Hai Collection, Middle Volume. Radical: Fish (yú). Kangxi strokes: 17. Page 1469, Entry 15. Pronounced tong. Explaining the Characters (Shuowen): The name of a fish. Another theory suggests it is the snakehead fish. Erya: Explaining Fishes (Erya Shiyu): The jian is the large tong, and the small one is called the du. Commentary: It is indeed the snakehead fish. The large ones are called jian, and the small ones are called du. Categorized Essays (Leipian): Sometimes also written in a variant form. Also pronounced chong (rising tone). Also pronounced chong (level tone). The meaning remains the same. Also pronounced zhou. Tongyang, the name of a county. History of the Former Han Dynasty (Qian Han Shu): Geography Treatise: Tongyang County, Runan Commandery. Annotation: Ying Shao explains: It is located to the north of the Tong River. According to the Proper Character Guide (Zhengzitong), citing the commentary of Meng Kang in the History of the Han (Han Shu): The pronunciation of tong is zhou followed by hong. Zuo Tradition (Zuo Zhuan): Year Four of Duke Xiang, annotation: South of Tongyang County, tong is pronounced zhou. Book of the Later Han (Hou Han Shu): Yin Xing's son, Qing, was enfeoffed as the Marquis of Tongyang. Annotation: tong is pronounced zhou. Sun Mian's Eastern Rhymes (Dong Yun) collects the character tong, including the pronunciations zhimeng and zhiliu. These geographic annotations incorrectly omit the characters hong fan after zhou. Dai Tong established the pronunciations as tuhong and zhuanyong. The Supplement to the Rhyme Collection (Yunhui Bu) designates it as the zhong sound, which is based on changing zhou hong to the rising tone. Based on this, the zhilong pronunciation in Explaining the Characters (Shuowen), the zhou sound in the Summary of the Six Scripts (Liushu Lue), and the inclusion in the Correct Rhymes (Zhengyun) are all considered incorrect.