An amulet, the fish is a symbol for life-giving water. It illustrates how one can swim with the current, avoiding hindrances. This fish will carry you into the realm of dream and visions.
In ancient Egypt, fish amulets were attached to the end of the plait of a child or young female as a charm against drowning. Presumably its magic worked by aversion, it was a reminder of the watery environment its wearer wished to avoid.