Properly preserved overnight crayfish can be eaten, but the deterioration of the overnight crayfish is not edible.
Crawfish is more nutritious, it contains more high-quality animal protein, while the flavor is delicious, so it is widely loved. Crayfish overnight need to be properly preserved, if closed in a complete container, and placed in the refrigerator, generally harmless, can be consumed.
However, if crawfish are left at room temperature for a long period of time and already have an off-flavor, or spoilage occurs, it is not recommended for consumption. At this time the crayfish will decompose more indole, ammonia, amines and other harmful substances, while a variety of harmful bacteria growth and reproduction, causing nausea, vomiting, abdominal pain, abdominal distension and other gastrointestinal reactions, triggering acute food poisoning.
Crayfish is recommended to eat as soon as possible after cooking to avoid the health risks arising from the protection of health. Crayfish allergy is prohibited.