| Summary: | 138 harbor seals (Phoca vitulina stejnegeri), 3 larga seals (P. Largha), 1 ringed seal (P. hispida) and 3 undiscriminated seal were measured from 1990 to 2004 in Erimo Cape, Japan. They were captured with dip net or caught in fixed salmon net. Living seals were released after tagging. 4 of 10 pups, which were tagged on Jun in 2004, were caught in fixed salmon net in that autumn. By-catch may be one of serious problem for pups. Sexual dimorphism of harbor seal pups was not recognized statistically. Mean length of one-month-old harbor seal pups in Erimo (male: 96.6 cm, female: 93.3 cm) were shorter than the mean length of harbor seal (P. v. s.) pups in Nemuro, Japan. In autumn, mean length of harbor seal pups in Erimo also shorter than that in Nemro.
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