exoskeleton of narrow-clawed crayfish after molting with crustacean hide under driftwood branch in planted biotope aquarium

adaptable animal antenna aquaculture aquadesign aquarium astacidae astacus behaviour biodiversity biotope branch captive caught claw clearwater closeup conditions controlled crayfish crustacean cultivation danube driftwood ecology ecosystem edible environment exoskeleton fauna female free freshwater gravel habitat hardscape harmful hide highly instinct invasive leptodactylus molt molting narrowclawed nature necrophage nocturnal omnivore organic ornamental periopod planted pollution predator rostrum sand sandbed space species substrate telson temperate threat turkish understanding underwater unusual vegetation water weird widespread wild wildlife