Tradition / Region: Japanese Mythology
Alternate Names: Mermaid, human-fish
Category: Mermaid
The Myth
The Ningyo is a mysterious aquatic creature believed to inhabit the sea, rivers, and other bodies of water. It is commonly described as a being with a human head and a fish’s body, although its appearance varies between accounts. Some depictions resemble creatures that are half-human and half-fish, while others portray a fish with a human face. Over time, the influence of Western stories and imagery contributed to the familiar depiction of the Ningyo as a beautiful woman with a fish’s tail.
In Japanese tradition, sightings and captures of Ningyo were sometimes regarded as extraordinary events. One early account describes human-like creatures appearing in a river in Ōmi Province in 619. Another tells of fishermen in Settsu Province catching an unknown creature that was neither entirely fish nor human. Such beings were also described in later tales, including an account of a fish with a human-like head caught in a fisherman’s net in Ise Province.
According to the latter story, the creature behaved remarkably like a human. When people approached, it made sounds and shed tears. The local inhabitants cut off and ate some of its flesh, which was said to taste exceptionally good. Nothing unusual happened to those who ate it, and the account presented this as an example of what a Ningyo might be like.
Ningyo were sometimes considered valuable enough to be presented to powerful rulers. Their appearances could also inspire religious ceremonies and prayers, particularly when they were interpreted as warnings of coming disasters. In some traditions, a Ningyo’s arrival was considered an omen of war, storms, earthquakes, or other calamities.
One account describes a Ningyo washing ashore at Akita in 1213. Divination interpreted its appearance as a sign of impending military conflict, and prayers were performed in Kamakura. In another story, a Ningyo was discovered in Tsugaru in 1247, prompting further religious observances. These events were associated with political unrest, reinforcing the belief that the creatures could foretell upheaval.
Other legends connected Ningyo with natural disasters. A story from Wakasa Province tells of a fisherman who killed a Ningyo, after which violent storms and a great earthquake devastated a village. The creature was regarded as a messenger of the deity Asami Myōjin. Such accounts suggest that harming a Ningyo could bring terrible consequences upon those responsible.
Not every Ningyo was considered an ill omen, however. A tradition associated with Ryūgū-ji, the Dragon Palace Temple in Fukuoka, tells of a Ningyo that washed ashore at Hakata in 1222. Divination interpreted its arrival as a sign of the nation’s enduring prosperity. The creature was believed to be a messenger from the Dragon Palace beneath the sea, and a structure built to bury it eventually became associated with the temple’s name.
Ningyo also appear in Buddhist legends. One story associated with Kannonshō-ji Temple in Ōmi Province tells of a fisherman who was reborn as an ugly Ningyo because of the killing of living creatures in his previous life. The temple was said to have been established following his plea for salvation. This tradition portrays the creature as a being suffering the consequences of its former actions and seeking spiritual liberation.
Perhaps the best-known legend associated with Ningyo is that of Yao Bikuni, the Eight-Hundred-Year-Old Buddhist Nun. According to the story, a woman gained extraordinary longevity after eating Ningyo flesh. Her tale helped establish the belief that consuming the creature could grant a long life, even though other traditions associated Ningyo with misfortune and disaster.
From the early modern period onward, Western ideas increasingly influenced Japanese depictions of Ningyo. Illustrations of beautiful women with fish-like lower bodies became more widespread. At the same time, fabricated Ningyo specimens were displayed as curiosities, often made by joining the bodies of fish and monkeys. Their promoters sometimes claimed that eating the flesh would extend one’s life or that merely looking at the creature could protect against epidemics. Specimens and mummified figures were also sold as souvenirs, including to visitors from overseas.
The Ningyo occupies an uncertain place in Japanese folklore. Its appearance could signal prosperity or disaster, its flesh was believed to grant longevity, and its presence could inspire both reverence and fear. Whether encountered as a strange creature from the water, a messenger of the Dragon Palace, or a being seeking salvation, the Ningyo reflects the many ways in which Japanese traditions connected the mysteries of the aquatic world with human fate.
Sources
tyz-yokai.blog.jp contributors. (n.d.). Ningyo. In tyz-yokai.blog.jp, from https://tyz-yokai.blog.jp/archives/1077741608.html