narrow-clawed crayfish climb on front glass, show belly and tail on sand gravel, hornwort planted biotope aquarium, wild caught

adaptable animal antenna appendage aquaculture aquadesign aquarium astacidae astacus background behaviour belly biodiversity biotope captive caught ceratophyllum clearwater climb conditions controlled crayfish crustacean cultivation danube dark decapod demersum destructive domesticated driftwood ecology ecosystem edible environment european exoskeleton fauna freshwater front glass gravel habitat hardscape harmful hornwort instinct invasive leptodactylus molting narrow-clawed nature necrophage nocturnal omnivore organic periopod planted pollution predator rostrum sand sandbed show space species substrate tail telson temperate threat turkish underwater unusual water weed widespread wild wildlife