Greece has appealed to the EU to support its plan to reduce the numbers of migrants living in overcrowded refugee camps on the Aegean Islands.

The country suggests segregating people from nations with a “low recognition rate” of asylum eligibility – namely Algeria, Pakistan and Morocco – along with migrants judged to be behaving improperly in “pre-removal” detention centres on the mainland.

But human rights organisations have previously argued that singling out certain nationalities for removal is “arbitrary and illegal”.

The request comes after the European Commission announced that member states should be able to send asylum seekers back to Greece from March 2017.

Under EU rules the first country of entry must process an asylum seeker's claim, but that system collapsed in 2015 when Greece was overwhelmed by a million people trying to use it as a gateway to richer European states.

Other EU countries reacted by closing their borders, leaving some 62,000 stranded in Greece. Refugee camps on the Greek islands are in some cases operating at double capacity and have become squalid, according to humanitarian agencies.

A letter to to the EU interior ministers and the EU Commission on Friday, Greek Migration Minister Yiannis Mouzalas said the overcrowding – on Chios, Samos, Leros and Kos – was mostly down to migrants whose asylum claims were “manifestly unfounded”.

“It is important to address the concerns of the local population and curb the adverse reactions already noted in many islands where the situation is difficult,” he said.

He added that the Greek government thought migrants from countries where there is only a slight chance of achieving asylum should be transferred to “pre-removal centres” on Greece's mainland where they will be kept under tight security before being returned to Turkey.

Mr Mouzalas claimed this would not be a long term solution and promised “special units” in the centres that would make a decision on an applicant's asylum claim within a three-week period.

The proposals are likely to meet opposition from humanitarian groups, who may argue that the suggestions contavene the UN 1951 Refugee Convention by “arbitrarily” discriminating against asylum-seekers based on their nationality.

He sent the letter to both to the EU interior ministers and the EU commission, urging them: “Your support is requested to make the... emergency action possible, to help decongest the islands smoothly, effectively and immediately.”

Some 16,300 refugees are now thought to be living on the Aegean islands in camps that often lack basic services. According to Human Rights Watch, due to a lack of space in the official shelters, unaccompanied children have been detained, sometimes with adults.

Aid workers have also reported that lack of proper drainage systems in the camps mean the tents flood when it rains.

While the rate of those making the dangerous oversea journey to Greece has lowered since March, when the EU signed a deal with Turkey, the processing of asylum claims has been painfully slow.

In pictures: Refugees on the Greek island of Lesbos Show all 12 1 /12 In pictures: Refugees on the Greek island of Lesbos In pictures: Refugees on the Greek island of Lesbos Refugee children at the Moria camp in Lesbos In pictures: Refugees on the Greek island of Lesbos Refugees queuing for food at the Kara Tepe camp in Lesbos In pictures: Refugees on the Greek island of Lesbos Refugees' tents at the Kara Tepe camp in Lesbos In pictures: Refugees on the Greek island of Lesbos Refugees at the Oxy transit camp in Lesbos In pictures: Refugees on the Greek island of Lesbos Refugees waiting to board ferries to the Greek mainland in Mytilene, Lebos In pictures: Refugees on the Greek island of Lesbos Refugees waiting to board ferries to the Greek mainland in Mytilene, Lebos In pictures: Refugees on the Greek island of Lesbos Refugees waiting to board ferries to the Greek mainland in Mytilene, Lebos In pictures: Refugees on the Greek island of Lesbos The graves of drowned refugees in Mytilene, Lesbos In pictures: Refugees on the Greek island of Lesbos A building used to house unaccompanied children at the Moria camp in Lesbos In pictures: Refugees on the Greek island of Lesbos Refugees queuing to register at the Moria camp in Lesbos In pictures: Refugees on the Greek island of Lesbos Refugees at the Moria camp in Lesbos In pictures: Refugees on the Greek island of Lesbos Refugees arriving on smugglers' boats from Turkey in Lesbos

UNHCR spokesperson William Spindler said: “As of 7 December, only 6,259 asylum seekers had left Greece under the EU Relocation Mechanism, less than 10 per cent of the 66,400 agreed last year.

“This is an unacceptably poor response, causing unnecessary uncertainty for people, affecting children including those who are unaccompanied, and prolonging a humanitarian situation for Europe that should have been resolved months ago and which risks encouraging people to move on with the help of smugglers.

“UNHCR appeals to European countries to do the right thing, by ending this situation without further delay.”

The International Rescue Committee said is was “gravely concerned” about the vulnerable lives living in the camps amid freezing winter conditions.

In response the the EU’s announcement that member states should be able to send migrants back to Greece from March, head of the organisation’s Brussels office Imogen Sudbery said: “The responsibility for this response cannot continue to be levelled at Greece.