A Puffer-fish is a fish that can inflate it's own body in defence. It is a brown fish that can be found in the Black Lake of Hogwarts School of Witchcraft and Wizardry. The eyes of a Puffer-fish can be used as an ingredient in the Swelling Solution.
- Harry Potter and the Chamber of Secrets (Mentioned only)
- LEGO Harry Potter: Years 1-4 (NDS and IPhone versions only) (First appearance)