Conservation Actions

More information on the distribution, biology, population size and trends, and the current and potential threats to this species is needed. Specifically, targeted surveys in potentially suitable habitat surrounding the type locality are needed to confirm the presence or absence of this species (H.H. Ng pers. comm. 2019).

Location Information

This species is historically known only from its type locality at the Kali Pepe sub-drainage (of the Bengawan Solo drainage) in Surakarta, central Java (Bleeker 1846). Despite numerous surveys in the Bengawan Solo drainage (Buwono et al. 2017, Shaleh and Chakim 2018), it has not been encountered in over 170 years.

Geographic Range

Possibly Extinct


Population Information

There is no information available on the population and its trend for this species. However, it should be noted that this species has not been obtained in ichthyological surveys of river drainages throughout Java since its description more than 170 years ago. Given the state of riverine habitats in Java (having undergone significant anthropogenic disturbance due to the high density of human habitation there) and the fact that the Bengawan Solo suffers from pollution (Roosmini et al. 2018), the possibility that this species is extinct should be considered.


Urban development, extensive and unsustainable fishing, pollution resulting from industrial, domestic, and agricultural point and non-point sources, and agriculture occur extensively in the area surrounding Surakarta (D. Lumbantobing pers. comm. 2019).

IUCN Red List Account Link

Please click here to see the species' IUCN Red List Account page.