Appears to prefer quiet reaches of oxbow lakes or arms with dense vegetation on borders; where it occurs in the main river channel, sand and gravel substrate mainly with occasional rocky rapids; during the day associated with marginal cover in holes in banks, root stocks and aquatic weed beds .
Dorsal spines (total): 0; Dorsal soft rays (total): 21 - 25; Anal spines: 0; Anal soft rays: 26 - 30. Diagnosis: Head length 25.8-29.6% of standard length; predorsal length 61.9-65.7% of standard length; preanal length 57.5-61.7% of standard length; depth of caudal peduncle 33.4-39.8% of its length; 12 scales around caudal peduncle; 37-39 scales in lateral line row . : fusiform / normal.
Behavioural data for Petrocephalus Longicapitis is currently being reviewed.
Freshwater; demersal. Tropical
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