stone moroko, monkey goby, common roach, wild aggressive freshwater fish from east, coldwater omnivore, european river biotope

pseudorasbora parva topmouth gudgeon adult gobioninae rutilus cyprinid neogobius fluviatilis juvenile goby gobiidae aquascape asian invasion common widespread water curious natural aqua behaviour biotic animal harmful destructive fishkeeping underwater weed decorative closeup fish tank gravel native wild predator nature sand ecology threat unusual fauna deathly aquadesign adaptable swim wildlife dangerous captive controlled conditions environment glass refraction