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Actinopterygii (ray-finned fishes) > Siluriformes (Catfish) > Akysidae (Stream catfishes) > Akysinae
Etymology: Akysis: Derived from Greek, a = without + Greek, kysthos = bladder (Ref. 45335); varius: The specific name is derived from the Latin varius (variable), in allusion to the highly variable number of serrae on the posterior edge of the pectoral spine.. More on author: Kottelat.

Environment / Climate / Range Ecology

Freshwater; benthopelagic. Tropical, preferred ?

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Asia: Mekong basin.

Size / Weight / Age

Maturity: L_m ? range ? - ? cm
Max length : 4.0 cm SL male/unsexed; (Ref. 30857)

Short description Morphology | Morphometrics

Dorsal soft rays (total): 5-6; Anal soft rays: 8 - 10; Vertebrae: 31 - 33. Distinguished from all its congeners by the following unique combination of characters: truncate caudal fin; length of caudal peduncle 16.1-19.8% SL; depth of caudal peduncle 6.5-9.3% SL; length of adipose-fin base 25.6-29.5% SL; interorbital distance 42-46% HL; eye diameter 13-20% HL; length of nasal barbel 44-66% HL; straight lateral margins of the head when viewed dorsally; and 0-5 serrae on the posterior edge of the pectoral spine (Ref. 30226).

Hides in decomposing vegetation in stream beds, where it apparently feeds on zooplankton and rotifers (Ref. 30226).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

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Ng, H.H. and M. Kottelat, 1998. The catfish genus Akysis Bleeker (Teleostei: Akysidae) in Indochina, with descriptions of six new species. J. Nat. Hist. 32:1057-1097. (Ref. 30226)

IUCN Red List Status (Ref. 109396)

Data deficient (DD)

CITES (Ref. 94142)

Not Evaluated

Threat to humans

Harmless

Human uses

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Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805): PD₅₀ = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.00389 (0.00180 - 0.00842), b=3.12 (2.94 - 3.30), based on all LWR estimates for this body shape (Ref. 93245).

Trophic Level (Ref. 69278): 3.5 ±0.6 se; Based on size and trophs of closest relatives

Resilience (Ref. 69278): High, minimum population doubling time less than 15 months ().

Vulnerability (Ref. 59153): Low vulnerability (10 of 100) .

Entered by Sampang-Reyes, Arlene G.

Modified by Torres, Armi G.

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Akysis varius Ng & Kottelat, 1998