Oryzias marmoratus, also known as the marmorated ricefish or marmorated medaka, is a species of fish in the Adrianichthyidae family, from Lake Towuti, Lake Mahalona, Lake Lontoa and associated streams in Sulawesi, Indonesia.
Oryzias marmoratus is endemic to Indonesia. They are a vulnerable species. This species is found in freshwater within a benthopelagic range. It is native to tropical climates. They are considered to be a species that does not migrate. The maximum length of the species is about 4.1 cm (1.6 in). The males are of a grayish-brown color on the head with darker brown splotches on the body. This species is a non-annual breeder. It can be kept as an aquarium species, but it is known to be very difficult to do so. Humans use them for the commercial aquarium trade.
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- Kottelat, M. 1996. Oryzias marmoratus. 2006 IUCN Red List of Threatened Species. Downloaded on 4 August 2007.
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