1, live crayfish, first soak in salt water for half an hour, then clean it, twist the middle piece of tail, gently pull out the shrimp line, then cut off the head of 1/3 with scissors, and finally cut off the shrimp feet with scissors.

2. See if crayfish live in clear water. At first glance, the back is red, clean and acceptable. Then, look at the fluff on its abdomen and the hair on its claws. If it is white and neat, it is basically raised in clear water.

3. Crayfish, after all, is an aquatic animal that eats humus corpses. Bacteria and toxins will only accumulate in the body, so people try to buy crayfish that have just grown up. When buying, you should know the skin color: the old lobster is red and black or red with metal gray, while the young lobster has a natural and healthy luster. Touch the shrimp shell with your hand. Hard ones are old, elastic ones like nails are just grown and replaced. Try to buy soft-shelled crayfish.

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