Kill a fish

Dry asphyxiation can take from half (herring) to 4 hours (sole or plaice) to become unconscious and even longer to die!

According to many, the most humane method is to freeze it in a plastic bag with water.

Neck cut (cutting spinal cord behind the head): oxygen supply to the head continues, so the fish is not (immediately) dead). It does if you cut the head off. This seems acceptable if you hit the fish hard (on the skull, between the eyes) first. A bat (with a lead head) that is used for this is called fish bat or 'priest'.

Cut the belly from head to anus open, remove all the guts and wash it. The scales can be scraped from tail to head.

Fish: animal that grows fastest between the caught and the telling about it.