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A Thorny Fish is an enemy appearing in Virtual Boy Wario Land. Four of them appear in separate areas of Stage 3, an underwater stage. A single Thorny Fish also appears in a small underwater area of Stage 7. They swim back and forth between the background and foreground of the stage, with a school of fish often following them closely. While a Thorny Fish is in the background of a stage, it moves slower, appears dark and is unable to harm Wario. On the other hand, a Thorny Fish in the foreground moves faster, and is able to cause damage to Wario.