danube crayfish carapace, eyes, legs, hide at twig, gravel substrate, front glass, european planted biotope

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