Abstract
Concentrations of PCBs and DDE in the blubber of Baird's beaked whales collected from the Pacific coast of Japan are reported. Comparison of the values of PCB/DDE ratios with those of other cetaceans from the Japanese coastal waters and open ocean areas of North Pacific indicates that these animals may not have any offshore distribution, as doubted by some biologists. The extent of the male-female differences in the levels of PCBs and DDE in the adults of this species is narrower than minke whale, Dall's porpoise and striped dolphin. Based on these values it is suggested that the lactational period for every parturition in Baird's beaked whales may be shorter than those of the other three species, i.e. less than 6 months.
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