Gharial

A 6-Metre Riverine Crocodilian Down to a Handful of Breeding Populations

The gharial is one of three living crocodilian families and one of the most morphologically distinctive: a slender, narrow snout dramatically adapted to catching fish, no comparable adaptation for terrestrial prey, and males that develop a bulbous nasal cartilage (ghara, from Hindi for "pot") at the tip of the snout that gives the species its common name [Whitaker & Basu 1983; Stevenson & Whitaker 2010]. Once distributed across major river systems from the Indus to the Irrawaddy, the gharial is now reduced to fewer than 1,000 adult individuals in the wild, concentrated almost entirely in three Indian river systems and one cross-border Indian–Nepali tributary [Lang et al. 2019; IUCN SSC Crocodile Specialist Group 2019]. The IUCN lists the species as Critically Endangered.

Biology and Identification

Gavialis gangeticus is among the largest extant crocodilians. Adult males commonly reach 3.5–5 metres and have been documented to nearly 6 metres in length; females are smaller, typically reaching 2.5–4 metres [Whitaker & Basu 1983]. Body mass for very large males approaches 250+ kg.

Diagnostic features:

• Snout. Extremely long and narrow, with 27–29 needle-like teeth on each side of each jaw [Whitaker & Basu 1983]. This morphology is specialised for fast lateral sweeps through water to seize fish. The species is essentially incapable of taking large terrestrial prey — the snout would fracture under the stresses of that bite mode.
• Ghara. Sexually mature males develop a hollow cartilaginous nasal protuberance at the tip of the snout. The structure modifies vocalisations during courtship and may serve as a visual sexual signal [Stevenson & Whitaker 2010].
• Locomotion. Gharials are poor terrestrial walkers — adults can drag themselves but cannot lift the body off the substrate for the "high walk" of mugger or saltwater crocodiles. The species spends almost its entire life in water; it leaves the water only to bask and nest.

Reproduction is colonial. Females nest synchronously on sandbanks during the late-dry-season low-water period (March–May in Indian populations). Each female excavates a single nest and lays 30–50 eggs; incubation is approximately 70 days [Stevenson & Whitaker 2010]. Hatchlings emerge en masse and are typically guarded by females communally — gharials are among the more behaviourally complex crocodilians in parental care.

Diet across life-stage: juveniles eat insects and small fish; adults are obligate piscivores. The species is, behaviourally and morphologically, the most fish-specialised crocodilian.

Habitat and Range

The historical range of Gavialis gangeticus covered the major river systems of the Indian subcontinent and adjacent regions: the Indus (Pakistan), the Ganges and its major tributaries (India, Nepal, Bangladesh), the Brahmaputra (India, Bangladesh, Bhutan), and the Mahanadi (India). The species was likely extirpated from the Indus during the 20th century and from the Irrawaddy of Myanmar in roughly the same period [Stevenson & Whitaker 2010].

Current viable wild populations are confined to four sites [Lang et al. 2019]:

1. National Chambal Sanctuary (the Chambal River, India — across Madhya Pradesh, Rajasthan, and Uttar Pradesh): the largest single population, estimated at several hundred adults
2. Katarniaghat Wildlife Sanctuary (Girwa River, India — a tributary of the Karnali/Ghaghara)
3. Son Gharial Sanctuary (Son River, India): small population
4. Chitwan National Park (Rapti and Narayani rivers, Nepal): small but genetically and demographically distinct

Smaller fragments persist in the Brahmaputra and Mahanadi. Reintroduction projects have released captive-bred animals into some historical range sites; survival rates have been mixed [Stevenson & Whitaker 2010].

Conservation Status

The gharial is listed as Critically Endangered on the IUCN Red List [Lang et al. 2019]. It is on CITES Appendix I, prohibiting international commercial trade — though commercial trade is not the primary modern threat. India lists the species under Schedule I of the Wildlife (Protection) Act 1972, the highest level of legal protection. Nepal lists the species as Critically Endangered under national law.

The IUCN's most recent population estimate places the global wild adult count at approximately 650–900 individuals [Lang et al. 2019]. The species is genuinely close to a point where individual mortality events meaningfully affect population viability.

Threats

Sand mining and habitat degradation in river systems. Gharials require clean, free-flowing rivers with sandbank nesting habitat, deep pools, and abundant fish populations. Major threats include:

• Sand mining of nesting sandbanks for the construction industry, particularly intense across the Chambal and Ganges basin [WWF India 2021]
• Dam construction and water diversion for irrigation and hydropower, which reduces dry-season river flows and destroys habitat connectivity. The proposed and constructed Ken-Betwa river-linking projects, and various existing irrigation barrages, have all affected gharial habitat [Lang et al. 2019; Stevenson & Whitaker 2010]
• Water pollution from urban and industrial sources reduces fish populations the gharial depends on. The 2007–08 mass mortality event of approximately 110 gharials in the Chambal River was attributed to renal failure of unclear causation, with environmental toxicant exposure as the most-supported hypothesis [Tripathi et al. 2010]

Fishing pressure and gillnet bycatch. Gillnets set for the riverine fisheries that overlap with gharial habitat regularly drown adult gharials and prevent juveniles from reaching adulthood [Stevenson & Whitaker 2010]. Reducing fishing intensity in critical gharial habitat — particularly during the breeding season — is a key conservation priority.

