How to understand that fish eat ants at high tide and ants eat fish at low tide?

Ants live on land and fish live in sea water. When the tide rises, the ants on the shore are washed into the sea by the tide, and the fish will eat the ants. When the tide ebbs, the tide recedes quickly and the fish stay on the shore. Fish out of water can only be eaten by ants. Ants have their living environment and fish have their way of life. Once they leave their living environment, they will be destroyed.