十和田湖とヒメマス
日本には「水清ければ魚棲まず」ということわざがあります。カルデラ湖である十和田湖には周りの斜面からの流入がほとんどないので、水中で豊かな食物連鎖を維持するのに必要な栄養素が足りません。また、十和田湖から唯一流れ出る奥入瀬川は、高い滝が下流からやってくる魚をせき止めています。しかし、1905年にコカニーサーモンとしても知られるヒメマスの養殖が開始され、湖に生息するようになりました。ヒメマスは澄んだ湖の栄養素の少ない水の中でも健康に育つことができます。
Title Lake Towada and Himemasu Salmon
- Aomori
- Akita
- Iwate
- Topic(s)：
- Cuisine/Food Culture $SETTINGS_DB.genreMap.get($item) National Parks/Quasi-National Parks
- Medium/Media of Use：
- App, QR code, etc.
- Text Length：
- ≤250 Words
- FY Prepared：
- 2018
- Associated Tourism Board：
- Towada-Hachimantai National Park
- Associated Address：
- Towadakohanyasumiya, Okuse, Towada-shi , Aomori
English
Lake Towada and Himemasu Salmon
There is a Japanese saying, “If the water is clear, it is devoid of fish.” Lake Towada is a caldera lake that receives very little runoff from the surrounding slopes, so the waters are poor in the nutrients required to support a rich aquatic food chain. To make matters worse, the only exit from Lake Towada is the Oirase River, which has a high waterfall that prevents fish from reaching the lake from downstream. Today, however, the lake is inhabited by himemasu, landlocked salmon also referred to as kokanee, which have been cultivated here since 1905. The kokanee are able to thrive even in the Lake’s clear and nutrient-poor water.
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