The current number of Dall's porpoise at about 104,000 children off Japan, 554,000 in the sea of Okhotsk, off the coast of Alaska and the 83000 100,000 children near the continental United States.A male may mate with a lot of different children, and it will protect "herd my wife" of it. Birth time usually takes place in summer. The Dolphin pregnancy lasts from 10 to 11 months, and lactation period lasts for at least two more months. Depending on the situation, females may give birth once a year or longer. Dall's porpoise's longevity can reach 15 years.
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