More than 3,500 migrants have swum to shore or been rescued off the coasts of Malaysia, Indonesia, Thailand and Bangladesh since a Thai crackdown on human-trafficking in early May threw the illicit trade into chaos.
Speaking to The Weekend Australian newspaper, Bishop said Indonesia estimated that only 30 to 40 per cent of the thousands still stranded at sea were Rohingya -- an impoverished Muslim community from Myanmar's western Rakhine state.
"They said the Rohingya have gone to Bangladesh and have mixed up with the Bangladeshis who are coming to Malaysia in particular for jobs."
Bishop said that Indonesia's director-general of multilateral affairs, Hasan Kleib, had told her that on one vessel, Bangladeshis accounted for 400 of the 600 people onboard.
Yesterday it said its navy had rescued a boat in the Bay of Bengal and brought to shore 208 people.
Tin Maung Swe, a senior official in the western state of Rakhine, told AFP that "about 200 Bengalis" were onboard.
"Bengalis" is a term often used pejoratively by Myanmar officials to describe the Muslim Rohingya minority, 1.3 million of whom live in the country but are not recognised as citizens.
Australia, which maintains a hardline policy of denying asylum-seekers who arrive by boats resettlement and which turns back vessels when it can, has maintained its refusal to resettle any stranded boat people, saying to do so would encourage people-smuggling.
"So it would be utterly irresponsible of me or anyone to suggest for a second that we will reward people for doing something so dangerous.
