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New Zealand fur seals (Arctocephalus forsteri) are common in the Australian-New Zealand region, but vital\uddemographic data are lacking. Accurate determination of the age of individuals is critical to the study of agespecific\udlife-history parameters. A cross-sectional sample of female and male New Zealand fur seals was caught\udand animals were individually marked on Kangaroo Island, South Australia, between 2000 and 2003. Seals were\udaged through examination of a postcanine tooth, which was removed from each animal. Annual formation of\udcementum layers was confirmed and accuracy in age estimation was determined by examination of teeth removed\udfrom individuals of known age. Indirect methods of assessing reproductive maturity based on characteristics of\udmammary teats indicated that females 1st gave birth between 4 and 8 years of age, with an average age at reproductive\udmaturity (ARM) of 5 years. No females were observed to breed beyond 22 years. Age of 1st territory\udtenure in males ranged from 8 to 10 years. Variation in ARM between individuals appears to be related in part to\udbody size and condition. Classification of mammary teat status in combination with techniques for aging live\udanimals provided a means of assessing ARM in the absence of extensive longitudinal data

Age and Reproductive Maturity of New Zealand Fur Seals (Arctocephalus forsteri) in Southern Australia