ornamental adult pair of gudgeon or bitterling fish in spawning coloration swim in a planted nature deisgn aqua

acheilognathinae adult amarus animal aqua aquarium aquatic beautiful behaviour biotope bitterling clear coldwater coloration copy cyprinid decorative deisgn dense dwarf echinodorus ecology endemic europe european eye fauna female fin fish fishkeeping free freshwater grey gudgeon line litter live local look macro male natural nature ornamental pair plant planted protection rhodeus river space spawn spawning swim sword tank temperate topmouth underwater vegetation water widespread wild