ALASKA FISHERY AND FUR-SEAL INDUSTRIES 181 
Computation of breeding cows, based on annual increase of 8 percent, and of average 
harem, in 1989 












Breeding cows Average harem 
Harem 
Rookery bulls, Ce 
1938 1939 1939 | 1938 | 1939 | crease (—) 
in 1939 
from 1938 
St. Paul Island: 
RO) ple Se ee ee eee ee 20, 330 21, 956 458 49.11 47.94 —1.17 
Ur Ligation eee 9, 829 10, 615 166 53. 71 63. 95 +10. 24 
COiay do ire Na oes ee ee eee 51, 620 55, 750 900 49.16 61. 94 +12. 78 
LAr bien Sees Cee toe Oe ee , 883 5, 274 103 50. 86 51. 20 34 
Ga eek Oe See eee ee ee ee 103, 688 111, 983 1, 600 49. 38 69. 99 +20. 61 
SU ADURG 0 US 5 ae ares or ge Re OL 2 31, 72! 34, 267 400 66. 80 85. 67 +18. 87 
Lagoon (actual count pups)_--_--_-_----_- 53 32 1{ 26.50 | 32.00 +5. 50 
RTS} tg) Pees a a eee 61, 037 65, 920 975 50. 86 67. 61 +16. 75 
Yast Vebabls Oe 22 eae ea ee 58, 659 63, 352 786 | 58.66] 80.60 +21. 94 
Mittlow vad 2228 eis 2. ay ew 29, 901 32, 293 482 51. 91 67. 00 +15. 09 
Zanadniy Reet =a Sats ee sariks wear 2! 1, 037 1, 120 76 15. 03 14. 74 —.29 
Lee ona beth ee Cae Oe em ERY ee eae 21, 082 22, 769 420 45. 44 54, 21 +8. 77 
PalowinayGlitiss +s sre wee Sie 11, 543 12, 466 355 31. 28 35. 12 +3. 84 
nathle se plovine 2822 2 ee pe 2 4, 203 4, 539 165 35. 03 27. 51 Soo 
EO TIO Vis Sa fot eta oh i ns 7, 556 8, 160 435 | 25.02 18. 76 —6. 26 
NWOSLOCIIeansne eee ein eee a 84, 114 90,843 | 1,800 | 36.57] 650.47 +13. 90 
Way Re ES SL ea Ae gees Oo 501, 264 541, 339 9, 122 46. 76 59. 34 +12. 58 
St. George Island: 
OU Eee eee wipes te) ds Way eS 40, 907 44, 180 640 51.13 69. 03 +17. 90 
Stara yar tie 22 srs 6 eo ee ee 30, 822 33, 288 534 47.42 | 62.34 +14. 92 
ASO G he Me TEES Le ee eee ee ee eee 4, 349 4, 697 212 18.91 22. 16 +3. 25 
Sit Seeeee Bee os es ow eee ae 1,021 1, 103 139 6. 81 7. 94 +1. 13 
NERSUS Ey PE UG fire ne Se ly co nt es on 9, 373 10, 123 102 50. 66 99. 24 +48. 58 
LTR CLINE LES SEES ee ee eee 26, 763 28, 904 231 62.97 | 125.13 +62. 16 
A NOV (G Ls prea een Bae 9 Soe eaten See aes at 113, 235 122, 295 1, 858 46. 41 65. 82 +19. 41 
Total (bothislands)===— eyes at 2 es 614, 499 663, 634 | 10, 980 46. 69 60. 44 +138. 75 
PUPS AND COWS 
The estimated number of pups and cows is determined by applying 
an increase of 8 percent to the number computed for the previous 
season. 
It is now believed that the estimated rate of increase is slightly too 
high. The killings of 3-year-old males during the past few years have 
indicated that the applied percentage of increase was somewhat too 
high, but, on the other hand, it may be that a larger death rate should 
be applied for a portion or all of the first 3 years of the life cycle. 
The final results would be the same. One hesitates about making 
changes until observations make it entirely essential. The increase 
in killable animals this season might indicate the beginning of another 
cycle wherein there may be a smaller mortality rate than has been 
apparent for the past few years. 
There did not appear to be any increase in the percentage of dead 
pups, and the percentage determined in 1922 has therefore been applied 
to each rookery. The estimated number of dead pups has been in- 
cluded, as usual, in the total number of pups for comparative purposes. 
Inasmuch as the estimated number of dead pups has now reached a 
grand total of 11,333, and has been around the 10,000 mark for several 
years, it is quite evident that total census figures are somewhat higher 
than they should be, even though the discrepancy is proportionately 
no greater than it has been in the past. 
