The report of Juddo on Oki island in 18th century Cyoseitakesimakiwas published by Yada Takamasa, who was a Shinto priest of Unyou temple. He heared about fishery experiment in Juddo from Tubaki Gizaemon who was also worked in Unyou temple as a fisherman. But the experience story is not also Tubaki's. Tubaki heared the story from Itaya Nanibei. After all Yada edited hearsay story about fishery experiment in Juddo. Because of the characteristic of hearsay, This book distorted the facts by Yada's intention. But we can understand of the recognition about Juddo in that centry by study of the reason why Yada distorted the fact. First, About Tubaki made a voyage to Juddo or not. We can consider the possibility by the same expression he used in the description about the voyage to the Oki and to the Juddo. He says like that the voyage was so hard but the island was a good fishing banks. But that times, the voyage to the Juddo was already prohibited. So Yada could not recognize the voyage openly. In introduction, he says "It is a very shameful thing to write about the voyage to the Juddo." But on the other hand, he was disappointed about the forbidden. In past time, Japanese fisherman made a fortune through the fishery at the Juddo island. This regret was appeared well in this phrase "The Juddo still invites us, it will be forever." Yada published this book based on the desire, Someday the treasure islands (Takesima /Matusima) will be Japanese islands again.