Offering Blue Moon Black Crayfish (Cherax sp. Black Scorpion Blue Leg) – approximately 5 … 7 cm in size. The image used above is for illustration purposes only. Please click here to see the crayfish profile explaining the keeping and breeding conditions for this species. We offer free shipping. Please double-check if you need a licence to keep non-native crayfish in your country, also carefully check our Delivery Conditions before you place an order.