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. Batasio
havmolleri (Smith, 1931) is currently considered
a junior synonym of B. fluviatilis.
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.
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.
- Adult with young - note the
juvenile body pattern
aquarist Stuart Brown has successfully spawned B.
fluviatilis. Below is a short account of his
thoughts and above image shows an adult and youngsters.
As with most catfish the juveniles will show a different
colour pattern until growing into adulthood.
out the filter sock on my sump and I find three stowaways.
Obviously the big one ( inch and a bit) is from the
first spawning. I would say the 2 smaller ones are
about 2-3 weeks old. Seems large water changes are
the trigger, coupled with the changing weather perhaps".(Original text fromFB Group:
of the World.)
Malay Peninsula, south of isthmus of Kra and north
of Perak River basin and Terengganu River. Type
locality: Klong Thalerng near Ronpibun, Peninsular
Dorsal spines (total): 1; Dorsal
soft rays (total): 7; Anal spines: 4-5; Anal soft
rays: 8 - 9. Differs from Batasio merianiensis
by having length of adipose fin base 30.0-33.3%
SL (vs. 22.2) and eye diameter 18.2-23.5% SL (vs.
Distinguished from all other
species of the genus Batasio, except Batasio
merianiensis in having an adult colouration
consisting of a dark oblique predorsal bar and a
dark spot on the sides of the body below the middle
of the adipose-fin base.
Care & Compatibility
suitable for your usual community tank as they will
need special conditions such as good water flow and
a cooler temperature. Good water conditions should
be adhered to at all times with regular water changes
to keep organic waste down to a minimum. A sand and
gravel mixed substrate with scattered rocks/boulders
and root works would be ideal for a good water flow.
In their natural habitat plants will not be present
but hardy plants such as Microsorum, Bolbitis
or Anubias spp., can be grown attached to
the decor. Not especially competitive and should not
be kept with much larger or more aggressive fishes.
Suitably-sized, peaceful, schooling cyprinids are
ideal, or if geography isn't’t an issue many
characids and livebearers should also work. In addition,
balitorid loaches from genera such as Gastromyzon,
Pseudogastromyzon and Homaloptera
are suitable, and some members of the families Cobitidae
and Nemacheilidae should also be ok but proper research
is essential as some can be excessively aggressive/territorial
or simply grow too large.
An egg scatterer.
Males possess a clearly visibly,
elongate genital papilla anterior to the anal fin.
Feeds readily on any type of
the usual fish foods, flakes, granulated food, frozen
or live food
Fleshy finlike projection without
rays, behind the rayed dorsal fin. Dorsal fin:The primary
rayed fin(s) on top of the body. Anal Fin: The median, unpaired, ventrally
located fin that lies behind the anus, usually on the
posterior half of the fish. Entopterygoid: A paired bone articulating
with the palatine in front. Metapterygoid: Posterior bone that
ossifies in the cartilaginous palatoquadrate arch. It
first appears as a rod of bone with an anterodorsally
projecting process from the middle of the dorsal surface
(6.4 mm). The adult metapterygoid is roughly rectangular
in shape with rounded corners and an anterodorsally
projecting spine that meets the entopterygoid medially
in a synostosis at its posteromedial edge. The posterior
end curves dorsally to form the posteroventral surface
of the orbit. Palatine: The teeth present on the
palatine bone which lies laterally in the roof of the
mouth. Vomer: The anterior bone in the mid-line
of the roof of the mouth.
the local (Bengali) name of the fish (batasio or batashi).
A. , N. Anganthoibi, and W. Vishwanath, 2011
- Zootaxa 2901: 52-58 Batasio convexirostrum, a new
species of catfish (Teleostei: Bagridae) from Koladyne
basin, India. FB Group:Catfishes
of the World.
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. www.seriouslyfish.com