Japanese koi are prized ornamental fish that are believed to date back to the early 19th century, according to the Smithsonian’s National Zoo & Conservation Biology Institute.

In recent years, koi have become hugely popular in Asia, with Japan’s koi exports doubling over the past decade to 6.3 billion yen ($43 million) — one-fifth of them shipped to China, the top ...

The pond houses an estimated 30 koi, colorful carp that are mainstays of Japanese gardens. Manito’s garden is named both for the Japan sister city, Nishinomiya, and Ed Tsutakawa, a longtime ...

Japanese koi are a type of carp frequently found in ornamental ponds. Biologists consider them an invasive nuisance when released to certain ecosystems because they live long, reproduce readily ...