Orcaella brevirostris 

Adult weight exceeds 130 kg (287 lb) kg and length is 2.3 m (8 ft) m at full maturity. Maximum recorded length is 2.75 m (9 ft) of a male from Thailand.

Irrawaddy dolphins prefer coastal areas associated with the muddy, brackish waters at river mouths, ranging offshore as far as the extent of the freshwater plume

Upperside of body dark-grey. Head is compact and round, with no beak. Large melon. Like a Beluga, this species head and neck can move freely as only two vertebrae are fused. Very small dorsal fin, almost triangular, with rounded tips and located far down the back.

These Dolphins are thought to reach sexual maturity at 7 to 9 yrs. In the Northern Hemisphere, mating is reported from December to June. Its gestation period is 14 months, giving birth to a single calf every 2 to 3 years. Length is about 1 m (3 ft)1 m at birth. Birth weight is about 10 kg (22 lb) kg. Weaning is after two years. Lifespan is about 30 years.
This Dolphins feeds Benthic fish, cephalopods and crustaceans. Occasionally drives schools fish into shallows in order to facilitate capture

RALF KIEFNER, WHALES & DOLPHINS CETACEAN WORLD GUIDE, PUBLISHED BY IKAN, Page: 240

 

http://www.iucnredlist.org/details/11140
http://en.wikipedia.org/wiki/Lagenodelphis