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🐟Japanese rice fish
The Japanese rice fish, also known as the medaka, is a member of genus Oryzias (ricefish), the only genus in the subfamily Oryziinae. This small native of Japan is a denizen of rice paddies, marshes, ponds, slow-moving streams and tide pools. It is euryhaline, occurring in both brackish and freshwater. It became popular as an aquarium fish because of its hardiness and pleasant coloration: its coloration varies from creamy-white to yellowish in the wild to white, creamy-yellow, or orange in aquarium-bred individuals. Bright yellow, red or green transgenic populations, similar to GloFish, have also been developed, but are banned from sale in the EU. The medaka has been a popular pet since the 17th century in Japan. After fertilization, the female carries her eggs attached anterior to the anal fin for a period before depositing them on plants or similar things.
Text: Wikipedia, CC BY-SA 4.0.
IUCN Red List assessment, 2019.
- Body mass
- not recorded
- Body length
- 0.04 m
- Shoulder height
- not recorded
- Top speed
- not recorded
- Bite force
- not recorded
- Maximum lifespan
- 5 years
Everything we know about the Japanese rice fish
Typical adult figures. Where a value is an estimate rather than a measurement, it says so.
Body length0.04 mmaximum recordedFishBaseDetails ↓Hide ↑
Source: FishBase · v25.04 · CC BY-NC 4.0
Maximum lifespan5 yearsAnAgeDetails ↓Hide ↑
data quality: acceptable
Source: AnAge · AnAge build 15, 2023-07-03 (HAGR) · CC BY 3.0
Gestation10 daysAnAgeDetails ↓Hide ↑
data quality: acceptable
Source: AnAge · AnAge build 15, 2023-07-03 (HAGR) · CC BY 3.0
Trophic level3.4FishBaseDetails ↓Hide ↑
Source: FishBase · v25.04, estimate table · CC BY-NC 4.0
DietcarnivoreaverageDetails ↓Hide ↑
From trophic level 3.4 (FishBase): <2.2 herbivore, 2.2–2.8 omnivore, >2.8 carnivore.
Danger to humansharmlessFishBaseDetails ↓Hide ↑
Source: FishBase · v25.04 · CC BY-NC 4.0
average = a mean across sexes or species in a group.
Not recorded for Japanese rice fish yet: body mass, shoulder height, top speed, bite force.
Family tree
- kingdomAnimalia
- ›phylumChordata
- ›orderBeloniformes
- ›familyAdrianichthyidae
- ›genusOryzias
- ›speciesOryzias latipes
- superclassRay-finned fish · Actinopterygii
- orderBeloniformes
- suborderAdrianichthyoidei
- familyAdrianichthyidae
All 13 branches ↓Fewer branches ↑
- kingdomMetazoa
- phylumChordata
- subphylumCraniata
- subphylumVertebrata
- superclassGnathostomata
- superclassRay-finned fish · Actinopterygii
- classActinopteri
- subclassNeopterygii
- orderAcanthomorphata
- superorderAtherinomorphae
- orderBeloniformes
- suborderAdrianichthyoidei
- familyAdrianichthyidae
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