In the northern wastes there is a Lake Shi, a thousand li on each side. The banks are over five zhang high (one zhang is c. 3.3m), and it is permanently frozen, thawing only for forty or fifty days in summer. There lives the Henggong Fish, seven to eight chi in length (more than 2 metres), shaped like a carp and red. In daytime they stay in the water, but at night take human form. Stabbing will not pierce them, boiling will not kill them. Only a fire of two dark plum branches will finish them off. Eating them will halt illness caused by malign influence.
Li Fang 李昉, et al., Taiping guangji 太平廣記 (Extensive Gleanings from the Era of Great Harmony), 10 vols (Beijing: Zhonghua shuju, 1961), x, 464.3822:
Zou Su, the Wine Supervisor for Zhengzou, was just and impartial in office, and respected by people for that. In Zhengzhou one day, as the sun reached noon, wind and hail descended from the heavens, mist and cloud arose from all four sides around the north gate, and a black miasma spun out of it and arose vertically, meeting the heavens without dissipating. A lidless copper coffin descended from the sky, and music came loud and clear out of the empty air. At that time all of Zhengzhou’s junior clerks below the rank of prefect, generals and officers, scholars and commoners, monks and Daoists all changed their clothes and tried to get into the coffin. It being narrow outside and wide within, however, none were able to enter. Winding his wine supervisor’s kerchief as he arrived, Su was asked by the crowd to enter the coffin, and he had not the slightest difficulty. A moment later, a copper lid descended, circled by multi-coloured clouds, and it was all then lifted among the beautiful sound of immortals and the voices of cranes, amid auspicious clouds of heavenly fragrance, and, in a cloud of enduring mist, the coffin gradually turned to the north and departed. He now serves as the judge over longevity in the distant north.
Anon., Huhai xinwen yijian xuzhi, 後1.150 (Tale 263):
Yuan Haowen 元好問, Chang Zhenguo 常振國 (ed), Xu Yijian zhi 續夷堅志 (Continued Records of the Listener), and Anon., Jin Xin 金心 (ed.), Huhai xinwen yijian xuzhi 湖海新聞夷堅續志 (Continuation of Records of the Listener with New Items from the Lakes and Seas) (Beijing: Zhonghua shuju, 1986).