Turkey had earlier declared that it was closing down its six land and sea border crossings with Greece and Bulgaria in an effort to contain the spread of the novel coronavirus.
"The approach of not intervening against migrants wishing to leave Turkey remains in practice but this (new) approach covers sea crossings because of the dangers," Turkish coastguard tweeted.
In a joint statement, 65 organisations warned of the dangers to the safety and health of approximately 1,800 unaccompanied minors stuck on Greek islands.
The EU needs to apply the rules it has on asylum seekers and accept its fair share of refugees.
The migrants, of apparent Afghan origin, were mostly in good condition but seven received first aid in hospital, police reported.
The Turkish coast guard rescued 31 migrants whose boat sank in the Aegean Sea.
Greek PM Alexis Tsipras speaks on Turkey-Greece ties, refugee crisis, Cyprus dispute, and issues of Muslim Turks in Western Thrace, ahead of a two-day visit to Turkey.
Mustafa Kaymakci, head of the Culture and Solidarity Association of the Turks of Rhodes, Kos, and the Dodecanese, says a plot of land spanning over 34,000 sq m belonging to the NGO is set to be sold off in an auction later this month.
The Greek island camp is full of Afghan refugees, who spend their days in what they say is "filth and degradation".
The worst of the refugee crises might be over, but migrants seeking a better life are finding new ways to Europe.
Female refugees are particularly vulnerable to abuse and in Greece Amnesty International is urging the government to do more to protect women.
Unions are seeking a five percent pay rise after an eight-year pay freeze under Greece's international bailout programme, which ended last month.
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