Why Koi Fish Swim in Japan’s Street Gutters!
Quick Answer Koi swim in the street canals of Shimabara, Japan, because the water isn’t wastewater at all — it’s clean spring water. In 1792, the Unzen-Mayuyama disaster (Japan’s deadliest volcanic catastrophe, killing roughly 15,000 people) fractured the ground and created over 60 natural springs throughout the city. Nearly two centuries later, in 1978, residents