Transfigures the target into a fish (most likely).
Piscifors is a Transforming spell. Its effect is unknown, but the name of the spell suggests that it would be used to transfigure something or someone into fish. It is one of the spells randomly shouted during the Third Task in the video game adaptation of Harry Potter and the Goblet of Fire. This could be the spell Lily Evans used to turn a flower into a fish.
The prefix Pisci- probably derives from the Latin piscis, meaning "fish" and the suffix-for (often used in transfiguration incantations) is Latin for "chance, luck, fortune", though it may also come from form (or simply English form) meaning "form".
- Harry Potter and the Goblet of Fire (video game) (Mentioned only)