Takao Yaguchi (矢口高雄, Yaguchi Takao; 28 October 1939 – 20 November 2020), real name Takao Takahashi (髙橋 髙雄, Takahashi Takao), was a Japanese manga artist. He specialized in manga with ecological messages. His most famous manga was Fisherman Sanpei, which won the Kodansha Children's Manga Award in 1974.
Source: “Takao Yaguchi”, English Wikipedia (CC BY-SA 4.0), excerpt