These dolphins probably do not mate seasonally, since calves are born at different times throughout the year. However, in a captive population of two females and a male in Switzerland, the male reportedly chased the females in the spring. Though scattered captive populations of Platanista minor exist, little is known about the mating behavior of any of the members of the Platanistidae family.
Platanista minor breeds throughout the year, and has a very long gestation period of 8-11 months. Though not mentioned in the literature, this species probably only gives birth to one offspring at a time since newborns are about a meter long when they are born, which is nearly half the length of an adult female.
Breeding interval: Platanista minor probably does not breed more than once every two years or so due to such long gestation and nursing periods.
Breeding season: Mating occurs throughout the year.
Range gestation period: 8 to 11 months.
Range weaning age: 2 to 12 months.
Average age at sexual or reproductive maturity (female): 10 years.
Range age at sexual or reproductive maturity (male): 10 (low) years.
Key Reproductive Features: iteroparous ; year-round breeding ; gonochoric/gonochoristic/dioecious (sexes separate); viviparous
Little information is available about parental investment in Platanista minor, however, they most likely spend much time and energy on their offspring. Since females are pregnant for up to 11 months, newborns are about half the size of their mothers at birth, calves nurse up to a year after birth, Indus River dolphin offspring are probably very costly.
Parental Investment: pre-fertilization (Provisioning, Protecting: Female); pre-hatching/birth (Provisioning: Female, Protecting: Female); pre-weaning/fledging (Provisioning: Female, Protecting: Female)
- Herman, L. 1980. Cetacean Behavior: Mechanisms and Functions. New York: John Wiley & Sons, Inc..
- Moreno, P. 2004. Ganges and Indus dolphins (Platanistidae). Pp. 13-17 in M Hutchins, D Kleiman, V Geist, M McDade, eds. Grzimek's Animal Life Encyclopedia, Vol. Volume 15: Mammals IV, Second Edition Edition. Detroit: Thompson Gale.