Oryzias nebulosus Parenti & Soeroto, 2004
photo by JJPhoto

Family:  Adrianichthyidae (Ricefishes), subfamily: Oryziinae
Max. size:  3.3 cm SL (male/unsexed)
Environment:  benthopelagic; freshwater
Distribution:  Asia: Endemic to Lake Poso and its tributary stream, Sulawesi, Indonesia.
Diagnosis:  Dorsal soft rays (total): 9-11; Anal soft rays: 21-22; Vertebrae: 30-32. Having a unique sexual dichromatism: adult males dark gray to black in color, while females lighter grayish-yellow to brown. Some adult males possess external conical teeth on the jaws. Lateral process of pelvic bone is in line with the third or fourth pleural rib; precaudal vertebrae 11-13, modally 12; and dorsal fin relatively anterior (origin above 12-14th anal-fin ray); straight, narrow and slender ossified and cartilaginous portions of the gill arches. Dorsal body profile arches gently from head to dorsal-fin origin (Ref. 54508).
Biology:  Collected in the morning in clear water over a bottom of sand, pebbles and fallen branches and during night time from a boat traveling along the lake shore, including the mouth of the tributary stream (Ref. 54508). Infested with parasitic copepods, Lernaea sp. (Ref. 54508).
IUCN Red List Status: Near Threatened (NT); Date assessed: 16 November 2018 (B1b(iii)) Ref. (130435)
Threat to humans:  harmless


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