Inhabits streams, preferring deep back waters and slow-flowing portions. Forms shoals in the middle of the water column with Hephaestus jenkinsi Whitley, 1945. Occurs in clear waters over rocky substrates, usually where algae are in abundance. Found in highest abundance during snorkelling in Pitta Creek, 1km upstream from the confluence with the Prince Regent River .
Dorsal spines (total): 12; Dorsal soft rays (total): 12 - 13; Anal spines: 3; Anal soft rays: 8 - 9; Vertebrae: 25. Syncomistes carcharus is distinguished from other congeners within the Syncomistes complex by a combination of the following characters: jaw rounded with a tapered point when viewed from below in adults (jaw shape of juveniles unknown); mouth terminal; mouth slightly oblique; teeth conical; longest dorsal ray > 16.7 % SL; longest dorsal spine > 13.4 % SL; pectoral fins > 22.8 % SL; upper caudal lobe > 29.9 % SL .: fusiform / normal.
Behavioural data for Sharp-toothed grunter is currently being reviewed.
Freshwater; benthopelagic. Tropical
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