The black sac inside SINONOVACULA constricta is usually called "navel" or "SINONOVACULA constricta eye", which is the digestive gland of SINONOVACULA constricta, and its main function is to digest food and excrete waste. Generally speaking, the black sac in the razor clam is not recommended to be eaten, because it may contain pollutants such as sand ingested by the razor clam, which is harmful to human health.

If you accidentally eat the black sac in your stomach, it may cause discomfort and gastrointestinal discomfort, and may even lead to infection and disease. Therefore, in order to avoid the harm caused by eating black sac, it is best to remove it before eating razor clam. When purchasing razor clam, we should pay attention to its appearance, activity, water quality, volume, origin and preservation, choose razor clam with bright appearance, vitality, reliable origin, moderate size and good preservation, and avoid buying polluted or deteriorated razor clam.

Matters needing attention in purchasing razor clam

1. Appearance: Fresh razor clam should have smooth shell surface, bright color, no cracks, no stains and no peculiar smell.

2. Activity: Fresh scorpions should have vitality and can open their own shells. If the scorpion doesn't move or the shell has dispersed, it may be that the scorpion is dead.

3. Water quality: The water that the razor clam grows should be clear and pollution-free. When buying, you should choose a guaranteed channel to avoid buying polluted scorpions.

4, volume: choose a moderate size scorpion, too big or too small scorpion is not necessarily delicious.

5. Origin: The taste of razor clam in different regions will be different, so you can choose razor clam with good taste.