The mating system of these whales has not been characterized in the literature.
There is not much data available on reproduction in M. carlhubbsi. Birth usually occurs during the summer, after a twelve month gestation. According to Reynolds and Rommel (1999), “The timing of events in the reproductive cycle for all cetaceans is clearly geared to optimize the seasonal changes in environmental conditions to benefit the ecology of the species and favor maximal survival of the young."
The litter size is most likely one offspring per birth in the entire genus Mesoplodon. Young are likely precocial, and able to follow the mother from birth.
There are no data available on the timing of weaning, independence, or reproductive maturity for this species.
Breeding interval: The breeding interval for these whales is unknown, but is certainly no more than once per year.
Breeding season: Breeding probably occurs in the summer.
Average number of offspring: 1.
Average gestation period: 12 months.
Key Reproductive Features: iteroparous ; seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); fertilization (Internal ); viviparous
Young are most likely precocial and able to follow their mother through the water from birth. As in all mammals, the mother provides milk for the developing young, although the period of nursing in this species is not known. It is not known what role males may play in parental care.
Parental Investment: precocial ; pre-fertilization (Provisioning, Protecting: Female); pre-hatching/birth (Provisioning: Female, Protecting: Female); pre-weaning/fledging (Provisioning: Female, Protecting: Female)
- Loughlin, T., C. Johnson, A. Rugh, D. Rugh. 1982. Observations of *Mesoplodon stejnegeri* (Ziphiidae) in the Central Aleutian Islands, Alaska. Journal of Mammalogy, 63: 697-700.
- Nowak, R., J. Paradiso. 1991. Walker's Mammals of the World, 5th Edition. Maryland: The Johns Hopkins University Press.
- Reynolds III, J., S. Rommel. 1999. Biology of Marine Mammals. London: Smithsonian Institution Press.
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