Irrawaddy dolphin

Orcaella brevirostris

Local name - Iraboti


Irrawaddy dolphins have a blunt head with no visible rostrum. The dorsal fin is small, triangular with a rounded tip. A U-shaped blowhole opens to the front, the opposite of most dolphin species. Adults range from 2.0-2.75 m and length at birth is about one meter. The animal is gray overall with a generally lighter abdomen.

Irrawaddy dolphins generally occur in South and Southeast Asia in pockets of less than 100 individuals. They are adapted to nearshore marine environments with freshwater inputs.

Our research shows that there are more than 5,800 Irrawaddy dolphins in freshwater affected coastal waters and in waterways of the Sundarban mangrove forest of Bangladesh. This means that Bangladesh has the largest Irrawaddy dolphin population in the world.

These dolphins have been documented accidentally caught in fishing nets in almost all areas where they have been studied.