european bitterling, rhodeus amarus, beautiful ornamental adult male fish demonstrates spawning behaviour near a bivalve mollusc

acheilognathinae adult amarus animal aqua aquarium aquatic beautiful behaviour biotope bitterling bivalve clear coldwater cyprinid decorative demonstrates driftwood endemic europe european eye fauna fin fish fishkeeping freshwater gravel grey gudgeon line litter live local look macro male mollusc natural nature ornamental rhodeus river spawn spawning tank temperate topmouth underwater water widespread wild