Page 



FIGURES 



1. Location of rookeries and hauling grounds, St, Paullsland 3 



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



3. Kill of 3- and 4-year-old male seals, by 5-day periods, St. Paul Island, 7 July to 



5 August 1966 4 



4. Kill of 3- and 4-year-old nnale seals, by varying periods, St. George Island, 6 July to 



5 August 1 966 5 



5. Least squares line and 95 percent confidence limits for a connparison of counts of 



dead pups, Pribilof Islands, Alaska, 1953-54 and 1956-66 7 



6. Pup mortality study area. Reef Rookery, St. Paul Island, 11 July 1966 8 



7. Frequency of the primary causes of death among pups. Reef Rookery study area, 



St. Paul Island, 28 June to 22 August 1 966 9 



8. Impaction of the colon with retained meconium in a fur seal pup, St. Paul Island, 



1 July 1966 9 



9. Comparisons of the primary causes of death among pups. Reef Rookery study area, 



St. Paul Island, 1964 and 1966 10 



10. Pup mortality on Reef Rookery study area, and weather on St, Paul Island, 9 July to 



22 August 1964 U 



11. Pup mortality on Reef Rookery study area, and weather on St, Paul Island, 27 June to 



22 August 1966 12 



12. Mean weights of handled and unhandled pups, by sex and rookery, St. Paul Island, 



30 August 1966 14 



13. Examples of mark locations that have been used on fur seals, Pribilof Islands, 



Alaska 14 



14. Body lengths of known-age and selected yearling male seals, St. Paul Island, 1966. . . 15 



15. Measuring a male seal selected as a yearling for tagging, St. Paul Island, 1966 15 



16. Experimental tags used on pups, St. Paul Island, 1964-65: plastic roto (A), small 



cattle ear (B), button ear (C), bird leg band (D), and spaghetti (E) 1£, 



17. Age and body length of 85 territorial male seals, St, Paul Island, 18-23 June 1965, , , 33 



18. Age and body weight of 98 territorial male seals, St, Paul Island, 18-23 June 1965. . . 33 



19. Age and baculum weight of 248 male seals, St. Paullsland, 18 June to 15 July 1965 ... 34 



20. Age, and weight of paired testes of 248 male seals, St. Paul Island, 18 June to 



15 July 1965 34 



21. Weights of baculum and testes of 97 male seals, St. Paul Island, 18-23 June 1965 ... 35 



22. Body length and baculum weight of 85 territorial male seals, St, Paul Island, 18-23 



June 1 965 35 



23. Genital tract of female fur seal showing implantation chamber (IC), right ovary 



(RO), left ovary (LO), and os cervix (OC). Specimen no. 66, 28 November 1965, 



age 17; ventral aspects of freshly thawed tract; scale = 5 cm 3^ 



24. Pup enclosure showing position of sea-water tank, slatboard racks, heat lamps (L), 



and thermometer (T), St, Paul Island, 1965 43 



25. Relation between birthweights and subsequent weights of eight captive pups, by 



formula, St. Paul Island, 1 July to 4 August 1966 45 



26. Best individual growth records of captive pups fed artificial diets during each of 



4 years, St. Paul Island, 1963-66. Average weights of samples of naturally fed 

 rookery pups in 1964 (numerals indicated number of pups weighed) and of one 

 rookery pup in 1963 are shown for comparison. The solid horizontal line indicates 

 100 percent of birthweight 46 



27. Changes in cryogenic brands of the naturally bare flipper skin of fur seal pups, 



Zapadni Reef Rookery, St. Paul Island, 13 July to 23 August 1966 4g 



28. Changes in cryogenic brands of the forearm pelage of fur seal pups, Zapadni Reef 



Rookery, St. Paul Island, 14 July to 14 November 1966 4g 



29. The ocean off central and southern California showing bottom configuration. (Fronn 



USCGS Chart No. 5002.) 55 



30. Number of seals seen per hour of effort, in each square (areal unit) occupied by a 



research vessel in January 1966, off California. The sides of each square 



measure 18.52 km. (10 nautical miles). See table C-1 56 



31. Number of seals seen per hour of effort, in each square (areal unit) occupied by a 



research vessel in February 1966, of California. The sides of each square 



measure 18.52 km. (10 nautical miles). Squares V24-H25 and V23-H22 were 



not occupied. See table C-2 5-7 



