The carcasses were found on the beach near Pantha Niwas.
"We suspect that the turtles were killed after being hit by the fishing trawlers in the sea," said Sarat Chandra Behera, an officials of the Puri-Balukhand forest range, adding that the carcasses have been sent for post mortem.
The turtles in large number come to Gahirmatha, mouth of rivers Devi and Rushikulya in Odisha coast, for annual nesting, he said.
Though there is a prohibition on fishing in 20 km distance from the beach in these three identified places, the trawler operators undertake fishing illegally there, Behera said.
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Recently, scores of whales were washed ashore to the Chennai beach. Despite all efforts by fishermen, at least 45 of them died while the rest were rescued and put back in the sea.
Noted sand artist Sudarshan Patnaik, who had created sand sculptors on the beach here, said, "Today, I found hundreds of dead turtles at the beach. I felt sad to see such a huge number of dead turtles".