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A lionfish is a venomous fish. They are notable for their extremely long and separated spines, and have a generally striped appearance, red, green, navy green, brown, orange, yellow, black, maroon, or white.  Spine of lionfish is part of a student's standard potion-making kit 
- Harry Potter and the Philosopher's Stone (First mentioned)
- Harry Potter and the Goblet of Fire (Mentioned only)
- Harry Potter and the Half-Blood Prince (video game)
- Pottermore (Mentioned only)