It is ok to kill the eel at noon in advance and cook it at night. Whether eels go bad or not is usually affected by the number of microorganisms. If eels are slaughtered and stored in vacuum, it is usually difficult for microorganisms to survive in a low oxygen environment. Therefore, eels preserved in this way generally do not go bad. If the eel is killed, it will not deteriorate overnight in the refrigerator, and the human body can eat it in moderation;