Iraq's exports from the ports, managed by the central government in Baghdad, averaged 3.426 million bpd in February, down from 3.49 million bpd in January.
The semi-autonomous Kurdistan region exports about 300,000 bpd of crude from northern Iraq through a pipeline across Turkey.
There were no exports in March from the Kirkuk fields, located in northern Iraq but under the control of Baghdad, the oil ministry said in a statement.
Kirkuk oil exports stopped in October, when Iraqi government troops backed by Shi'ite paramilitary forces dislodged Kurdish fighters from the region.