dominant male of gudgeon or bitterling in bright spawning coloration swim in a planted freshwater nature aquarium

acheilognathinae amarus animal aqua aquarium aquatic background beautiful behaviour biotope bitterling blur blurred bright captive clear coldwater coloration concept conditions controlled copy cyprinid dark decorative dominant dwarf ecology endangered endemic europe european eye fauna fin fish fishkeeping free freshwater grey gudgeon ichthyology light line litter live local look low macro male natural nature ornamental planted protection rhodeus river space spawn spawning species swim tank temperate topmouth underwater water widespread wild