You can read more about the turtles in Tripureswari Temple here in the Hindu
The fifteenth century temple constructed by King Dhanyamanikya in
Udaipur, 55 km from Agartala, is believed to be one of the holiest Hindu shrines in the country.
The rare species of Bostami turtles inhabit the Kalyan Sagar lying in the eastern side of the temple.
Spread over 6.4 acres, it was a natural habitat of the turtles. They come up to the shore looking for crumbs that visitors buy at the nearby stalls and feed to these reptiles, as part of the rituals.