CONTENTS -- Continued 



Page 



Weights of bacula and testes of young male seals 29 



Body length and reproductive condition of female seals collected on St. Paul Island 



and at sea in 1968 29 



Body length of male seals, ages 2 to 5 years 30 



Organochlorine pesticides in northern fur seals, California sea lions, and birds, 



1968-69 32 



Summary 33 



Acknowledgments 36 



Glossary 36 



Part II. Pelagic fur seal investigations, 1969 37 



Research in 1969 37 



Distribution 37 



Abundance 37 



Age and sex 38 



Recoveries of marked seals 38 



Lengths and weights 38 



Reproduction 39 



Uterine horn of conception and fetal sex ratio 41 



Feeding habits 41 



Relation of food of fur seals to commercial fisheries 42 



Summary 42 



Literature cited 42 



Appendix A tables 49 



Appendix B tables 73 



Appendix C — Persons engaged in fur seal research in 1969 90 



FIGURES 



1. Location of rookeries and hauling grounds, St. Paul Island 3 



2. Location of rookeries and hauling grounds, St. George Island 4 



3. Three- and four-year-old male seals killed, St. Paul Island, 25 June to 31 July 1969 4 



4. Three- and four-year-old male seals killed, St. George Island, 25 June to 31 July 1969 4 



5. Kill of male seals, by year class, Pribilof Islands, Alaska, 1947-67 6 



6. Number of pups that died of various causes, Reef Rookery study area 1, 1964 and 



1966-69, and Northeast Point study area 3, 19(57-69, St. Paul Island 9 



7. Percentage of pups that died of various causes, Reef Rookery study area 1, 1964 



and 1966-69, and Northeast Point study area 3, 19(57-69, St. Paul Island 10 



8. Correlation of pup deaths from malnutrition with death from malnutrition and 



enteritis, St. Paul Island, 1964 and 1966-69 10 



9. Examples of mark locations that have been used on fur seals, Pribilof Islands, Alaska 11 



10. System of identification symbols used as cryogenic brands applied to 775 pups, St. 



Paul Island, August 1969 12 



11. Percentage recovery of male seals ^ 2 years old tagged on accessible hauling 



grounds, St. Paul Island, June and July 1968-69 28 



12. Weights of bacula, male seals ^ 2 years old, St. Paul Island, 22-26 July 1968. 



Horizontal lines =: mean; black vertical bars mean ±2Sx; open vertical 

 bars == mean ±2S; vertical lines = range; X := outliers. Numbers in paren- 

 theses represent sample sizes 31 



iv 



