The migrants had been attempting to reach Europe, Khames el-Boussefi, a spokesman for the Libyan Red Crescent, told AFP.
"We have not been able to verify their nationalities, but they are presumed drowned after their boat sank," he said, adding that none of the migrants had identity documents.
"The remains were handed over to the authorities who will take care of their burial," he said.
People smugglers have exploited the chaos gripping Libya since the 2011 uprising that overthrew dictator Moamer Kadhafi to traffic migrants across the Mediterranean to Europe.
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It is often impossible to identify the bodies of those who die during the attempt. Many are buried in numbered graves outside Libyan towns.
At least 3,800 people have died or disappeared in the Mediterranean since the start of the year, the highest toll ever, a spokesman for the UN refugee agency UNHCR told AFP on Wednesday.
Almost 100 migrants went missing on Wednesday after their Europe-bound boat sank, while 29 were rescued, the Libyan navy said Thursday.
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