From Wiktionary, the free dictionary
Borrowed from Japanese 活け締め (ikejime).
ikejime (uncountable)
- A method of killing a live fish wherein a spike is forcefully inserted into the hindbrain.
2018, Shingo Hamada, Richard Ralph Wilk, Seafood: Ocean to the Plate, Routledge, →ISBN, →OCLC, page 176:In Japan, fish and crustaceans are killed by pushing a wire through their spinal cord, a method called ikejime.