rhodeus amarus, european bitterling, wide-spread wild freshwater fish and unio pictorum, painter`s mussel, coldwater river biotope

adaptable adult amarus animal aqua aquarium aquatic background biotope bitterling bivalve clear coldwater decorative detritis ecology endangered endemic eurasian european fallen fauna fish fishkeeping freshwater gravel leaves litter local mollusc mollusk mussel native natural nature oak ornamental painters pictorum rhodeus river sand shell species substrate tank underwater unio unionidae valve water widespread wild yellow