Gangetic River Dolphin: Features, Conservation Status and Ecological Significance
Exam Relevance:
UPSC GS-I: River Systems | Distribution of Wildlife
UPSC GS-III: Biodiversity Conservation | Environmental Pollution | Ecosystem Restoration
HPAS GS-III: Environmental Conservation | Aquatic Biodiversity
Why in News?
A recent report titled “Nature’s Comeback: Scaling Ecosystem Restoration for People and Planet” highlighted India’s efforts to recover the Gangetic river dolphin through river ecosystem restoration.
The development draws attention to the relationship between species conservation, cleaner rivers and community livelihoods. UNEP has also recognised the broader Namami Gange initiative as a World Restoration Flagship under the UN Decade on Ecosystem Restoration.
What Is the Gangetic River Dolphin?
The Gangetic river dolphin (Platanista gangetica) is a freshwater aquatic mammal and one of the world’s few river dolphin species.
| Feature | Details |
|---|---|
| Common names | Ganges dolphin, Susu, Hihu and blind dolphin |
| National significance | Declared India’s National Aquatic Animal in 2009 |
| Distribution | River systems of India, Nepal and Bangladesh |
| Major river systems | Ganga–Brahmaputra–Meghna and Karnaphuli–Sangu |
| Diet | Mainly fish and aquatic invertebrates |
Its populations now occupy fragmented stretches of these river systems. In India, important habitats include the Ganga, Brahmaputra and several of their tributaries.
What Are Its Important Features?
- Body structure: It has a long, narrow snout, a stocky body, broad flippers and a relatively small dorsal fin.
- Adaptation to murky water: Its highly developed biosonar system helps it navigate and locate prey where visibility is poor.
- Echolocation: It emits sound pulses and interprets returning echoes to identify objects and prey.
- Respiration: Being a mammal, it breathes air through lungs and must surface periodically.
- Side-swimming behaviour: It often swims on its side while searching for food.
Prelims distinction: A dolphin is a mammal, not a fish. Echolocation uses sound rather than vision to detect the surroundings.
What Is Its Conservation Status?
| Framework | Status |
|---|---|
| IUCN Red List | Endangered |
| Wild Life (Protection) Act, 1972 | Schedule I |
| CITES | Appendix I |
These classifications reflect its conservation priority and the strict protection accorded to it under domestic law and international wildlife-trade controls.
Why Is the Gangetic Dolphin Ecologically Important?
1. Indicator of River Health
Dolphin populations depend on suitable river flows, sufficient prey and functioning aquatic habitats. Their condition can therefore provide insights into the health of river ecosystems.
However, dolphin sightings alone do not prove that river water is pollution-free.
2. Umbrella Species
Protecting dolphin habitats can also benefit fish, turtles, otters and other riverine organisms. Conservation therefore requires protecting the river ecosystem as a whole.
3. Link with Human Well-Being
Healthy rivers support fisheries, drinking-water security and local livelihoods. Dolphin conservation can help connect biodiversity protection with community interests.
What Are the Major Threats?
- Dams and barrages: Fragment habitats and restrict movement between river stretches.
- Water extraction: Reduces river depth and the availability of suitable habitats.
- Pollution: Industrial effluents, sewage and agricultural runoff degrade water quality.
- Fishing-net entanglement: Accidental capture can prevent dolphins from surfacing to breathe.
- Hunting: Dolphins have been targeted for meat and oil.
- Prey depletion: Unsustainable fishing reduces their food supply.
What Conservation Measures Has India Taken?
Project Dolphin
Announced in 2020, Project Dolphin supports dolphin conservation through research, monitoring, habitat protection and stakeholder participation.
Population Assessment
India’s first nationwide riverine dolphin assessment, released in March 2025, estimated 6,327 riverine dolphins. This included 6,324 Gangetic dolphins and three Indus dolphins.
Important: The figure 6,327 refers to both species combined, not exclusively to Gangetic dolphins. A second nationwide estimation exercise was launched in January 2026.
River Restoration and Scientific Monitoring
The Namami Gange programme supports river restoration and aquatic biodiversity conservation. India also undertook the first satellite tagging of a Gangetic dolphin in Assam in December 2024, helping researchers study its movement and habitat use.
What Should Be the Way Forward?
- Maintain adequate environmental flows and protect connected river habitats.
- Strengthen sewage treatment and industrial pollution control.
- Work with fishing communities to reduce accidental entanglement.
- Improve rescue arrangements for dolphins stranded in canals.
- Assess the cumulative impacts of river infrastructure projects.
- Use consistent scientific monitoring to evaluate conservation outcomes.
Prelims Distinction: Gangetic Dolphin vs Indus Dolphin
The Gangetic dolphin (Platanista gangetica) and Indus dolphin (Platanista minor) are recognised as separate species.
HPAS connection: The small dolphin population recorded in the Beas River in Punjab belongs to the Indus dolphin, not the Gangetic dolphin. The Beas originates in Himachal Pradesh, but this does not imply that the recorded dolphin population inhabits its Himachal stretches.
Mains Practice Question:
“Conserving the Gangetic river dolphin requires restoring river ecosystems beyond protecting a single species.” Discuss. (150 words)