New Zealand is attracting more and more international students here to study for PhDs, but a lack of jobs means only half are likely to stay after they finish their degrees.
Foreign PhD enrolments have trebled since 2005 when the Government allowed them to pay domestic rather than higher international fees.
However, a survey in 2011 found only half of all international PhD students plan to work in New Zealand after completing their studies.
The New Zealand Association of Scientists wants the government to increase the opportunities for graduates, to ensure the country retains their skills.
But Tertiary Education Minister Steven Joyce said the country also benefits from graduates who return overseas, as they help to strengthen international research relationships.