sera guide - My pond

27 A tip: Plants with hard stems, such as bulrush, allow gas exchange also when the pond is entirely covered with ice during the winter. They should therefore be cut back only in spring. 27 Winter The temperature in the bottom water layer is constantly 4°C (39°F) in ponds with a mini- mum depth of 1 m (3.3 ft.), the temperature becomes lower closer to the surface. This temperature is sufficient for hibernating the fish. No additional heater is required. How- ever, in a hard winter with lasting ice forma- tion on the pond it may be necessary to keep a part of the pond free from ice as to ensure oxygen supply. Place a pond pump just underneath the water surface to do so. Please make by all means sure that the deeper and, accordingly, warmer wa- ter layers are not swirled up, other- wise there is danger of fish freezing to death. Breaking the ice layer or walk- ing on it should also be avoided, as this disturbs the hibernating fish and in the worst case may lead to their death. Below 12°C (54°F), you can feed them sera KOI Professional Winter Food if the animals still take up food.

sera guide - My pond

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