- A five-year study by researchers
- Sangita Mitra (National Biodiversity Authority, Chennai) and
- Mahua Roy Chowdhury, (a marine biologist Calcutta)
has been published in the Journal of Threatened Taxa.
- The research has found that raising water salinity level is threatening the habitat of Gangetic river dolphins.
- Gangetic Dolphins are the only surviving freshwater dolphin in India.
- Gangetic Dolphins are found in the river systems of Ganga, Brahmaputra, Meghna and Karnaphuli- Sangu in Nepal, India and Bangladesh.
- The IUCN status of the Gangetic Dolphin is Endangered. Gangetic Dolphin is the National Aquatic Animal of India.