bitterling adult male in bright spawning coloration swim in a planted freshwater biotope aquarium, beautiful ornamental species

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