Facultative air-breathing ; A paratype series was collected from a blackwater river running through remnant and intact peat swamp forest, with pH 4.1 .
Dorsal spines (total): 1; Dorsal soft rays (total): 8 - 10; Anal spines: 1 - 2; Anal soft rays: 25 - 29; Vertebrae: 31 - 32. Can be distinguished in possessing the following combination of characters: relatively thick-set body (body depth 24.3-29.0 % SL); head devoid of pattern except for black stripe that runs from black lower lip, through eye to edge of opercle; opercle with gold iridescent scales when live; belly and body with gold iridescent scales; some median caudal rays projecting beyond fin margin . : fusiform / normal.
Behavioural data for Betta Midas is currently being reviewed.
Freshwater; benthopelagic; pH range: 4.1 - ?; depth range 0 - 2 m . Tropical west Kalimantan, Indonesia; possibly Sambas river basin; and extreme western part of Sarawak, in heathforest streams near the town of Lundu.
The following diseases are known to affect Betta Midas.
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