The boat was escorted by the Coast Guard to port, where the illegal migrants were disembarked for counting and then taken to a local indoor gymnasium conceded by the municipality.
Greek authorities said the migrants were mostly of Pakistani or Afghan origin and were in good health. The group included 126 men, two women and one child, while one of the women was pregnant.
The men will be housed in the indoor gymnasium while the pregnant woman was taken for a precautionary medical examination. The second woman and child will be housed in the port authority's headquarters.
According to the Astakos Port Authority, one or more migrant smugglers were possibly among the migrants.
The catamaran was headed for Italy while the location it set sail from remains unknown.