Surveying at Upper Sadong river (clearwater) & middle of Sadong river (blackwater) within a day. First time found so many freshwater puffer in blackwater river & also mudskipper & some gobies that we never seen before!
Carinotetraodon salivator can be found from middle part to upper part of Sadong river but most of them are found in freshwater rivers in middle part which is near to brackish rivers. This red belly puffer fish is a male. Usually male population is smaller than female.
algae eating shrimp - Caridina sp.
Mudskipper, Periophthalmodon septemradiatus
Probably this one is Pseudogobiopsis oligactics???