1. Freezing the fish in a deep freezer. The fish's metabolism
doesn't feel coldness as pain. This is a very soft way.
2. Throw them on a hard wall (or toilet) while they are in a net.
Make sure that they are dead!
3. The biologist's way: Take a sharp knife (razor blade) and
cut through the fish's neck. That will kill them immediately.
Harro
harro.hieronimus at t-online.de