Gulf of Guinea piracy has cost Nigeria nearly $800m, according to Nigerian Maritime Administration and Safety Agency head Bashir Jamoh.

Speaking at the country's Chief of the Naval Staff Annual Conference, Jamoh disfavourably compared the $794m figure to the estimated $4.5m piracy has cost Asia, according to a report in domestic newspaper Vanguard.

"Studies have identified the following factors as the drivers of maritime insecurity in the region," Jamoh said in the report.