cheesy feet
Fish Aficionado
while the best method is fill a container with cold water put it in the freezer until there is a thick sheet of ice on the water level.. shatter that and then place the tropical fish in that water and the fish dies instantly the key is the water must be very very cold not a small sheet of ice on the water.
So you say that would instantly kill it? If a human is put into -0C water we will not die instantly.Just recently (on the news) some guy fell through ice (in the north pole i think) and into freezing water, 3 mins later he was taken out and he recovered later on.Now a humans body temp is 37c and a tropical fishes much lower.Not saying fish and humans are the same but would it not be the same principle?

/www.youtube.com/watch?v=gRTIkj5HF90...ted&search=
To be honest I've never heard of it...