Koi

Koi (Cyprinus rubrofuscus) are a type of ornamental carp that have been selectively bred for their vibrant colors and striking patterns. Originally from East Asia, koi are now cherished worldwide, especially in Japan, where they are considered symbols of luck and prosperity. These fish can display an array of colors, including white, black, red, yellow, blue, and cream, making them a popular choice for outdoor ponds. Koi can grow much larger than typical aquarium fish, with some reaching over 90 cm in length.

Due to their size and active nature, koi are best suited for outdoor ponds rather than aquariums. A pond allows them to grow to their full size, swim freely, and exhibit their natural behaviors. The ideal temperature range for koi is 15-25°C, and they can tolerate temperatures as low as 10°C during colder months. In an aquarium, koi may become stressed and stunted as they require much larger spaces, ideally 1,000 liters or more per fish.