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Fishery Bulletin 103(2) 



naska Islands (P= 0.0050) than it did for pups on Low- 

 rie Island (Table 3). Growth in SL was also faster on 

 Chirikof (P=0. 0383) and Seguam and Yunaska Islands 

 (P=0.0230) than on Fish Island, whereas the increase 

 in SL on Marmot Island did not differ significantly 

 from the other rookeries. The increase in AG was sig- 

 nificantly greater on Seguam and Yunaska Islands 

 (P=0.0021) and Marmot Island (P=0.0364) than on 

 Lowrie Island. There was no significant interaction 

 between rookery and sex in the growth rate of BM, 

 SL, and AG. 



Body mass at birth extrapolated to t = from growth 

 rates did not differ by rookery. There was no significant 

 interaction between rookery and sex, but extrapolated 

 birth mass did differ by sex (P<0.0001). Male pups at all 

 rookeries averaged 22.4 kg (±2.36 SD, rc = 39), whereas 

 female pups averaged 18.7 kg (±2.08 SD, n = 35). These 

 extrapolated birth masses were similar to the average 

 BM measured on the rookery for male (22.6 kg) and 

 female (19.6) pups 1-5 days old. There was no correla- 

 tion between extrapolated birth mass and growth rate 

 (Pearson r=-0.09, P=0.45). 



