eurasian ruffe, gymnocephalus cernua, ruffe or pope, small freshwater predator fish, closeup view in european river biotope aqua

adaptable adult animal aqua aquarium aquatic background beast biotope blur caudal cernua clear closeup dark decorative dorsal endemic eurasian european eye fauna fin fish fishkeeping freshwater gray gymnocephalus hobby line lips litter live macro mouth native natural nature operculum percidae photo pope predator river ruffe sand small squama substrate tank underwater view water widespread wild