COMPUTATION OF FUR SEALS, PRIBILOF ISLANDS, 1926 
By Epwarp C. JOHNSTON 
The numerical strength of the Pribilof Islands fur-seal herd, as of 
August 10, 1926, was computed from an actual count of the harem 
and idle bulls on all the rookeries, made at the height of the breeding 
season, the count of pups on one rookery, and information derived 
from the work of previous years. 
BULLS 
The harem and idle bull count on St. Paul Island was made on 
July 16, 17, and 18, and on St. George Island on July 19 and 20. 
For the first time since 1920 an actual count was made of the bulls 
on Sivutch rookery. In 1925 the number of harem bulls was esti- 
mated at 190. In 1926 there were counted 279 harem bulls. As only 
17 of these were estimated to be 6-year-olds, the 1925 estimate 
probably was too low. 
Number of harem and idle bulls, approximate ratio of idle bulls to harem 
bulls, and average harem, 1926 













| Approx- 
| imate 
ts : Harem Idle | ‘ ratio Average 
Rookery | Date bulls bulls Total eet harem 
harem 
bulls 
St. Paul Island: | 
KGGO Vier se ee een oe July 17 212 37 249 1:6 38. 08 
uk ninye eee se eee epee ie sys 8 2h lee daw = 94 3 | 97 1:31 41.53 
(Gorbatche asst tne lal Sieh ee ieee! ae dor 2 276 31 307 1:9 74. 27 
AT GIguent. = 222 ete. tuo Ee Eee ans doz! 38 3 | 41 1:13 51.03 
DRY ets) Ie Uy el ee eee ef Pease SOhUS o-aey home dos 605 82 687 Le, 68. 06 
SU AU) OVS aS SS eal os les cee Lie feat does 279 34 313 1:8 45.16 
ear OOTeR = Sea ree Ve Be eR ne aihies =O eed Ose Sh] Seaneeall ae Bie ieee es 36. 33 
ALG SEO Ieee eee a AM nan ae ted doze 376 45 421 1:8 64. 47 
ZA pada: 225 lee kee ee Eye ee 2 | July 18 322 23 345 1:14 72. 34 
itthle:Zapadniae sre eee See Bid pe doE seas 185 Zale 202 1:11 64.18 
APSA Celanese ees eee ers ee dow 13> |e ee 13) 22. 89 
PO OWAIN Be 2 le pate eee | July 16 166 27 193 16 50. 43 
1e{o} Vora ateh GH WIS ee et Pile eS a a dons 118 11 129 | LA 38. 84 
Laittlese olovinalses es ee ee Ones 45 10 55 1:5 37.09 
Morovia a Ines a eee endozes 87 4 91 1322 34. 49 
WOStOCHTIt = 2 FS SR aes ree eee nee douse 654 41 695 | 1:16 51. 07 
MGC ss Oo Ae ee Ue LE oe been 2 Be ee 3, 478 368 3, 846 | 1:9 57. 26 
St. George Island: | | 
INGEUNE Saeee eee 2) NOR eee July 19 191 18 209 Lae 85. 05 
STAT ay aAwANUl ss eet 22 sate ne Eee Pevdoas 136 12 148 i517) 90. 00 
APREY ACL TR ee ees eee Ni eee | July 20 42 4 46 | 1:11 41.14 
Sonthesseoss= oe ee eee esa ee £dorsts : T5a|pa-2 22 Re? 15) eee 27. 00 
ASW Ce fae es Ae soe ee July 19 47 4 51 | 1:12 79. 21 
HASTAC iis ee See ie ee wi ON Wl edone ste 125 17 142 | aly 85. 02 
POU a a eee eee ee ns Sop tilt Seen es 556 55 611 1:10 80. 88 
otal (bothislands) 22222322022 ee see 4, 034 423 4, 457 | 1:10 60. 51 






The increase in number of harem bulls on St. Paul Island over 
the 1925 computation was 375, and on St. George Island 133, a total 
of 508. <A total of 414 bulls, estimated 6 years old, was observed 
330 
OO 
f as? 
