Personally, fish and fish are homophonic and sound similar, so fish symbolizes in some cases, that is, it means wealth! In many local folk customs, when offering sacrifices to ancestors at the end of the year, it is important to provide fish, which means more than one year.
Another meaning is that the natural phenomenon that fish can't live without water can be understood as the emotional expression of the joy of fish and water, which implies the deep affection between men and women and the love of husband and wife.