Marmorated medaka (Oryzias marmoratus)

Scientific name: Oryzias marmoratus Aurich, 1935

Marmorated medaka (Oryzias marmoratus)

The Marmorated medaka (Oryzias marmoratus) is a freshwater fish of the family Adrianichthyidae that grows to about 4 cm (1.6 in). It is easy to keep and peaceful, is best kept in a species tank and needs a tank of at least 40 L (11 US gal), water at 22–25°C (72–77°F) and a pH of 7.5–8.5. Native range: Asia, Indonesia.

Marmorated medaka care at a glance

Care level
Easy
Temperament
Peaceful
Community tank
Not suitable
Adult size
4 cm (1.6 in)
Minimum tank
40 L (11 US gal)
Temperature
22–25°C (72–77°F)
pH
7.5–8.5
Hardness
1–40 dGH (18–714 ppm)
Diet
Omnivore. Accepts flakes, frozen foods and live foods.

Biology

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.

Source: FishBase, licensed CC BY-NC 4.0.

Species facts

Scientific name
Oryzias marmoratus
Family
Adrianichthyidae (Ricefishes)
Order
Beloniformes (Needle fishes)
Class
Actinopterygii (Ray-finned fishes)
Maximum length
4.1
Environment
Freshwater;; pH range: 7.5 - 8.5 benthopelagic; non-migratory
Climate
Tropical
Distribution
Asia: Indonesia.
Conservation status (IUCN)
Vulnerable (VU) (D2)
Threat to humans
Harmless
Uses
Aquarium: commercial
Resilience
Low, minimum population doubling time 4.5 - 14 years (Assuming fec

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Sources

Taxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0. Aquarium care parameters compiled, checked and converted to metric and imperial units by Guppies.za.net.

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