Upen Sardar, who hailed from Gosaba in South 24 Parganas district, was dragged away by a big cat while he was catching crabs at Panchamkhali creek, a forest official said.
As Sardar cried for help, his son and daughter-in-law, ran behind the tiger but it vanished in the nearby mangrove.
There was no trace of Sardar yet, the official added.