Khulna, Aug. 10 -- The Sundarbans, the world's largest mangrove forest known for its unique flora and fauna, is home to some globally endangered species, including the Royal Bengal Tiger and freshwater Ganges and Irrawaddy dolphins.

Overfishing, increasing maritime traffic, poaching and unplanned tourism, among others, are threatening the fragile dolphin population with extinction.

Accidents in Sundarbans rivers, such as the 2014 oil spill, also affect the vulnerable ecosystem and the dolphins.

During a 2001 survey, Wildlife Conservation Society Bangladesh (WCS) found 225 Ganges dolphins in Sundarbans areas with less salinity, according to 'Identifying dolphin hotspot in south-eastern Bangladesh' report. But a survey, conducted between...