Quote Originally Posted by -MARWOLAETH- View Post
What would be the most humane way to euthanize a fish?
Put them in a separate container that is NEVER used for ANYTHING else living, and add a few drops of clove oil. It's the quickest way to euthanize a healthy fish.
Just make sure the container never even touches water that goes to any other reptile/amphibian/fish, as even a small amount can be fatal.

Clove oil can be found in most Asian markets or ordered online, but it's not very common in a lot of regular grocery stores.