Noun
draining blood from a live fish (from above the gills and at the base of the tail) to keep it fresh
fasting fish for several days to preserve flavour and quality (and reduce mortality during transport)
esp. いけしめ
killing fish in a fishtank (immediately before cooking); fish killed in a fishtank
esp. いけしめ
Also written 活締め【いけじめ】、活締【いけじめ】、活〆【いけじめ】、活け〆【いけじめ】