How do you determine the freshness of a crustacean?

To determine the freshness of a crustacean, check for a clean, ocean-like smell; any off or overly fishy odors indicate spoilage. Look for clear, bright eyes and firm, intact shells, as dull or cloudy eyes and soft shells can signal age. Additionally, fresh crustaceans should exhibit lively movement if alive, and their meat should be firm and springy to the touch. Lastly, ensure there are no signs of discoloration or unusual slime on the surface.