Oryzias marmoratus (Aurich, 1935)
Marmorated medaka
Oryzias marmoratus
photo by Parenti, L.R.

Family:  Adrianichthyidae (Ricefishes), subfamily: Oryziinae
Max. size:  4.09 cm SL (male/unsexed)
Environment:  benthopelagic; freshwater; pH range: 7.5 - 8.5, non-migratory
Distribution:  Asia: Indonesia.
Diagnosis:  Dorsal soft rays (total): 9-12; Anal soft rays: 20-26. Distinguished from all other members of the genus by the combination of the following characters: 20-26 anal rays; 9-12 dorsal rays; 31-32 scales in lateral row; body depth 25-31% SL; and color pattern of male in life with greyish brown head and body with diffuse dark brown blotches irregularly dispersed on body and always with a row of 5-9 larger blotches more or less irregularly organized above axial stripe (Ref. 26687).
Biology:  Non-annual breeder. Is very difficult to maintain in aquarium (Ref. 27139).
IUCN Red List Status: Near Threatened (NT); Date assessed: 13 June 2018 (B1b(i,ii,iii,iv)+2b(i,ii,iii,iv)) Ref. (130435)
Threat to humans:  harmless


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