River Dolphins in India: 6,327 Count, Threats and Project Dolphin
Why in the news
A fresh population study by the Environment Ministry counted 6,327 river dolphins in India. It also reopened the debate on threats and on whether present conservation steps are enough.
Key facts
- Total count: 6,327 river dolphins in India.
- Irrawaddy dolphin (facultative): 155 in Chilka Lake, also in the Sunderbans; numbers are stable there thanks to eco-tourism.
- Indus river dolphin (obligate): Punjab’s State aquatic animal; only 3 sighted in the Beas, while 1,800 survive in Pakistan.
- Yangtze river dolphin: presumed extinct since 2007, a warning for India.
- Ganges river dolphin lives in the Ganges and Brahmaputra systems.
- Legal cover: Wildlife Protection Act (1972).
| Type | Habitat | Examples |
|---|---|---|
| Facultative | Freshwater and marine | Irrawaddy dolphin, Tucuxi (Amazon, Orinoco), Yangtze finless porpoise |
| Obligate | Freshwater only | Ganges, Indus and Yangtze river dolphins |
Adaptations
- Ganges and Indus dolphins live in muddy, low-visibility water and navigate by echolocation (biosonar).
- The melon on the forehead works as a sound lens that focuses ultrasonic waves.
- Eyes are about 1 cm across and have no lens, so they sense only the direction of light; the brain has small visual areas but enlarged hearing regions.
- Chemical and noise pollution can disturb echolocation and endanger them.
Threats
- Habitat loss and pollution: dams such as the Farakka Barrage break up flows and isolate groups; industrial and farm chemicals contaminate rivers.
- Overfishing and bycatch: fewer fish mean less prey; entanglement in nets kills many.
- Poaching: oil and body parts are used in folk remedies for arthritis and muscle strain.
Conservation efforts and gaps
- Project Dolphin (2020): habitat protection and awareness.
- Ganges Dolphin Conservation Action Plan (2010-2020): cut pollution, promote eco-tourism, improve research.
- Protected sites: Vikramshila Gangetic Dolphin Sanctuary (Bihar) and Chambal National Sanctuary (MP, UP, Rajasthan).
- Gaps: weak monitoring with unclear population trends, no new protected zones lately, and lax enforcement against poaching and habitat damage.
Way forward
- More sanctuaries on the Ganges and Brahmaputra and protected zones on the Beas.
- Dolphin-safe fishing gear and seasonal fishing bans in high-risk stretches.
- Less industrial effluent and farm runoff, with stricter wastewater rules.
- Community-led programmes, following the Chilka eco-tourism model.
Exam angle
- Sanctuaries: Vikramshila (Bihar) and Chambal.
- Indus river dolphin is Punjab’s State aquatic animal.
- Launch years: Project Dolphin 2020; action plan 2010.