Ganges River Shark: A Critically Endangered Freshwater Predator

The Ganges river shark is one of the world's most endangered elasmobranch species, with very few confirmed individuals remaining. Habitat degradation, bycatch, and overfishing have brought this little-known shark to the edge of extinction.

Key Facts

The Ganges river shark (Glyphis gangeticus) is a true freshwater shark found in the Ganges, Hooghly, and Mahanadi river systems of India.
It is classified as Critically Endangered by the IUCN; fewer than 50 adults are believed to remain in the wild, though survey data is extremely limited.
Unlike bull sharks (which enter freshwater temporarily), the Ganges river shark is a permanent freshwater resident.
The species has small eyes adapted to murky river conditions and relies heavily on electroreception and lateral line sensing to navigate and hunt.
Primary threats include habitat degradation (dam construction, sand mining, river channelisation), extreme pollution of the Ganges, and incidental bycatch in fishing nets.
The Ganges river shark is often confused with the bull shark and with the river shark species Glyphis siamensis; misidentification has hampered conservation efforts.
Almost nothing is known about the species' reproductive biology, prey preferences, or home range — making targeted conservation extremely difficult.
The species is protected under the Indian Wildlife Protection Act, but enforcement in river systems is limited.

Welfare Considerations

The Ganges river shark's extreme rarity means that virtually every individual matters for species survival. Welfare at the individual level — avoiding bycatch suffering, minimising disturbance during any research encounters — is inseparable from conservation. Bycatch in gill nets causes prolonged distress and asphyxiation in air-breathing-limited sharks. Extreme Ganges pollution (industrial effluents, sewage, religious offerings including flowers treated with pesticides) creates a chronically poor habitat for a species already on the edge of extinction. Conservation actions that address the root causes of Ganges degradation benefit this and hundreds of other species. The near-total absence of basic biological knowledge is itself a welfare issue — without understanding this shark's needs, targeted protection is impossible.

What You Can Do

Support the Wildlife Trust of India and IUCN Shark Specialist Group working on Ganges river shark surveys and conservation.
Advocate for stronger enforcement of the Ganges river shark's legal protections under Indian wildlife law.
Contribute to the Namami Gange Programme or similar river clean-up initiatives that reduce industrial and sewage pollution in the Ganges system.
Raise awareness of the Ganges river shark among conservation communities — its extreme rarity is almost unknown to the public.
Support policies reducing dam construction and sand mining in critical river shark habitat.