"Coastguards in the west who were patrolling off the Zawiya refinery today intercepted four large inflatables carrying around 550 illegal migrants," navy spokesman Colonel Ayoub Qassem said.
Those detained were from "several African countries" and included three children and 30 women, eight of whom are pregnant, he told AFP.
"The migrants have been handed over to the relevant authorities to be taken to detention centres," Qassem said.
On Sunday, Qassem said that coastguards had intercepted seven vessels carrying around 850 migrants, again off Zawiya which is some 45 kilometres west of the capital Tripoli.
The onset of better weather conditions has raised fears of huge numbers of people attempting the still perilous sea crossing.
Yesterday, Italy's coastguard said two Italian naval vessels and two operated by Doctors Without Borders (MSF) rescued around 2,000 migrants from unseaworthy boats in 15 separate operations.
An Irish navy ship rescued hundreds more, as did a passing cargo ship, the Italian coastguard said.
So far this year more that 34,000 people have been brought to the Italian coast after being rescued off Libya, according to the UN refugee agency.
It said Operation Sophia "does not in any meaningful way deter the flow of migrants, disrupt the smugglers' networks or impede the business of people smuggling on the central Mediterranean route".
Yesterday, EU foreign ministers gave the green light to expand Operation Sophia's mandate to include training for the Libyan coastguard service.
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