The scales on the upper part of body have narrow blackish margins and the flanks are marked with five elongated dark brown blotches along their middle with five black spots underneath them.

[3] Pseudogobiopsis oligactis is found in brackish and fresh water in estuaries and the lower reaches of rivers, including in adjacent streams.

[1] It apparently prefers exposed and sunlit streams which are clean with a current running over sandy or clay beds.

In Singapore it was common in the Central Catchment Nature Reserve reservoirs and in streams running through open-country streams while in Peninsular Malaysia they have been found in fast flowing, hill streams which flow into Lake Chenderoh but they could also be found in large numbers along the shores of the lake, where there were submerged trees and stumps, in grassy bays, and in shallow inlets where the lake bed is covered in leaf litter.

[3] Pseudogobiopsis oligactis is able to complete its life cycle in freshwater and is known to have flourished in land-locked conditions since the early 1920s in reservoirs and in their tributary rocky hill streams.