sander lucioperca, zander or pike-perch juvenile freshwater fish in biotope aquarium

animal aqua aquarium aquatic biotope bug caudal clear closeup decorative depth dof dorsal endemic europe european eye field fin fish fishkeeping freshwater gravel juvenile lips live local lucioperca macro mouth native natural nature operculum photo pikeperch predator rare representing river sander shallow southern squama tank underwater water weed wild young zander