Freezing cold

Europe is suffering under a cold spell. Austrolebias don’t necessarily die when it freezes. I’ve filled a small greenhouse with 90 liter tanks, some containing few old fish bred in 2010 and early in 2011. These fish are too old and too large to transport to a different site and have already survived a cold spell outdoors, with 3 cm of ice on their tanks. They are otherwise healthy. I want to give them a chance to reproduce in spring and therefore decided not to disturb them nor euthanize them.
In the greenhouse, during the night, tanks have so far frozen over with ice of about 1 cm thick. Since cold weather usually means sunshine, the greenhouse heats up during the day, removing the ice cover again and allowing the fish to breathe well. The total amount of water in the greenhouse is large, about 400 liter. I hope everything goes well, but there is a risk of failure. Then I will need to invent a better system in order to protect my old fish; or move or euthanize them all before winter.

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