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メダカの越冬 Overwintering Japanese rice-fish

冬が来ると例年は小笠原からの亜熱帯植物のハカラメが気になっていましたが、今年はメダカが加わりました。
当地、尾道の冬の温度ではメダカたちは戸外でも十分越冬できると言われていますが、寒さが苦手な我が身のことを考えると、特に生まれて初めての越冬を経験するメダカたちにも少しは防寒対策を、と思いました。
水槽の外側を空気層のある断熱透明フィルムで巻いて、その内側は太陽熱集熱用黒フィルムを入れています。
In the past several winters, we have taken a good care of the mother leaf (good luck leaf, miracle leaf), a subtropical plant from the Ogasawara Islands, and the Japanese rice-fish are added from this year on.
It is said that they can survive our winter that sometimes has minus degrees. But I don’t like the cold weather and neither do they, I think. The measures against cold should be needed especially for the newly born fish.
The outside of the aquariums are wrapped with the insulating transparent films with air layer between them and the inside a black burning film.