Experts said the survey during monsoon registered maximum sightings of dolphins in river Yamuna between Panchnada in Etawah upto Sangam in Allahabad, approximately 400 kms stretch out of the total course of the river.
Environmentalists are worried over the rampant use of dredgers by the district irrigation department, which has led to acute water scarcity in the river, posing serious threat to aquatic animals, particularly the Gangetic Dolphin.
The population of the endangered Gangetic Dolphin in India today is only about 2,000 individuals spread over the rivers of the Gangetic basin and the Brahmaputra river system.
Gangetic dolphins, India's national aquatic animal, are killed at an alarming rate by poachers for their flesh as well as oil, which is used as an ointment and considered an aphrodisiac. Their carcasses are regularly found on the river banks.
The Gangetic river dolphin is one of the four freshwater dolphin species in the world. The other three are found in the Yangtze river in China, the Indus river in Pakistan and the Amazon river in South America.
The mammal is covered under the Schedule I of the Indian Wildlife (Protection) Act and has been declared an endangered species by the International Union for Conservation of Nature (IUCN).
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