I scanned through here kinda quick, so this may have Bean covered. Some fish, it's better to bleed them out rather than killing them quick. For example, Hawaii Skin Diver Magazine did an article on Yellow Tails and the author talked of cutting the gills and bleeding out the fish, then gutting it while still in the water. All to preserve the meat. Once the YT senses danger, it's urine goes into it's blood stream (if I recall correctly). That will taint the meat if it is not removed.
I don't know what species around Japan might require this, but putting it out there for others to comment on.
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