Aquamarine Fukushima
This aquarium was opened in 2000 near Onahama Port. Its theme is the current rip where the two currents Kuroshio and Oyashio meet, which bring rich blessings to the sea of Fukushima.
I had only learned about the Oyashio and Kuroshio currents in textbooks, so it was really educational to actually see the marine environment up close.