Taxonomy & naming
Herder and Chapuis described the species in 2010 from the southern shore of Lake Masapi. The name honours Renny Hadiaty, an Indonesian ichthyologist who has collected and described many Sulawesi fishes.
Morphology
A small ricefish; FishBase gives a maximum of 1.5 in SL.
Habitat
Lake Masapi in the Larona drainage, Sulawesi Selatan. The species is not known from elsewhere. FishBase describes the lake as an almost circular blackwater lake only a few metres deep, surrounded by rain forest.
Feeding
Diet is not documented in detail.
Mating
Courtship has not been described.
Breeding
Breeding has not been documented.
In the aquarium
Not known in culture.
Conservation
The IUCN Red List classes Oryzias hadiatyae as Vulnerable, meaning it faces a high risk of extinction in the wild. FishBase notes that the introduced snakehead Channa striata occupies the same shallow shoreline habitat and appears likely to threaten it.