Lifeless Lake in Siberia
https://www.researchgate.net/publication/200464654

This is a detailed comparison between two lakes in the Trans-Volga region in Russia, one of them being Lake Pustoye. I'm not sure if the Lake Pustoye in this article is the same lake being referred to by the op as it isn't in Siberia and there's no mention of champagne-like water, but it does bear the same name and has a curious lack of fish. The authors found that while there is an absence of fish, there is by no means an absence of life in the waters of Pustoye. In the article, they catalog the seasonal shifts of biodiversity in the waters of both lakes. The pH was observed to be low in Lake Pustoye which they implicated to be the likely cause for the lack of fish, though they indicated that more research would be needed to determine the exact cause of the acidification.