perca fluviatilis, european perch and rhodeus amarus, european bitterling, freshwater predator and prey in biotope aquarium

adaptable amarus and animal aqua aquarium aquatic beast biotope bitterling bug caudal clear closeup colourful decorative dorsal driftwood endemic eurasian european eye fauna fin fish fishkeeping fluviatilis freshwater gray green hobby juvenile line lips live local macro mouth native natural nature operculum orange perca perch percidae photo plant predator prey rhodeus southern squama stripe tank underwater water weed widespread wild