Copyright © Motoi Ichihara The Dace Run OLYMPUS E-1 ZUIKO DIGITAL ED 50-200mm, F8.0 1/800sec. ISO100, -0.3EV When April arrives, you can see Japanese dace on their annual run up the Adogawa River, the Shiriuchi River and many other rivers that flow into Lake Biwa. Every time I see fish swimming vigorously upstream in rivers that were once polluted with agricultural and other chemicals, I say a prayer for nature's ongoing and vigorous survival.