Counting River Dolphins: India’s Second Nationwide Survey and Project Dolphin

Why in News?

India has launched its second nationwide riverine and estuarine dolphin survey, extending the methodology of the first comprehensive count completed in 2024. The exercise is coordinated by the Wildlife Institute of India (WII), Dehradun, under the umbrella of Project Dolphin and the National Mission for Clean Ganga.

The first survey put the population at about 6,327 river dolphins across the Ganga, Brahmaputra and their tributaries plus the Beas, establishing the first scientific baseline for the species and turning a once-data-poor animal into a measurable indicator of river health.

• Second cycle builds on the 2024 baseline of ~6,327 dolphins, the country’s first systematic estimate.
• Survey spans the Ganga and Brahmaputra basins across eight states, plus the lone Indus dolphin population in the Beas, Punjab.
• Run under Project Dolphin (announced 2020) with the Wildlife Institute of India as the technical lead.
• Uses standardised boat-based double-observer counts and emerging environmental DNA (eDNA) and acoustic methods.
• Feeds directly into the Namami Gange programme’s river-rejuvenation targets.

The development matters in the context of:

• The Gangetic dolphin is India’s National Aquatic Animal, notified in 2009, making its numbers a flagship measure of conservation success.
• As an apex predator and an indicator species, healthy dolphin counts signal a living, connected river; declines flag pollution, flow loss and overfishing.

UPSC Relevance

Prelims Relevance

• Gangetic dolphin (Platanista gangetica) — India’s National Aquatic Animal (declared 2009).
• Project Dolphin launched 2020; nodal agency MoEFCC, technical lead Wildlife Institute of India.
• First nationwide count (2024) estimated ~6,327 river dolphins.
• Listed in Schedule I of the Wildlife (Protection) Act, 1972 — highest protection.
• IUCN Red List: Endangered; listed on CMS Appendix I and II and CITES Appendix I.
• Two subspecies: the Ganges river dolphin and the Indus river dolphin (bhulan), in the Beas, Punjab.
• Dolphins are functionally blind; they navigate and hunt by echolocation.
• Vikramshila Gangetic Dolphin Sanctuary (Bihar) is India’s only protected stretch dedicated to the species.
• National Ganga River Dolphin Day is observed on 5 October.

Mains Relevance

GS Paper 3

• Conservation of indicator and flagship species and the case for ecosystem-level river management.
• Balancing river infrastructure (dams, barrages, waterways) with aquatic-biodiversity protection.

GS Paper 2

• Government interventions (Project Dolphin, Namami Gange) and the role of specialised institutions like WII in evidence-based policy.

Essay

• What a river’s last sentinel tells us about our development model.
• Counting what we cannot afford to lose: data, conservation and the public good.

Background and Context

The species: a blind river sentinel

The Gangetic dolphin is uniquely adapted to murky, sediment-heavy rivers, which makes it both fascinating and fragile.

• Platanista gangetica is a freshwater cetacean found only in the Ganga, Brahmaputra and Meghna river systems across India, Nepal and Bangladesh (see our explainer on the river dolphins of India).
• It is effectively blind — its eyes lack a lens — and relies entirely on echolocation to navigate turbid water.
• It surfaces every few minutes to breathe, producing the characteristic exhalation that earns it the local name susu.
• Females are larger than males; the species breeds slowly, giving birth typically to a single calf every two to three years, which limits recovery speed.
• It sits at the top of the aquatic food chain, so its presence reflects abundant fish and a functioning river ecosystem.

Project Dolphin and the institutional architecture

The survey is the data backbone of a structured national programme rather than a one-off count.

• Project Dolphin was announced by the Prime Minister on 15 August 2020 and approved to conserve both riverine and oceanic dolphins.
• It is anchored in the Ministry of Environment, Forest and Climate Change (MoEFCC) and draws on the National Mission for Clean Ganga (NMCG).
• The Wildlife Institute of India (WII), an autonomous body under MoEFCC, provides the scientific design, training and population modelling.
• It mirrors the model of Project Tiger and Project Elephant — using a charismatic flagship to drive habitat-wide protection.
• Conservation funds also flow through the dedicated National Dolphin Research Centre (NDRC) at Patna, India’s first such facility.

How the count is done

Counting a fast, blink-and-miss animal in opaque water demands a careful, repeatable method.

• Surveyors use boat-based double-observer protocols, where two independent teams log sightings to correct for animals missed at the surface.
• Distance and GPS data feed statistical abundance models, producing population estimates with confidence bands rather than raw tallies.
• Newer cycles supplement visual counts with environmental DNA (eDNA) from water samples and passive acoustic monitoring of echolocation clicks.
• Standardising the method across the first and second surveys is what makes a trend — not just a snapshot — possible.
• Building local capacity is explicit: forest staff and researchers are trained so monitoring continues beyond the survey window.

