A turtle with a satellite transmitter installed on its shell has been found in Satkhhira's Tala upazila on Monday.
East Sundarbans divisional forest official Saidul Islam said a turtle breeding ground had been set up at Karamjal wild animal breeding centre.
As part of a research on endangered turtle species Batagurbaska, satellite transmitters were installed on two turtles.
They were later released in the Bay of Bengal on 12 February.
However, one of the turtles was untraceable recently.
Sheikh Wahab Uddin of Dohar village found the turtle on Monday at Pakhimara Bil (Reservoir) when he was catching fish. The fish traders refused to buy the turtle as they saw a device on the shell of the turtle.
Local people told him that the turtle might have been used for research.
Then he brought it back home and later handed it over to police.
Tala police officer-in-charge Hasan Hafizur Rahaman said the turtle has been handed over to wild animal management and nature reservation ranger of wildlife project Lutfar Rahman and wild animal management and nature reservation official Azedul Hasan.
Lutfar Rahman said the turtle will be released in the river of Sundarbans after experts run a few lab tests on it.