Yu Hong explained when it is suitable to eat fish.

1, after the solar term, it will continue to Tomb-Sweeping Day. 2, Qingming to long summer.

Fish in spring is easy to catch, and it will last until after the solar terms, and it will last until the breath of Tomb-Sweeping Day. After the shock, everything will recover. Although there is occasional cooling, the temperature rises in a zigzag way. The second stage is from Qingming to long summer, because the temperature is neither too high nor too low, and there is less low-pressure weather, so fish can find food in shallow water for a long time.