perccottus glenii, chinese sleeper, juvenile freshwater fish in biotope aquarium

adaptable amur animal aqua aquarium aquatic asia asian biotope bug caudal chinese clear closeup colourful decorative dorsal east endemic eurasia eye far fauna fin fish fishkeeping freshwater glenii gray grey hobby invasive juvenile line lips live local macro male mouth native natural nature odontobutidae operculum perccottus photo predator river rotan sleeper southern squama tank underwater water weed widespread wild