An FIR has been lodged against them and they are being questioned, sources in the Andaman and Nicobar administration said.
One person was still missing while all the bodies had been identified and sent back to Chennai and other places where the victims hailed from, the sources said.
21 persons died and 29 were rescued in the boat tragedy.
Of the dead, three hailed from Maharashtra, 16 from Tamil Nadu and one each from West Bengal and Uttar Pradesh.