TABLE 4-1. — Increases in mean weights of pups in September and October, 



St. Paul Island, 1962 



2-3 September to 2-3 October 



2-3 October to 24-25 October 



NEP 

 REEF 

 ZAP 

 POL 



Combined 

 rookeries 



2.56 

 0.97 

 0.90 

 0.70 



1.27 



50 

 34 

 20 

 20 



31 



1.71 

 0.11 

 1.84 

 0.41 



1.02 



40 



4 



38 



12 



27 



2.28 

 0.82 

 1.85 

 1.33 



1.56 



55 

 27 

 35 

 38 



39 



2.02 

 0.27 

 2.57 

 0.40 



1.32 



45 

 10 

 54 



16 



36 



2-3 September to 24-25 October 



Weight gains of individual animals were 

 determined from 121 tagged pups weighed more 

 than once. Of 22 pups weighed at the first and 

 second weighing, 17 had gained an average of 

 2.44 kilograms and 5 had lost an average of 

 0.80 kilograms. Twenty-eight of forty-six 

 animals weighed during both the second and 

 third weighings had gained an average of 2,23 

 kilograms, 17 had lost an average of 1.38 

 kilograms and 1 had remained the same. 



Fifty-three pups were weighed during both 

 the first and third weighings. Of these, 51 

 gained an average of 3.26 kilograms, 1 lost 

 1.0 kilograms, and 1 remained the same. 



Results of the pup-weighing program show 

 that tagging causes an immediate weight loss 

 and that the loss is at least partially overcome 

 2 months after tagging. There is a tendency 

 for the rate of gain in weight to decrease 



49 



