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Batasio fluviatilis (Day 1888)

Image contributors to this species:

Nonn Panitvong (1) Piscesilim (1)  Johnny Jensen's Photographic Library (3) Allan James (1) Stuart Brown (1)

ScotCat Sources:

Factsheet Etymology = Genus  

Other Sources:

Fishbase  Google Search  All Catfish Species Inventory  Wikipedia


Relevant Information:

Batasio species are small, laterally compressed bagrid catfishes generally found in fast-flowing hill streams throughout South Asia, Myanmar, the Salween and Mae Khlong drainages of Thailand and the northern Malay Peninsula. They are diagnosed (together with Chandramara) from other members of the Bagridae in possessing large sensory pores on the head, a narrow mental region, the transversely elongated, bar-like entopterygoid, and the close contact of the metapterygoid with the quadrate (Mo, 1991). Batasio is distinguished from Chandramara by the absence (vs. presence) of a pair of prominent posterior processes on the anterior part of the vomer. Dorsal spines (total): 1 - 1; Dorsal soft rays (total): 7-7; Anal spines: 4 -5; Anal soft  rays: 8 -9. Body with dark brown predorsal oblique bar and a dark brown spot on the side below the adipose fin; dorsal spine length 10.7-12.4% SL; length of adipose-fin base 30- 33.3% SL; body depth at anus 18.7-21.1% SL; snout length 38.3-41.5% HL; eye diameter 18.2-23.5% HL; interorbital distance 25.9-28.6% HL. Occurs in rivers and streams with moderate to swift current and a predominantly rocky bottom; less often in slow-flowing streams with a muddy substrate. Hides among stones or submerged vegetation during the day and comes out at night to feed.

Common Name:



Mystus havmolleri, Mystus stigmaturus, Batasio havmolleri




Asia: Malay Peninsula, south of isthmus of Kra and north of Perak River basin and Terengganu River. Type locality: Klong Thalerng near Ronpibun, Peninsular Siam.


7.0cm (2¾ins)


18-23°C (63-73°F)




Ng, H.H. and M. Kottelat 2001 A review of the genus Batasio (Teleostei: Bagridae) in Indochina, with the description of B. tigrinus sp. n. from Thailand. Rev. Suisse Zool. 108(3):495-511.
Ng, H.H. and M. Kottelat 2007 Batasio feruminatus, a new species of bagrid catfish from Myanmar (Siluriformes: Bagridae), with notes on the identity of B. affinis and B. fluviatilis. Ichthyol. Explor. Freshwaters, Vol. 18, No. 4, pp. 289-300.



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                                                                              updated = August 6, 2018 © ScotCat 1997-2018