Fish do fine during the coldest of winters as long as you give them two feet of water to swim in, oxygenate the water, and keep a hole in the ice with a bubbler or floating heater, allowing the naturally produced gasses to escape from under the ice. Otherwise, you let Mother Nature do the rest. The fish will spend the entire winter hibernating at the bottom of the pond and then they will slowly wake up as the water warms in spring.
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Founder & Master Pond Builder
Jaak Harju is the founder and master pond builder of Atlantis Water Gardens, a family-owned design and build firm specializing in natural-looking ponds, waterfalls, and ecosystem water features. Since 2000, Jaak has dedicated his career to creating outdoor environments that inspire connection with nature.
With a background in landscape design and construction, Jaak brings artistry and precision to every project. He’s known nationally for his creative stonework, ecological pond design, and educational outreach within the pond-building community. Through his work, videos, and collaborations with other Aquascape-certified contractors, Jaak has helped redefine backyard water features as sustainable, living ecosystems.