Hai Collection, Middle Volume Radical: Fish (yú) Character: Tun Kangxi Stroke Count: 15 Page 1466, Entry 07 Wuyin Jiyun states: Pronounced tun. Yupian states: The name of a fish. Collected Explanations of Materia Medica (Bencao Jijie) states: The river pufferfish is shaped like a tadpole, growing to over a foot in length. Its back is bluish-white in color with yellow stripes. It lacks scales and gills, and it is poisonous when its eyes can open. It is also called houyi. It is also called huyi. It is also called fish. