Cyprinus rubrofuscus, commonly known as Koi, is a colorful freshwater fish known for its vibrant patterns and hues. Native to East Asia, Koi thrive in ponds and calm waters. They are social creatures, often seen in groups, and can live for decades, symbolizing longevity and good fortune.

The koi, scientifically known as Cyprinus rubrofuscus, is native to East Asia. Specifically, they are originally from the freshwater bodies of China and are also found in parts of Japan and the Korean Peninsula. Historically, they have been bred in Japan for ornamental purposes, leading to the diverse color patterns seen today.

Koi are typically found in temperate freshwater environments. They thrive in slow-moving or still waters such as ponds, lakes, and rivers with a moderate to warm climate. The ideal water temperature for koi ranges between 15°C and 25°C (59°F to 77°F), and they prefer water with a neutral to slightly alkaline pH.

As omnivorous fish, koi play a role in their ecosystem by feeding on a variety of plant material, algae, insects, and small aquatic organisms. They contribute to the control of aquatic vegetation and serve as prey for larger predators. In their natural habitat, koi are part of a complex aquatic ecosystem and have adapted to withstand a range of environmental conditions, but they are particularly sensitive to water quality and temperature changes.