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!
Periophthalmodon septemradiatus
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.
Eugnathogobius kabilia
Periophthalmodon septemradiatus
puffer
algae eating shrimp - Caridina sp.
catfish
Periophthalmodon septemradiatus
Eugnathogobius kabilia
Mudskipper,
Periophthalmodon septemradiatus
Eel
Probably this one is Pseudogobiopsis oligactics???
Female puffer
Male puffer
Bumble bee goby
Mudskipper,
Periophthalmodon septemradiatus