Can eat. Crayfish legally farmed according to national regulations can be safely used. There is nothing wrong with crayfish itself, but the problem still lies in people. Even if there are problems after eating, it is mostly due to human factors in breeding, transportation, cooking and processing. These factors are applicable to all foods when the food safety ecology is not healthy enough and the supervision mechanism is not perfect enough. There is no food in this world that can make experts and professors say: eat casually and it is 100% safe. Because our knowledge of things is always unknown, the unknown is full of uncertainty, and even subversive and repetitive. Some foods that were previously considered inedible were later considered edible.