captive omnivore wild freshwater fish common roach, european river planted biotope aquarium, adaptable coldwater elodea, bur-reed

rutilus cyprinidae invasion endemic common sparganium erectum elodea canadensis widespread silver water domesticated aqua behaviour biotic animal aquatic fishkeeping underwater weed decorative temperate closeup fish tank local wild caught omnivore predator ecology threat fauna aquadesign swim wildlife controlled conditions pet ecosystem organic pollution litter algae environment ichthyology hobby interaction recreation pastime space explore glass refraction