MS-222 used to euthanize fish?

Very recently I made the decision to euthanize one of my fish, however the quickest method I could conceive was a heavy object unfortunately I do not think the fish died instantly [Quickly, but not instantly]

I do not feel that blunt trauma is a suitable method and I intend on using MS-222 in future and I need some information on how to use it.


How do I administer MS-222 to small cold water fish?

How much is needed?


If you have any additional information or better alternatives then please state them.
 
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