The carp is a large group of fish originally found in Central Europe and Asia. Various carp species were originally domesticated in East Asia, where they were used as food fish. The ability of carp to survive and adapt to many climates and water conditions allowed the domesticated species to be propagated to many new locations including Japan. Natural color mutations of these carp would have occurred across all populations. Carp were first bred for color mutations in China more than a thousand years ago, where selective breeding of the Prussian carp (Carassius gibelio) led to the development of the goldfish. Both the "brocaded carp" and Kanji were first originated from ancient China. The fish was first recorded in Jin Dynasty, and became popular in Tang and Song dynasties. It became a literal element in Tang poems and Song Ci. Such as Tang poet Lu Guimeng once wrote "Wire bird Tibetan Lotus, Koi shadow around the island", the later half sentence literal means "brocaded carps are swimming around the shadow of the island". Carp are known as koi in Japan. Of the various domesticated carp species, the common carp (Cyprinus carpio) is one of the more commonly used in aquaculture. Common carp were first introduced into Japan by way of China between 400 to 600 years ago. Common carp were first bred for color in Japan in the 1820s, initially in the town of Ojiya in the Niigata prefecture on the north eastern coast of Honshu island. By the 20th century, a number of color patterns had been established, most notably the red-and-white Kohaku. The outside world was not aware of the development of color variations in koi until 1914, when the Niigata koi were exhibited in the annual exposition in Tokyo. At that point, interest in koi exploded throughout Japan. The hobby of keeping koi eventually spread worldwide.