All manatees exported from Africa to Asian aquaria were caught from the wild as there are no manatees in captive facilities in Africa. There are plenty of errors on the public CITES trade database, I've been keeping track of it for years. Three of the Chimelong manatees are likely from Democratic Republic of the Congo, exported illegally in 2019. it's not known where the other 7-8 came from. I believe they have now had 5 calves born there.