scorpionfish; hairy stingfish
Refers to Scorpaenopsis cirrhosa, a venomous marine fish. The name is a specific biological term.
The scorpionfish has venomous dorsal spines, so caution is needed.
The name combines 鬼 (oni, 'demon') and カサゴ (kasago, 'scorpionfish'), likely referring to its fierce appearance. The exact derivation is uncertain.