活いき締じめ

1. 1draining blood from a live fish (from above the gills and at the base of the tail) to keep it fresh Translated by Jiyomi
2. 2fasting fish for several days to preserve flavour and quality (and reduce mortality during transport) Translated by Jiyomi
3. 3killing fish in a fishtank (immediately before cooking) ; fish killed in a fishtank Translated by Jiyomi

Other writings and readings

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JMdict entry 2656970. Source and licence.