rhodeus amarus, european bitterling, freshwater fish, male in spawning coloration, biotope aquarium photo

adult amarus animal aqua aquarium aquatic biotope bitterling caudal clear closeup coloration colourful cyprinid decorative dorsal endemic europe european eye fauna fin fish fishkeeping freshwater gravel grey gudgeon line lips live local macro male mouth native natural nature operculum photo predator rhodeus river spawning squama tank topmouth underwater water weed widespread wild