[header] How to humanely kill a fish [title] Ask a veterinarian if possible. [step] There are many species of aquarium fish, and for most of them the ideal drug dosages and other conditions are unknown. A veterinarian is trained to notice signs of suffering and adjust the process if necessary, giving your fish a less painful death. 
[substeps] Only methods reasonable to perform at home are included in this article. Other methods, such as electrocution and lethal injection, are difficult to perform humanely without training, and/or can harm the person performing them.