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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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.
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In any case, I agree, the fish would not survive long.