Euthanasia of Terminally Sick Fish
The following information can be used for all warm water fish: Take a bowl that will accommodate the sick fish. Tap water will be fine, as this is a very quick method for the fish. Place the ice in bowl of water into then place the fish in the bowl. To eliminate constant water temperature checks, it is recommended you leave the bowl in the freezer until a thin layer of ice forms on-top of the water.