This is a large mouth bass. Has gills on side to breath in. Only can live in water. The fish has a greenish texture . So as that is an adaption to the environment. The fish uses the environment in the water such as plants and brush as cover to catch predators and avoid predators .
Mouhoun, very upstream, in an area where there are canyons dug by water and deep holes. Probably the highest predator of the area with some Claridae.