What is the largest fresh water crayfish is the giant Tasmanian freshwater crayfish?

The giant Tasmanian freshwater crayfish (Astacopsis gouldi) is the largest freshwater crayfish species in the world. Native to Tasmania, Australia, it can grow up to 80 cm (31 inches) in length and weigh over 6 kg (13 pounds). This species is known for its impressive size and is considered a delicacy, but it is also threatened due to habitat loss and overfishing. Conservation efforts are underway to protect this unique species and its habitat.