I haven't read The Classic of Mountains and Seas, but I dreamed of-? Fish, what is this?

Anything strange may happen in our life, including our usual dreams. There is a movie starring Stephen Chow called Su, the martial arts champion. Su dreamed that the beggar leader taught him martial arts through dreams. Although it's just a movie, the story in the movie is true, because shamanism in China comes from dreams. The one who appeared in the Classic of Mountains and Seas in your dream? Fish may ask you for money, because this kind of fish can't be seen at all in real life, so your road to wealth is full of unknowns.