Small - sized koi varieties mainly include Kohaku koi and Medaka.
Kohaku koi is one of the most ornamental and eye - catching varieties among koi. Native to Japan, they are highly adaptable and can live in cold water and fresh water, making them very suitable for home breeding. Kohaku koi have a relatively long lifespan, with an average of about 70 years. They are gentle in nature and like to swim in groups. They are omnivorous, feeding on mollusks, fragments of higher aquatic plants, benthic animals, tiny algae, or synthetic pellet feeds. The sexual maturity of Kohaku koi is reached at 2 - 3 years old, and they spawn from April to May each year.
Medaka, also known as mini - koi, has a small body size. Adult Medaka are only 3 - 4 centimeters long. This fish has a wide variety of breeds and rich colors. It is very easy to raise and has a strong reproductive ability. Medaka is highly adaptable and can survive in various water quality conditions, making it suitable for beginners. They have a wide - ranging diet, and common fish feeds on the market can meet their nutritional needs.