Mastacembelus Dayi (Mastacembelus dayi), first described by Boulenger, 1912 is a fish in the family Mastacembelidae (order Synbranchiformes). It inhabits freshwater systems including rivers, streams, and lakes. It occurs in Tropical waters. It feeds on a mix of small fish and invertebrates as a mid-level predator. On the IUCN Red List, it is classified as Least Concern.
Dorsal spines (total): 35; Dorsal soft rays (total): 77 - 82; Anal soft rays: 76 - 79; Vertebrae: 85 - 86. Body and fins with moderately numerous, relatively large, pale spots with dark edges; spots on fins round; but those on body often vertically elongate; caudal fin rays 25-27 .: eel-like.
Behavioural data for Mastacembelus Dayi is currently being reviewed.
Freshwater; demersal. Tropical known only from three specimens from Irrawaddy river, Myanmar.
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