Aquarist Atlas
Ricefish · Sulawesi ricefish · Oryzias

Oryzias wolasi

Parenti, Hadiaty, Lumbantobing & Herder, 2013

2 cited sourcesName checked against Eschmeyer’s Catalog of Fishes, update of

IUCNDATA DEFICIENT · 2019
DDnot on the EX–LC scale
CARESNOT LISTED
Type localitySulawesi Tenggara, Regency of Konawe Selatan, District of Wolasi, Village of Andambao, Sungai Andambao near where crossed by road, 85 meters altitude, 3°15'05.2"S, 122°29'03.0"E, Indonesiaper Catalog of Fishes
Scientific size1 in2.9 cm standard length
Temperature75–79 °F24–26 °C
Depth—not recorded
DietNot documented for this species; ricefishes in general take small invertebrates and algae at or near the surface
BreedingNot documented for this species
Sexual dimorphismNot documentedNot documented for this species
PhotographsSee photosGoogle Images →

Oryzias wolasi is a ricefish from the Andambao River in the Wolasi district of southeast Sulawesi, described in 2013 together with O. asinua. FishBase gives a maximum of 1 in SL.

Taxonomy & naming

Parenti, Hadiaty, Lumbantobing and Herder described the species in 2013 from the Sungai Andambao in the Wolasi district, Konawe Selatan. The name refers to the district.

Morphology

A small ricefish; FishBase gives a maximum of 1 in SL.

Habitat

Streams of the Konawe Selatan Regency in southeast Sulawesi. FishBase describes slow to swift freshwater streams over mud, small rocks and plant debris, with emergent grasses on the banks. It also occurs in a cool (24 C) swift stream below Sumbersari Falls and in a warmer (26 C) spring-fed coastal stream.

Feeding

Diet is not documented.

Mating

Courtship has not been described.

Breeding

Breeding has not been documented.

In the aquarium

Not known in culture.

Conservation

The IUCN Red List assessed Oryzias wolasi as Data Deficient in 2019, meaning there is too little information to judge its extinction risk.

Common questions

Oryzias wolasi: how big does it get?
Up to 1 in standard length (SL).
Oryzias wolasi: what water temperature does it need?
The atlas records 75–79 °F for this species.
Oryzias wolasi: where does it come from?
It is recorded from Indonesia.

On a list: Nano fish

Related species compared · Oryzias

SpeciesAdult sizeTemperaturepHHardnessIUCN
Oryzias wolasithis species1 in SL75–79 °F——DD
Daisy's ricefishOryzias woworae1 in SL—pH 6–7—EN
Oryzias asinua1 in SL———EN
Oryzias moramoensis1 in SL———NE
Soeroto's ricefishOryzias soerotoi1 in SL———CR
Indian ricefishOryzias carnaticus1 in SL———LC
Mekong medakaOryzias mekongensis1 in TL———LC
Indian medakaOryzias dancena1 in SL———LC
Chinese medakaOryzias sinensis1 in SL———LC
Oryzias cabaranensis1.5 in SL———NE
Oryzias nebulosus1.5 in SL———NT
Oryzias chenglongensis1 in SL———NE

Recorded ranges from each species’ own page; hardness is the tolerance its sources give, not a measurement of the water it lives in. See all 40 Oryzias species →

Also from the Southeast Sulawesi

Sources

  1. FishBase — Oryzias wolasi Parenti, Hadiaty, Lumbantobing & Herder, 2013
  2. Eschmeyer's Catalog of Fishes (California Academy of Sciences) — Oryzias wolasi

Naming authority: Oryzias wolasi in Eschmeyer’s Catalog of Fishes ↗

Last reviewed 2026-10-05.

How to cite

Aquarist Atlas (2026). Oryzias wolasi. Aquarist Atlas.https://www.aquaristatlas.com/ricefish/oryzias-wolasi/

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Where it has been recorded

1 georeferenced record (GBIF). Each point is a field observation or museum specimen — pan and zoom to explore where this species turns up. The coordinates come straight from GBIF and are often rounded or tied to the nearest town or river landing, so a dot can sit just beside the actual water rather than in it.

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