 Mating and parturition take place in spring or early summer (April to July) off western and southern Africa, and in winter off India, Alternately, off Oman parturition occurs year-round with a peak in spring.Parturition also occurs continuously in Australian waters; in the Herald Bight of Shark Bay, the number of newborns peaks in April and again in July.One proposed explanation for the lack of reproductive seasonality in these subpopulations is a lengthier and/or more complex reproductive cycle than has been detected (such as a period of dormancy in embryonic development, though there is presently no evidence of this occurring).