Please choose the correct ending to complete the given sentence: Pets and Animals: [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.

Ending1: If you live in an area where fish is attacking other fish, you may want to fish instead of fish. Ask your veterinarian if you can cut open a fish as long as you don't see a vein running through it. Ending2: [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. Ending3: It's also a good idea to ask any questions that might arise regarding your own aquarium animal population. [substeps] Many aquarium dwellers act as babysitters, contributing to the conflicts among the fish's relatives. Ending4: [substeps] Tap the fish in your hand using an ice cube tray, or get a special glass container and place it in the fridge. Set the temperature to the lowest temperature possible.

Answer format: ending1/ending2/ending3/ending4