The threats the numbers track

The pressures on the dolphin are the same pressures degrading India’s rivers, which is precisely why it works as an indicator.

• Accidental bycatch in fishing nets is the leading cause of death; dolphins drown when entangled.
• Dams and barrages fragment populations into isolated stretches, blocking movement and shrinking the gene pool.
• Reduced dry-season flow from abstraction for irrigation and water supply strands dolphins in shallow pools.
• Industrial and agricultural pollution — including heavy metals and pesticides — accumulates up the food chain in this apex predator.
• Underwater noise from vessels and dredging for inland waterways can disrupt the echolocation the animal depends on.
• Historic poaching for dolphin oil, used as fish bait, once drove sharp local declines.

Indus versus Gangetic: two cousins, two fates

India hosts both surviving South Asian river dolphin subspecies, and their contrasting status is itself a lesson.

• The Ganges river dolphin ranges widely across the Ganga-Brahmaputra system and holds the larger global population.
• The Indus river dolphin (bhulan) survives in India only in a short stretch of the Beas river in Punjab, with the bulk of its range in Pakistan.
• The Beas population is protected within the Beas Conservation Reserve, a transboundary conservation interest.
• Both were long treated as one species but are now recognised as distinct subspecies, sharpening the case for managing each population separately.
• The Indus dolphin’s near-extinction in fragmented canals is a cautionary preview of what unchecked barrages can do to the Gangetic stock.

Why an indicator species matters for policy

Conserving the dolphin is shorthand for conserving the whole river, which is the survey’s deeper value.

• An indicator species is one whose condition reveals the health of its wider ecosystem, much like a canary in a coal mine.
• Because the dolphin needs deep, connected, fish-rich water, a stable count certifies that Namami Gange rejuvenation is working on the ground.
• Tracking the same metric over time gives policymakers a measurable outcome, not just spending or activity reports.
• Protecting the dolphin’s habitat simultaneously secures fisheries, water quality and livelihoods for riverine communities.
• It anchors India’s commitments under the Convention on Migratory Species (CMS) and broader biodiversity goals.

Way Forward

Make monitoring continuous

• Move from periodic surveys to year-round monitoring using eDNA, acoustic sensors and trained local teams.
• Maintain a shared open database so trends, not isolated counts, drive decisions.

Fix the river, not just the dolphin

• Guarantee environmental flows (e-flows) below barrages so dolphin stretches never run dry.
• Mandate dolphin-safe fishing gear and net-free zones in core habitats, with compensation for affected fishers.

Engage communities and link missions

• Build community stewardship through eco-tourism and local ‘dolphin mitra’ volunteers.
• Tightly couple Project Dolphin targets with Namami Gange pollution-abatement milestones.

Conclusion

The second nationwide survey turns the river dolphin from a symbol into a yardstick. By repeating a standardised count, India can finally say whether its rivers are recovering or simply being managed on paper.

If the dolphin thrives, the Ganga and Brahmaputra are alive in the fullest sense — clean, flowing and fish-rich. Protecting this blind sentinel is, in the end, the most honest test of whether river-rejuvenation promises are being kept.

UPSC Practice Questions

Prelims MCQ 1

With reference to the Gangetic river dolphin, consider the following statements:

1. It is designated as India’s National Aquatic Animal.
2. It is listed in Schedule I of the Wildlife (Protection) Act, 1972.
3. It primarily uses keen eyesight to hunt in clear waters.

How many of the above statements are correct?

(a) Only one (b) Only two (c) All three (d) None

Answer: (b) Only two

Explanation:

Statements 1 and 2 are correct — it was declared the National Aquatic Animal in 2009 and enjoys Schedule I protection. Statement 3 is wrong: the dolphin is effectively blind and hunts by echolocation in turbid water.

Prelims MCQ 2

Project Dolphin, launched in 2020, is implemented under the overall charge of which of the following?

(a) Ministry of Jal Shakti only (b) Ministry of Environment, Forest and Climate Change (c) Department of Fisheries (d) Indian Council of Agricultural Research

Answer: (b) Ministry of Environment, Forest and Climate Change

Explanation:

Project Dolphin is anchored in the MoEFCC, with the Wildlife Institute of India as technical lead, and draws on the National Mission for Clean Ganga under Jal Shakti for the Ganga component.

UPSC Mains Questions

1. Indicator species can convert abstract conservation goals into measurable outcomes. Examine this proposition with reference to the Gangetic river dolphin and India’s river-rejuvenation programmes. (250 words)
2. Riverine infrastructure such as dams, barrages and inland waterways often conflicts with aquatic biodiversity. Discuss the threats this poses to river dolphins and suggest a framework to reconcile the two. (250 words)
3. What is Project Dolphin? Evaluate how a flagship-species approach, on the lines of Project Tiger, can strengthen ecosystem-wide conservation in India. (150 words)

Sources: Ministry of Environment, Forest and Climate Change (MoEFCC) and Wildlife Institute of India.

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