Because "fish" and "surplus" are homophonic, in China's traditional view of dream interpretation, dreaming of fish has always been closely related to wealth. Dreaming of fish swimming in clear water symbolizes that you will gain wealth and power, or that you are in a good mood and situation now, or that you will have unexpected income or status promotion.
Dreaming of dead fish indicates disappointment and depression, and you may encounter setbacks, your career is not smooth, your life is hard, and you are hungry.