Ayarnangra estuarius is a species of catfish (order Siluriformes) of the family Erethistidae.

A. estuarius is endemic to Myanmar where it is found in the large tidal rivers in the lower Ayeyarwady River.

[1] This species feeds on comparatively large invertebrates.

[1] A. estuarius has no thoracic adhesive apparatus, a granulate anterior margin of the pectoral fin spine, a smooth to granulate anterior margin of the dorsal fin spine, a slender body shape, moderate gill openings, and a papillate upper lip.

[2] This species of fish reaches a length of 4.59 centimetres (1.81 in) SL.