

 75.20 

 61.40 

 30.39 

 68.64 

 68.04 

 65.06 

 34.76 

 47.26 

 42.87 

 36.81 

 34.74 

 45.82 



Harem 

 bulls 



59.44 



100. 32 

 106. 81 

 53.24 

 33.00 

 72.14 

 91.14 



92.21 



59.27 



108. 21 

 114.48 

 55.16 

 41.62 

 76.62 

 96.48 



8.44 



64.12 



159 



84 



235 



39 



507 



190 



5 



327 



317 



169 



11 



164 



99 



42 



80 



675 



Breeding 

 cows 



29 



9 



45 



102 



423 



3,526 



7,475 



3,615 



18, 981 



1,796 



38, 126 



11,666 



152 



22, 445 



21, £69 



10, 995 



382 



7,751 



4,244 



1,546 



2,779 



30, 929 



3,103 | 184,451 



15,041 



11,334 



1,600 



375 



3,448 



9,841 



41,639 



226, 090 



1 Complete pup count made on all rookeries. 



As shown by the above table, the average harem for St. Paul 

 Island was computed to be 59.44, an increase of 4.27; for St. George 

 Island the average harem was 98.44, an increase of 6.23. 



PUPS AND COWS 



As a female seal gives birth to but one pup each year, the number 

 of pups equals the number of cows. In 1925, as in 1923, a pup 

 count was omitted to avoid the great disturbance of rookery life 

 that occurs during the count. The above table shows the method 

 of computing the number of breeding cows and pups. While the 

 numbers computed for the individual rookeries may vary from the 

 numbers actually present, it is believed tha>t the figures for the herd 

 as a whole are fairly accurate. To illustrate: The table below shows 

 an increase in pups on Reef rookery of 25.58 per cent and a decrease 

 on Vostochni rookery of 18.42 per cent. This is due to the increase 

 in the number of harems on Reef and the decrease in the number of 

 harems on Vostochni. It may be that the increase in pups and cows 

 on Reef rookery was not so large nor the decrease so great on 

 Vostochni rookery. 



