european bitterling, rhodeus amarus, little omnivore wild fish in a nuptial colors for spawning, temperate freshwater biotope aqua

acheilognathinae active adult amarus animal aqua aquarium aquatic behaviour biotope bitterling clear coldwater coloration colors cyprinid driftwood ecology endemic europe european fauna fin fish fishkeeping free freshwater funny gravel grey gudgeon healthy ichthyology line litter little local look macro mouth natural nature nuptial omnivore ornamental plant protection rhodeus river space spawning swim tank temperate topmouth underwater water watermilfoil weed widespread wild