danube crayfish show belly on front glass, animal predator move legs and claw, hornwort plant, european planted biotope

abdomen antenna appendage aquaculture aquadesign astacidae astacus background behaviour biodiversity bogwood camouflage carapace clearwater coldwater conditions controlled crayfish crustacean cultivation dark decapod destructive dof domesticated driftwood ecology ecosystem edible environment exoskeleton fauna fishkeeping habitat hardscape harmful hobby instinct leptodactylus narrowclawed necrophage nocturnal omnivore periopod rostrum shallow space temperate threat turkish underwater vegetation water weed wildcaught wildlife