zander or pike-perch, sander lucioperca, juvenile fish of a common deathly and successful predator in biotope aquarium

animal aqua aquadesign aquarium aquatic behaviour biotope clear common dangerous deathly decoration decorative design driftwood ecology endemic european eye fin fish fishkeeping free freshwater gravel habitat hornwort juvenile lips live look lucioperca mouth native natural nature pikeperch postcard predator prey rare representing river sander sensitive space successful tank temperate underwater vulnerable water weed wild young zander