The river at the type locality runs through grassland/savannah and the habitat can be characterized as mildly disturbed; the water is clear, deep, and swift flowing, with area of calmer water, and the substrate mostly sandy to rocky .
Dorsal spines (total): 2; Dorsal soft rays (total): 6 - 7; Anal spines: 0; Anal soft rays: 15; Vertebrae: 42 - 44. Diagnosis: Ancharius griseus is distinguished from A. fuscus in having a longer dorsal-fin spine, 22.9-24.3% of standard length vs. 14.6-22.6%; longer snout, 49.2-51.3% of head length vs. 40.1-45.8%; smaller eye, 9.3-10.1% of head length vs. 11.4-15.4%; and pectoral spine serrated posteriorly along only its distal half vs. entire length . : fusiform / normal.
Behavioural data for Gray Madagascar catfish is currently being reviewed.
Freshwater; demersal. Tropical central Madagascar (Ref.
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