Wainai Sadayuki
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Wainai Sadayuki (和井内貞行? 1858–1922) was a pioneer known for his contributions to the development of Lake Towada in Akita Prefecture.
Born in Kazuno, Akita in 1858, Wainai initially began his career in 1881 in the mining industry, then the backbone of Kazuno's economy. However, in 1884, he attempted to cultivate fish farming in Lake Towada, which was at the time lifeless despite previous attempts to introduce fish. Persevering in the face of multiple setbacks and failures, Wainai finally succeeded in 1903 after a majority of trout fry he had released earlier survived. Today, thanks to Wainai's efforts, Princess trout (aka Himemasu) flourish in Lake Towada, making it a very popular fishing spot.
Wainai is also known for promoting Lake Towada as one of the top tourist destinations in Tōhoku by developing the lakeshore and by petitioning for the lake's recognition as a national park.
After his death in 1922, Wainai's remains were enshrined in the Wainai Shrine located near the lake in acknowledgment for his works.