Direct take. Historical take for skins (the gharial's skin is poorly suited for leather and was less commercially valuable than mugger or saltwater crocodile skins; modern direct take is at lower levels) and for traditional medicine (organs and the ghara are taken for various traditional uses). Egg collection for human consumption persists at smaller scale.

Reduced prey base. Decline of the riverine fish populations on which gharials depend — driven by overfishing, pollution, and habitat fragmentation — affects population recovery prospects.

What Is Being Done

The Gharial Multi-Task Force, coordinated by the Wildlife Institute of India and IUCN SSC Crocodile Specialist Group, is the principal scientific body coordinating gharial conservation across range states.

• National Chambal Sanctuary protection. The Chambal Sanctuary (spanning Madhya Pradesh, Rajasthan, and Uttar Pradesh) is the largest gharial protected area globally. Active management includes anti-poaching patrols, sandbank protection during the nesting season, and community engagement with riverside villages [WWF India 2021].
• Captive breeding and head-starting. Multiple Indian and Nepali facilities — including the Madras Crocodile Bank Trust, Nandankanan Zoological Park, the National Chambal Sanctuary's headquarters facility at Deori, and the Chitwan-based Nepal Conservation Centre — raise hatchlings collected from wild nests to 2–3 year size before release ("head-starting"), bypassing the high natural juvenile mortality. Tens of thousands of gharials have been released through these programs over the past five decades [Stevenson & Whitaker 2010].
• Wildlife Institute of India runs ongoing population monitoring with annual surveys across the Chambal and other sites.
• Madras Crocodile Bank Trust (MCBT), founded by Romulus Whitaker, holds significant captive population and has been a primary research and advocacy institution since the 1970s.
• WWF India runs community-engagement programs in riverside villages, alternative-livelihood support for sand-mining communities, and advocacy against the more damaging proposed water-infrastructure projects.
• Sand-mining enforcement. Indian Supreme Court orders and state-level enforcement actions have curtailed (without eliminating) illegal sand mining in critical gharial habitat. Enforcement remains the binding constraint on this threat.

How Readers Can Help

• Support MCBT and WWF India. The Madras Crocodile Bank Trust is the longest-standing dedicated gharial conservation institution; WWF India's freshwater programs include direct gharial work in the Chambal and Girwa systems.
• Engage on Indian water infrastructure policy. Proposed dam and river-linking projects across the Ganges basin pose long-term gharial habitat threats. Civil-society engagement with the Indian Ministry of Environment, Forest and Climate Change (MoEFCC) Environmental Impact Assessment processes is a meaningful lever.
• Support sustainable fisheries in South Asia. Bycatch reduction in riverine gillnet fisheries is a key conservation priority. National and NGO programs working on alternative gear and fishing-zone management benefit gharials and other freshwater species (the South Asian river dolphin, etc.).
• Travel responsibly to Chambal and Chitwan. Wildlife tourism in the National Chambal Sanctuary and Chitwan National Park supports the political case for sanctuary protection and provides revenue to nearby communities. Choose tour operators with verified MoEFCC permits and clear conservation contributions.
• Donate to the IUCN SSC Crocodile Specialist Group. The group coordinates range-wide scientific work and includes specific gharial-focused projects.

Last verified: 2026-05-23 Conservation status as of writing: Critically Endangered (IUCN Red List 2019 assessment); estimated 650–900 mature wild individuals.

References

• IUCN SSC Crocodile Specialist Group (2019). Gavialis gangeticus. IUCN Red List of Threatened Species. e.T8966A149227430. https://www.iucnredlist.org/species/8966/149227430
• Lang, J., Chowfin, S., & Ross, J. P. (2019). Gharial status review and conservation status. IUCN SSC Crocodile Specialist Group, Gharial Multi-Task Force report.
• Stevenson, C., & Whitaker, R. (2010). Indian Gharial Gavialis gangeticus. In Crocodiles. Status Survey and Conservation Action Plan, 3rd edition, ed. S. C. Manolis & C. Stevenson. Crocodile Specialist Group, Darwin.
• Tripathi, A., Khan, S. A., Singh, A. K., et al. (2010). Causes of mortality of gharials (Gavialis gangeticus) in the National Chambal Sanctuary, India. Journal of Wildlife Diseases 46(2): 538–542.
• Whitaker, R., & Basu, D. (1983). The gharial (Gavialis gangeticus): a review. Journal of the Bombay Natural History Society 79: 531–548.
• WWF India (2021). National Chambal Sanctuary — gharial conservation report. https://www.wwfindia.org/