The eight bodies were on an inflatable craft that can carry up to 120 passengers, said Colonel Fathi al-Rayani, head of the coastguard in Garabulli, 60 kilometres (40 miles) east of Tripoli.
He estimated that "at least 100" migrants were missing.
The boat was spotted deflated off Garabulli, and the coastguard found the bodies inside, said an AFP reporter who accompanied them.
Conflict-ravaged Libya has long been a stepping stone for migrants seeking a better life in Europe.
The Italian coastguard has said that more than 900 migrants were rescued off Libya on Thursday and Friday.
Libyan navy spokesman, General Ayoub Qassem, meanwhile told AFP that coastguards patrolling off Zawiya west of Tripoli on Friday intercepted five inflatables and two wooden boats with more than 570 migrants on board.
He said the boats were being escorted by five Libyans on a jet ski and two outboards, and that three of the men were apprehended.
Intercepted or rescued migrants are often held in detention centres before being repatriated.
People traffickers have exploited the chaos in Libya since the 2011 uprising deposed and killed strongman Moamer Kadhafi to boost their lucrative but deadly trade.
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