However, in large lakes such as Lake Biwa and Lake Inawashiro, they often live only in their habitat of freshwater areas in the lakes and the rivers around the lakes until they migrate down to the sea for spawning.
しかし、琵琶湖や猪苗代湖等の大型湖沼では、産卵期に降海するまで棲息湖沼と周辺の河川の淡水域のみで生活することが多い。