Dreaming about a fish market can be interpreted as a symbol of abundance or prosperity.
If the fish market in the dream was vast, bright, large and full with people, it could represent that you are feeling abundant or prosperous. You may be taking care of others financially which is good for everyone.
If the fish market is small and dark this could indicate that you have a fear about money or financial stability. Do you remember the dream if there was any rotting fish in the fish market? Be cautious in the waking hours and avoid new adventures.