Ryan Tsang

What the most humane way to euthanize a fish?

I have a sick fish that's not gonna make it. I was thinking of putting him in some cold water and put him in the freezer. Would his vitals just quietly shut down thus painlessly go?

Yousaf

Well, considering that the most humane way to euthanize a human is with chemicals, maybe you could just put him in a disposable bowl with some draino or antifreeze in it.

Philip_G

put him in a plastic cup of tank water and put it in the freezer, they just "slow down" as the water gets colder until everything stops.
Could go the opposite way and plunk him in boiling water too, the shock would probably kill him instantly.

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Mark Hayenga

Freezing is good. But don't use cold water to start out with, just use normal tank water. Let him cool down slowly, it will prevent thermal shock. They're ectotherms so his metabolism will just slow down to a crawl, and then he'll die.

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Brian Johnson

I'm new to the fish tank hobby & now have a thriving 30 gallon setup.
In my months prior to setting up I've read everything I could online regarding the hobby & this has came up.
While it may sound brutal, I've read that simply cutting off his head is the quickest/painless way to kill a fish. Instant death.
You don't want anything that will lengthen the fishes suffering like freezing him.
They also say flushing is NOT the way to go. Imagine spending the last moments of your life swimming in crap & goo. I guess if the fish is already dead it doesn't matter.

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Cees Alons

Freezing (or boiling) seems too cruel.

The quickest and least painful, and therefore most humane, way would be what Brian says, but difficult for you to do perhaps: take him out and quickly cut (hack) off his head with a sharp meat knife. He/she wouldn't feel a thing.

I know someone who dropped a sick fish in a liquid Nitrogen bin at the lab were he was working. But freezing it in your refrigerator would be ... slow.


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Chris

Slow, and not very humane. You're right, a quick use of a knife is the least pain, but probably hard to do. If you have some Gravol type solution (Hydroxyzine is a good one), it's a liquid nervous system inhibitor, designed for sleep in humans. But it will ahem, kill animals. But, because it's a nervous system inhibitor, they wouldn't feel it.

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Cees Alons

One thing more.
Is he/she really in pain? If not, you could postpone (avoid) that quick blow and wait. Often those animals die gracefully, without much suffering.


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Jason Adams

I was going to suggest to put him in a bowl of water with ammonia in it, which would oxidise the gills, but I suppose that wouldn't be humane.

charlie o

all drains lead to the ocean.