chinese sleeper juvenile freshwater fish, perccottus glenii, on sand bottom in biotope aquarium

adaptable amur animal aqua aquarium aquatic asia asian biotope bottom bug catfish ceratophyllum chinese clear closeup colourful decorative east ecology eurasia eye far fauna fin fish fishkeeping freshwater glenii green grey hobby invasive juvenile line lips live local macro male marine mouth natural nature odontobutidae perccottus photo predator rest river rotan sand sleeper southern tank underwater water weed widespread wild