Humane killing (euthanasia) of aquatic pets (under construction)

Aquatic animals, like other pets sometimes need to be killed humanely to prevent them for suffering unnecessarily. 

At all times pet euthanasia methods used must comply with local laws such as those regulating the use and disposal of toxic substances. The summary below is not an endorsement of the safety or legality of any method--it is an easy-reference summary of various other sources of information (listed at the end). You are encouraged to consult with your veterinarian to determine the most appropriate method to use.

Aquarium animals and plants should never be released into the natural environment. It is the responsibility of the owner to rehome or euthanise any animal they no longer wish to own.

Fish

Finquel
With any animal a chemical that first sedates, and then kills, the fish is considered the most humane non-physical option. Commercial fish sedatives such a FinQuel (also called Tricaine or MS-222) will cause a humane death at high enough dose and exposure--double the dose required for sedation is commonly recommended. As the need to euthanise may arise unexpectedly, it would be wise to keep a bottle of FinQuel available. FinQuel should be stored in a tightly sealed container at room temperature--and never used on fish that will be eaten. Avoid inhaling Finquel or having it in contact with your eyes--use of a face mask and gloves is recommended.

To euthanise a small fish with Finquel place the fish in a 1 gallon container with water from the aquarium, or similar dechlorinated water. Add one half teapoon of Finquel powder and one half teaspoon of baking soda a small amount of water and add to the contain.

Clove Oil
A viable alternative to FinQuel is the use of clove oil which is less expensive and requires fewer precautions. However clove oil is better introduced gradually, a few drops at a time.

Baking Soda
Alternatively baking soda added to water increases carbon dioxide which causes narcosis.  This will only be effective in water below PH 7, and so you may need to pre-treat the water with a pH decreaser.  Add one tablespoon of baking soda per cup of water and fully dissolve.  Add the fish to the solution using a net.

Regardless of the method, wait at least 15 minute and until the fish has ceased all movement including gill movement and is prone in its side. Due to the potential for recovery from any sedative, death should then be completed assured by a physical method or freezing before disposal.


Snails
Dombrowski (2007) recommends the following methods for veterinary euthanaisa of aquatic invertebrates such as snails:
* tricaine methanesulfonate (1-4 g/L)
* magnesium chloride (10%)
* dilute ethanol (10%)
followed by immersion in ethanol (70%) or freezing. But concentrate ethanol or freezing should not be used as the primary form of euthanasia for humane reasons.

See also:
Pharyngula: How to euthanize a fish
UltimateBettas: Euthanasia Techniques

Finquel Suppliers:
Argent Labs (small order charge of $15)
Drs Foster & Smith
PondRx
PondShop

Aspidoras Egg Watch

These guys are aspirdoras, a but like a corydoars that's been stretched. One of my females was looking a little frisky today, and sure enough--I have some eggs. Not many, but I thought I would try raising them.

Here they are in the handy-dandy egg hatcher. The shot glass keeps them comtained, the air stone keeps them agitated to stop fungus.  The temperature now should be fine for them even without a heater.

Edited to Add: No luck with the egs but I see I have a baby Aspidoras in the tank, so it seems like they do better if I just leave them to it :)

Unscheduled 95% Water Change

At 3am my filter was sounding off so I got up. I turned on the light and found my ten gallon tank had only in inch of water in it and the HOB was churning air.

It turns out the air tube had come of the air pum, then somehow suction had been created and the water had drain out of the tank through the airstone onto the carpet.

WTF? Has this ever happened to anyone else?

Human Health and Aquarium Keeping

Salmonella
Warm aquarium waters is able to incubate a number of potentially harmful bacteria including species of Salmonella (Hay & Seal, 1994). This bacteria can travel internationally in "carriage" water. Such bacteria have the potential to cause stomach disorders, septicemia and meningitis. Water from domestc sources is a relatively low risk but aquarium keepers should wash their hands after being in contact with aquarium water.

References

• Dombrowski, D. (2007). Emergency care of invertebrates. Vet Clin Exot Anim 10, 621-645.
• Hey, J & Seal, D.V. (1994) Tropical aquaria water and diarrhoea. The Journal of Infection 30, 84-5.