If crucian carp is killed by artificial slaughter, there is no deterioration or corruption, and can be consumed normally after processing; if crucian carp itself is diseased or poisoned, it may contain toxins or harbor bacteria, and cannot be consumed. 1. Artificial slaughter and death: If crucian carp is freshly slaughtered in the market, or if it is slaughtered and died by itself, timely processing, no spoilage, high temperature cooking, it can be consumed. 2. Carp is dead or poisoned: dead fish may have residual toxic components, or has been breeding a large number of bacteria, deterioration, spoilage, nutritional value is also reduced, at this time you can not eat, easy to gastrointestinal reaction, causing acute gastroenteritis and other diseases.