bitterling male in bright spawning coloration, driftwood litter on sand bottom, freshwater wild caught domesticated fish

adult amarus animal aqua aquadesign aquarium aquatic behaviour biotic biotope bitterling bogwooda captive clear closeup coldwater conditions controlled cyprinidae decorative dominant ecology ecosystem endemic european explore fauna fish fishkeeping free hobby ichthyology interaction line local look macro nano native natural nature peaceful protection research rhodeus sensitive space spawn style tank temperate threat underwater unusual water widespread wildlife