The story of a carp passing the Dragon Gate and becoming a dragon is one of the best-known images associated with koi. It comes from Chinese folklore and has influenced wider East Asian art and cultural interpretation.
The Story of the Ascent
In familiar retellings, carp struggle upstream toward a formidable gate or waterfall. Passing it brings transformation into a dragon. Details differ among versions: the emphasis may be the journey, the difficult crossing, or the reward after persistence.