The victim was identified as Boonraeng Mahayos, 42, a resident of Moo 8 village in Tambon Dong Suwan.
Police were alerted of the death at 9am after the man’s body was seen floating face down in the middle of the pond.
Witnesses said Boonraeng had been collecting oysters in the pond from the morning, and police believe he may have fainted from the heat and drowned as a result.
The body was sent for an autopsy at the Dok Kham Tai Hospital.