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Teleostei (teleosts) > Anabantiformes (Gouramies, snakeheads) > Osphronemidae (Gouramies) > Macropodusinae
Etymology: Betta: Malay/Javanese origin. Bleeker (1850, 1858) indicates Ikan Wadder Bettah as the local name of Betta trifasciata Bleeker, 1849 (now Betta picta, Valenciennes, 1846) in the Ambarawa Javanese dialect. Ikan Wader is a common Javanese name for smaller freshwater fishes, especially cyprinids (already used in Old Javanese). See Blust, R. & Trussel, S. Austronesian Comparative Dictionary. Web Edition (https://www.trussel2.com/acd/).
More on authors: Ng & Kottelat.

Environment: milieu / climate zone / depth range / distribution range Ecology

Freshwater; benthopelagic. Tropical

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Asia: known from Selangor and Perak in Malaysia. Its range extends to Riau Archipelago, Indonesia (Ref. 56386).

Size / Weight / Age

Maturity: L_m ? range ? - ? cm
Max length : 7.8 cm SL male/unsexed; (Ref. 13093)

Short description Identification keys | Morphology | Morphometrics

Dorsal spines (total): 1; Dorsal soft rays (total): 8; Anal spines: 2; Anal soft rays: 28. Differs from Betta chloropharynx in the following characters: horseshoe-shaped black throat mark (vs. µ-shaped black throat mark); presence of both dorsal and caudal transverse bars (vs. absence); more subdorsal scales (mode 6 1/2 vs. 5-6). It is distinguished from Betta renata in the following characters: horseshoe-shaped black throat mark (vs. kidney-shaped); non-spotted opercle (vs. spotted opercle); opercle with yellow or brown lower margin (vs. black margin); fewer postdorsal scales (mode 12 vs. 9 1/2); more anal fin rays (mode 30 vs. 29); more lateral scales (mode 32 vs. 31). Can be differentiated from Betta spilotogena in the following characters: horseshoe-shaped black throat mark ((vs. black median spot); non-spotted opercle (vs. spotted opercle); opercle with yellow or brown lower margin (vs. back margin); presence of both dorsal and caudal transverse bars (vs. absence); and more subdorsal scales (mode 6 1/2 vs. 5 1/2) (Ref. 56386).

Facultative air-breathing (Ref. 126274); Occurs in backwater peat swamps with substrate usually peat and leaf litter. Large fish are found in the flowing sections of the blackwater streams and smaller ones appear to prefer pools and slower flowing waters.

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Main reference Upload your references | References | Coordinator | Collaborators

Ng, P.K.L. and M. Kottelat, 1994. Revision of the Betta waseri species group (Teleostei: Belontiidae). Raffles Bull. Zool. 42(3):593-611. (Ref. 13093)

IUCN Red List Status (Ref. 130435: Version 2024-1)

Endangered (EN) (B1ab(iii)); Date assessed: 05 January 2019

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

Harmless

Human uses

FAO - Publication: search | FishSource |

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Estimates based on models

Phylogenetic diversity index (Ref. 82804): PD₅₀ = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.01000 (0.00377 - 0.02651), b=2.97 (2.74 - 3.20), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).

Trophic level (Ref. 69278): 3.3 ±0.4 se; based on size and trophs of closest relatives

Resilience (Ref. 120179): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).

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

Betta hipposideros Ng & Kottelat, 1994