The Unconscious World of Dream
A fish is a common symbol of fertility, which in psychological terms means (a promise of) personal growth.
If the fish is in the sea, the sea may symbolize the unconscious, the fish unconscious urges (over-eating, etc.)
According to Jung, fish, being cold blooded and primitive creatures, may symbolize a deep level of unconsciousness.
'Fishes and snakes are favourite symbols for describing psychic happenings or experiences that suddenly dart out of the unconscious and have a frightening or redeeming effect' (Jung).
They may also, says Jung, represent libido or greed.
A fish is a symbol of Christ and may therefore function psychologically as a symbol of your true self. This is an 'archetypial' image.
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