Table 59. -- 1- 1 in tissues and ingested milk of nursing northern 



al pups, Pnbilof Islands, Alaska, 10 November 1969 



[ND = not detectable; T - trace] 



Tissue and 

 pup number 



Mus 



I 



Residues in ppm . (Mg. /kg. wet 



Ingested t 

 1 



1/ See footnote 1. table 38. 



2/ Tissues only-residues in milk were calculated on a fat 



Of 3,551 marked seals recovered, 2,458 had 

 been given tags or other marks as pups and 

 1,093 had been given tags at age 1 or older 

 on St. Paul and St. George Islands in previous 

 years. An additional 37 marked seals recov- 

 ered had been tagged by Soviet biologists on 

 Robben and the Commander Islands. 



Tag loss varies with the quality and appli- 

 cation of tags, and differences in the ages of 

 seals tagged. 



The cattle-ear tag is unsuitable for marking 

 fur seals but data on the relative effectiveness 

 of tags and marks made by removing part of 

 a flipper are inconclusive. 



On the basis of recoveries of tagged seals, 

 an estimated 461,000 pups were born on the 

 Pribilof Islands in 1966. Shearing and sam- 

 pling of pups yielded an estimate of 390,000 

 for the 1966 year class and 303,500 for the 1969 

 year class. 



The forecasted kill of males on the Pribilof 

 Islands in 1970 includes 4,400 of ages 2 and 5, 

 34,800 of age 3, and 14,500 of age 4. 



The predicted kill of males on the Pribilof 

 Islands in 1969 included 4,200 of ages 2 and 5, 



Table 40. --Parts per million (mg. /kg. ) of pesticides— 'in tissues of California sea lions 



Age _>3 females 



U See footnote 1, table 38. 



2/ These animals contained detectable amounts of a polychlorinated biphenyl compound. 



3/ Pups were approximately 2 months old. 



35 



