The Tama River runs through Tokyo. It's home to Ayu, the queen of freshwater streams. Every year 10 million of them go upstream to spawn. But many invasive species are intruding on their oasis now.

Amazing Comeback ― Ayu, Japan
Darwin's Amazing Animals
The Tama River runs through Tokyo. It's home to Ayu, the queen of freshwater streams. Every year 10 million of them go upstream to spawn. But many invasive species are intruding on their oasis now.
Tama River



Wikipedia
https://en.wikipedia.org › wiki › Tama_River





The Tama River (多摩川, Tama-gawa) is a major river in Yamanashi, Kanagawa and Tokyo Prefectures on Honshū, Japan. It is officially classified as a Class 1 ...