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Down arrow Cat-eLog Data Sheet
Scientific Name Batasio convexirostrum  Darshan, Anganthoibi & Vishwanath, 2011
Common Name
Type Locality Mat River, tributary of Koladyne River, near Mat bridge, 22°54'N, 92°52'E, Lunglei District, Mizora state, India.
Pronunciation bah tah see oh - con vex ee rost rum
Etymology The genus name comes from the local (Bengali) name of the fish (batasio or batashi). The specific name is derived from the Latin convexus, meaning rounded/curving out; and rostrum, meaning snout: formed as an adjective.
Down arrow Species Information
Identification The bagrid genus Batasio Blyth comprises of small, laterally compressed catfishes distributed in South and Southeast Asia, diagnosed from its confamilials in having large sensory pores on the head, a narrow mental region, a pair of posteriorly-directed processes on the anterior part of vomer, a transversely-elongated bar-like entopterygoid, and the metapterygoid in close contact with the quadrate but free from the hyomandibular (Mo, 1991).

Batasio convexirostrum is distinguished from its congeners (except B. dayi, B. elongatusand B.procerus) in having a head and body coloration consisting of only a dark-brown vertical predorsal bar (vs. predorsal bar absent altogether, or if present, in combination with either a mid-lateral stripe, a dark-brown spot, or a series of vertical bars posteriorly) against a lighter-brown body. It differs from B. dayi in having a longer snout (length:39.2–45.5% HL vs. 35.5–38.7% HL), a greater number of pectoral-fin rays (9–10 vs. 8) and vertebrae (39–40 vs.36–38), and the dorsal fin dark grey at base and distal one-third, hyaline in between (vs. black, hyaline close to its base); and from both B. procerus and B. elongatus in having a shorter dorsal-to-adipose distance (1.7–4.1% SL vs.4.4–14.2), and fewer gill rakers on the first branchial arch (4–5 vs. 9–27). Batasio convexirostrum further differs from B. procerus in having a greater eye diameter (24.6–29.8 vs. 17.2–22.6% HL), a deeper head (19.6–21.7% SL vs. 16.8–18.6), a longer snout (39.2–45.5% HL vs. 33.8–38.3) and a longer pectoral-spine (14.6–17.6% SL vs. 8.9–13.2), a greater number of pectoral-fin rays (9–10 vs. 7–8), and fewer vertebrae (39–40 vs. 41–43); and from B.elongatus in having a deeper body (20.2–21.6% SL vs. 15.8–19.3) and a greater number of vertebrae (39–40 vs.36–38).
Sexing Not known.
General Remarks Not exported for the trade as yet.
Down arrow Habitat Information
Distribution The species is presently known only from the Koladyne River and the Mat River (a tributary of the former) in Mizoram State, India.
Indian waters, North Eastern India Waters, Kaladan (click on these areas to find other species found there)
African Waters, Angola Waters, Mat (click on these areas to find other species found there)

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IUCN Red List Category Not Evaluated
Temperature 20.0-25.0°C or 68-77°F (Show species within this range)
Other Parameters The water should be cool and heavily oxygenated with a good flow as these fish occur in hill streams.Anything above 25 C will hamper long term survival as these fish tend to burn away at higher temperatures.
Down arrow Husbandry Information
Feeding Is known to take processed food but prefers live food like blood worms, frozen brine shrimp etc. Needs sometime to gradually get weaned off live foods. Spot feeding will help in case tank mates are voracious feeders.
Furniture Fine sand for the bottom and smooth pebbles / rocks. Cover / hiding spots can be created with either plants or wood.
Compatibility A peaceful species suitable for a hillstream biotope.
Suggested Tankmates Peaceful Cyprinids like Puntius and Balitorine loaches like Schistura or Nemacheilus species.
Breeding Unreported in the aquarium.
Breeding Reports There is no breeding report.
Down arrow Further Information
Reference Zootaxa No. 2901, pp 53, Figs. 1-2.
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Last Update 2019 Oct 26 05:19 (species record created: 2011 May 31 14:10)