Reports say Ibrahim was dressed as a woman and driving when troops surrounded him.
Local TV claimed he had mixed with a group of villagers fleeing the besieged town.
Mustafa bin Dardef of the National Transitional Council's Zintan Brigade said: "Misrata fighters contacted us and gave us the information that Mussa Ibrahim has been captured."
Ibrahim, 37, was the public face of Mad Dog's regime until NTC fighters took Tripoli last month.
Ibrahim — who studied politics at Exeter University — had continued to denounce the new government from his bolt-hole in Sirte.
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