This video shows large leptocephali that were filmed by divers at 3 locations within the Indonesian Archipelago from 2009 -- 2011. These leptocephali were observed in Lembeh Strait adjacent to northeastern Sulawesi Island, at Ambon Island and at Bali, from December to April.
These leptocephali are about 300 -- 400 mm long and appear to be metamorphosing larvae of some type of moray eel of the family Muraenidae. The morphological similarities between these leptocephali and ribbon eels, Rhinomuraena quae