Anomaly Ledger

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Akugyo

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Painted illustration: enormous dark fish beneath stormy Japanese coastal waves, ukiyo-e inspired painting
AI rendition based on witness descriptions, not an actual photo.
"Yamato Takeru and monster fish" (日本武尊悪魚を退治す) from the Konpira-sankei-meisho-zue (金毘羅参詣名所図会)
"Yamato Takeru and monster fish" (日本武尊悪魚を退治す) from the Konpira-sankei-meisho-zue (金毘羅参詣名所図会) · Urakawa Kōsa (浦川公佐, Japanese) · Public domain (via Wikimedia Commons) · Image source

A Japanese sea monster or aquatic yōkai, the 'evil fish' or giant fish of old tales.

Folklore Verdict: A yōkai of Japanese legend rather than a reported animal.

Region
Oceans · Japan (coastal waters)
First reports
Japanese mythology

Key sightings

Best evidence

Stories and tradition only; no physical evidence.

Sources