bitterling male in bright spawning coloration fight for dominance leaf litter on sand bottom, freshwater domesticated fish

adult amarus animal aqua aquadesign aquarium aquatic behaviour biotic biotope bitterling captive clear closeup coldwater conditions controlled cyprinidae decorative dominant driftwood 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 tank temperate threat underwater unusual water widespread wildlife