Zi Collection, Page Position: Lower. Radical: Child (zǐ). According to the Compilation of Rhymes (Jiyun), the pronunciation is xu (falling tone). According to the Classified Dictionary (Leipian), the pronunciation is also xu (falling tone). The standard reading is xu (falling tone). The Classic of Mountains and Seas (Shanhaijing) records that in Chai Mountain there is a fish called kanxu, which is shaped like a Kuafu but possesses the tail of a pig. Another tradition suggests that this term refers to fish eggs. It is often incorrectly written in folk usage as the variant form (yu).