The apex maritime regulatory agency disclosed that the are from Philippines, Slovenia, Ukraine, Romania, Croatia and Bosnia.
Recall that crew members were abducted on Saturday from the vessel that was travelling between the cities of Lagos and Port Harcourt.
Head Maritime Safety , NIMASA Sunday Umoren said seven of those abducted were from the Philippines and one from each of the other five countries.
Though names of the crew were not mentioned ,the agency said attack happened around 45 nautical miles southwest of Bonny Island.
Kidnapping for ransom is a common problem in parts of Nigeria.
The MV Glarus was carrying wheat between Lagos and the southern Niger Delta oil hub of Port Harcourt.
The pirates took 12 of the ship’s 19 crew members captive.
Massoel Shipping, which operates the MV Glarus, said in a statement: “The company is working with the authorities and specialists to secure the speedy and safe release of those being held.”
It did not disclose the nationalities of those kidnapped but the Swiss foreign ministry said none were from Switzerland.
Kidnapping for ransom is a big problem in Nigeria, with the Niger Delta region a particular target as it is the source of most of the country’s crude oil.
A number of foreigners have been kidnapped in the last few years in the southern Niger Delta region, source of most of the oil that is the mainstay of the West African nation’s economy.
A senior analyst at EOS Risk Group, Jake Longworth, in a report published in July, said the number of seafarers taken hostage in the Gulf of Guinea rose from 52 in 2016 to 75 as a last year.
He said that although the number of people kidnapped was similar in the two years, there was a trend for pirates to take more hostages in each attack.
Longworth said 35 seafarers were kidnapped for ransom in the region in the first half of 2018
