Some scientists have called thawing permafrost a time bomb cite to piece evidence why

On the rolling landscape of shrubs and moss around Hudson Bay, they probe the once impenetrable ground now thawing in places due to global warming.

Read more at: https://phys.org/news/2015-11-permafrost-climate.html#jCp

I’d have to say no because without oxygen in the water the fish would all be dead. so if you want to fish for dead fish, pick the ponds with the lowest oxygen concentrations.