adult european bitterling, rhodeus amarus, little decorative fish play in a temperate freshwater biotope aquarium with driftwood

acheilognathinae adult amarus animal aqua aquarium aquatic beauty behaviour biotope bitterling clear coldwater cyprinid decorative driftwood ecology endemic europe european fauna fin fish fishkeeping free freshwater funny gravel grey gudgeon hornwort ichthyology line litter little local look macro mouth natural nature ornamental pair plants play potamogeton protection rhodeus river space swim tank temperate topmouth underwater water watermilfoil weed widespread wild