I'd suspect not for very long. The dissolved oxygen level in the club soda would be pretty low, I'd expect, and the club soda would also likely be somewhat more acidic than the fish would be used to. I suppose if one used a species of fish that was adapted to a somewhat acidic environment (not sure how acidic it would be, offhand) and that had low oxygen requirements, it might survive for a reasonable while.
If you weren't expecting a serious answer, well, all I have to say is that questions in my house (by which I mean one of my areas of expertise slightly less ignorance) tend to inspire me to put on my Serious Hat.
What I was mainly thinking the problem would be was the carbonation. Bubbles tend to form on any porous surfaces, so I'd be worried that the fish's gills would get covered in CO2 bubbles, rendering them useless.
If my memory serves me correctly, anoxia and elevated levels of CO2 dissolved in the Earth's oceans is suspected to be a cause of the Permian extinction 250 Myr ago, the most severe mass extinction in the history of the world. 90% of all species perished, and the marine life was hit particularly hard. As I recall, land animals survived better because their lungs allowed them to expel the CO2 more efficiently. But it's been ... ouch! 10 years since I took Paleontology, so the picture may have changed by now.
In any case, I agree, the fish would not survive long.
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If you weren't expecting a serious answer, well, all I have to say is that questions in my house (by which I mean one of my areas of expertise slightly less ignorance) tend to inspire me to put on my Serious Hat.
no subject
What I was mainly thinking the problem would be was the carbonation. Bubbles tend to form on any porous surfaces, so I'd be worried that the fish's gills would get covered in CO2 bubbles, rendering them useless.
no subject
In any case, I agree, the fish would not survive long.