In Sunday's incident, Melik said the wooden boat, which was carrying at least 70 Rohingya from Ohn Taw Gyi village, left at around 3 a.m. and broke apart about four hours later. Women, children and babies were among those on board.
Family members and friends were scouring the Bay of Bengal and coastlines for survivors, but so far only eight survivors have been found, he said.
It was not immediately clear whether any bodies had been recovered.
Myanmar, a predominantly Buddhist nation of 60 million, has been gripped by sectarian violence in the last 18 months, leaving more than 240 people dead and causing 250,000 to flee from their homes. Most of the victims have been Rohingya, a long persecuted Muslim minority in the country, with Buddhist mobs chasing them down with machetes, iron chains and bamboo clubs.
The U.N. says it expects this year's exodus to be on one of the biggest on record because of the violence.