Camberra - Australia breached the rights of Indonesian children it jailed as adults after they came as crew on people-smuggling boats and should apologise, the nation's human rights chief said Friday.

Australian Human Rights Commission president Catherine Branson said 180 Indonesians claimed to be under the age of 18 when they arrived in Australia between late 2008 and late 2011, but some were not believed and put in prison.

"The fact is that a significant number of Indonesian children have been incarcerated in adult correctional facilities, including maximum security facilities... in some cases for very long periods of time," she said.

Branson, releasing a report on the treatment of the minors, said while obviously young Indonesians -- including a boy who claimed to be eight -- were sent home, authorities often relied on wrist X-rays to determine their age.

The accuracy of wrist X-rays, an age-profiling tool which compares an individual's bone growth against a standard "atlas" developed in the United States in the 1950s, was now "discredited", she said.

"We now know that a significant number of young Indonesians assessed to be adults on the basis of X-ray analysis were in fact children, or were very likely to have been children, at the time of their apprehension," she said.

Asked whether Canberra should apologise for the treatment of these minors, who were mostly poorly educated and came from impoverished fishing villages, Branson said: "My feeling would be that they probably should.

"There is a cohort of individuals whose human rights have not been respected in Australia," she added to reporters in Sydney.