bio.wikisort.org - Animal

Clarias nigricans is a species of clariid catfish. It is only known from the Mahakam River in eastern Borneo. The eel-like catfish of this region were long assumed to belong to the widespread species Clarias nieuhofii but examination of 6 specimens purchased from a fish market in Samarinda in 1999 and preserved specimens from the same location revealed consistent and distinctive differences indicating a separate species.

Clarias nigricans
Conservation status
Data Deficient  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Siluriformes
Family:	Clariidae
Genus:	Clarias
Species:	C. nigricans
Binomial name
Clarias nigricans H. H. Ng, 2003

This is an elongated catfish up to 30.8 cm (12.1 inches) standard length. Compared to C. nieuhofii it has a "neck" distinctly narrower than the head, giving the head an egg-shaped appearance when viewed from above or below and the overall colour is much darker: purplish grey with much fainter white spots arranged in one row below the lateral line instead of two.

References

• Ng, H. H. (2003). Clarias nigricans, a new species of clariid catfish (Teleostei: Siluriformes) from eastern Borneo. The Raffles Bulletin of Zoology 51: 393–398.
• Froese, Rainer; Pauly, Daniel (eds.) (2011). "Clarias nigricans" in FishBase. December 2011 version.

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