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Best way to Euthanize a large fish - need help


CCA Members
Staff member
I have a large 13" plus fish. She has cancer and as much as i love her, I think its time.
Has anyone euthanized a large fish before? Aside from cutting her, I heard of Clove oil (?) but it is not suggested for fish larger than 2".
I'd like to gently help her go. Thank you for suggestions.


Past CCA President
Staff member
Sorry that you are in this situation. It stinks.

The few times I've had to euthanize, I put the fish in a ziplock and then in the freezer.


Sorry to hear that she has cancer and that you need to put her down. I would use clove oil to put her to sleep then put her in the freezer like Jon said.


CCA Members
I had to put my 13 in flowerhorn down. 5 gallon bucket with tank water then put fish in there and add clove oil until fish appears to be asleep. Then add rubbing alcohol to water. Done under 15 minutes.


Staff member
I'm sorry to hear this. I'd go with clove oil. I have some here if you can't find it. You'll want to add some to a bottle of water and shake it up really well, then gradually add it to the bucket.