1. When you choose a clam, you can look at its shell. A shiny shell means good quality, while a dark shell means stale.

2. According to the weight of Scapharca subcrenata, the heavier Scapharca subcrenata is fleshy, so it has no weight in your hand, and there is definitely not much meat in it.

3. Smell the smell. Scapharca subcrenata is good, but it has some strange smells, which are stale, maybe dead and rotten.

4. Touch its opening. When touched, it responds quickly, that is, it is fresh and energetic, and vice versa.