Nakagawa Aquatic Park

Nakagawa Aquatic Park (栃木県なかがわ水遊園) is an aquarium attached to the Tochigi Prefectural Fisheries Experiment Station, located on the banks of the Naka River in Sarado, Otawara, Tochigi Prefecture, Japan. Although saltwater fish are also kept here, the public aquarium is mainly for freshwater fish. The aquarium opened on July 15, 2001. The aquarium is accredited as a Museum-equivalent facilities by the Museum Act from Ministry of Education, Culture, Sports, Science and Technology.

Exhibits
Located on the banks of the Naka River and the Broom River, two of the Kanto region's representative clear streams where sweetfish run upstream, it has an "Omoshiro sakana museum" that exhibits a variety of fish, a park, an observation deck, a fish encounter station, and other facilities.

The aquarium displaying tropical fish from the Amazon River tank is the one of Japan's largest tank dedicated to freshwater fish. Other exhibits include freshwater fish exhibits for each basin of the Naka River, which simulate the upstream and downstream areas of the river, various Japanese freshwater fish, tropical saltwater fish, an aquarium where visitors can touch and feel the fish, and an exhibition area for rare Japanese fish.