many years when i was in the army... my 8" koi died. so my mom put it in the freezer until i got back for the weekend.
it was still beautiful after 9plus months in the freezer ( once a while i'll take him out, admire its scales and talk to it...)
then it disappeared, no one know where it go, i hope nothing dreadful happened to it or to some else, hahaha!
go on! it's ok to put pet fishes in there!