european bitterling pair, rhodeus amarus, little omnivore ornamental adult fish in a coldwater temperate freshwater biotope aqua

acheilognathinae adult amarus animal aqua aquarium aquatic 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 omnivore ornamental pair plants potamogeton protection rhodeus river space swim tank temperate topmouth underwater water watermilfoil weed widespread wild