29,500 of age 3, and 22,500 of age 4. Actual 

 kills were 5,200 of ages 2 and 5, 20,471 of age 3, 

 and 12,769 of age 4. 



Of 334 2-year-old males tagged on St. Paul 

 Island in 1968, 67.7 percent were recovered in 

 1968 and 12.8 percent were recovered in 1969; 

 68.5 percent of 555 males tagged in 1969 were 

 recovered in that year. 



In a preliminary experiment in telemetry, 

 11 radio transmitters were attached to young 

 males on St. Paul Island in 1969. The results 

 were not encouraging. 



Weights of the bacula of young males ranged 

 from 3 to 11 dg. at age 2 to 13 to 45 dg. at age 5. 



Weights of the testes of young males ranged 

 from 9 to 18 g. at age 2 to 23 to 99 g. at age 5. 



The body lengths and reproductive conditions 

 of females collected on St. Paul Island and at 

 sea in 1968 were compared for studies of physi- 

 ological differences; however, the pelagic sam- 

 ple was too small to permit valid conclusions. 



The mean body length of most 2- to 5-year- 

 old males increased from 1964 to 1968 but de- 

 creased in 1969. 



Organochlorine pesticides were found in the 

 body tissues of fur seals and marine birds 

 collected on St. Paul Island and of sea lions 

 on San Miguel Island, Calif. 



ACKNOWLEDGMENTS 



The research in 1968 was completed with 

 the cooperation of William L. Peck, Program 

 Director; Roy D. Hurd and Bertel W. Johnson, 

 Management Staff Officers; Richard A. Hajny, 

 Wildlife Management Biologist; Harold A. 

 Thayer, Program Construction Supervisor; 

 Victor Misiken, Village Foreman ; Alex Melov- 

 idov, Sealer Foreman; and Lee Paola, Superin- 

 tendent, Oregon-Alaska Marine Products. 



GLOSSARY 



The following terms used in fur seal research 

 and management on the Pribilof Islands have 

 special meanings or are not readily found in 

 standard dictionaries. 

 Checkmark A notch, slit, hole, or other mark 



made on a seal nipper when a tag is applied, 



to ensure later recognition of an animal that 

 has lost its tag. See mark and lost tag. 

 Drive The act of surrounding and moving 

 groups of seals on land from one location to 

 another. 



Escapement Seals that were not killed be- 

 cause they were too old or too large for the 

 market, or were not available. 



Flipper Mark See mark. 



Hauling Ground Usually near a rookery, 

 where nonbreeding seals congregate. See 

 rookery. 



Haul Out The act of seals moving from the 

 sea to a rookery or hauling ground on shore. 



Known-age Refers to a seal whose age is 

 known because the animal bears an inscribed 

 tag or has a certain combination of tag-scar 

 and checkmark. 



Lost-tag Refers to a seal known to have been 

 tagged as a pup because it bears a checkmark. 



Male Seals, Adult Class 1 Shoreline — 

 Full-grown males about age 10 and older 

 without females but apparently with estab- 

 lished territories at the high-tide mark. 

 Class 2 Territorial without females — Full- 

 grown males about age 10 and older without 

 females but with established territories on 

 the rookery. 



Class 3 Territorial with females — Full- 

 grown males about age 10 and older with 

 females and established territories on the 

 rookery. 



Class 4 Back fringe — Full-grown and partly 

 grown males about age 7 and older without 

 females and territories that are along the in- 

 land fringe of the rookery. 

 Class 5 Hauling ground — Full-grown and 

 partly grown males about age 7 and older 

 without females that are on traditional haul- 

 ing grounds. 



Mane Long, silver-colored guard hairs on 

 the shoulders and on back of the neck — a 

 secondary sex characteristic of males. The 

 mane appears on some males at age 5, on 

 most at age 6, and on all at age 7. 



Mark Examples of marks are a tag, the tip 

 of a digit from a hind flipper removed, a V- 

 notch cut into the leading edge of a front 

 flipper near the tip, or the tip of a front 

 flipper sliced off. When applied to seals in 



36 



