The turtles, weighing 440 quintals, were found stuffed in sacks and lay scattered on the ground inside the compound of the accused's house in Gauriganj town, Special Task Force (STF) spokesman said here, describing it as one of the biggest such recoveries.
He said the gang's kingpin Raj Bahadur Singh was arrested in this connection, while two Indian softshell turtles were also seized from his possession.
During interrogation Singh disclosed that small poachers were involved in catching turtles from Gauriganj, Jagdishpur and Salwan areas and supplying them to organised smugglers.
Singh admitted that he used to collect these animals from smugglers and transport them to Kolkata.
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He also gave certain information about smugglers and poachers in Uttar Pradesh, West Bengal and Odisha reflecting the huge and highly organised smuggling network in the country.
The turtle species is native to South Asia and is found only in India, Pakistan, Bangladesh, Myanmar and Sri Lanka.
In India, it lives in the Gangetic belt all along Uttar Pradesh and Bihar, especially in the Ghagra-Gomti tributaries.
Meanwhile, UP forest department today issued a statewide
alert and has warned that more raids will be conducted in the coming days to crack down on the smuggling of turtles.
UP is home to 14 endangered turtle species of the total 28 found in India. These include the Indian flapshell, softshell, roofed and black turtles.
"There is a belief from Feng Shui traditions that a turtle with all 20 nails -- 5 on each leg -- brings good luck," a senior Wildlife Crime Control Bureau (WCCB) officer said.
Turtles are also believed to be in high demand around the harvest festival of Makar Sakranti and its meat, which is said to be clean white and aromatic, is consumed in eastern and north eastern India.
"Without these turtles, cleaning of Ganga would be even more difficult," said a wildlife activist.
Experts say India ranks among the top five Asian countries for turtle conservation, but nearly 40 per cent of the species are listed as endangered on the International Union for the Conservation of Nature's (IUCN) Red List of Threatened Species.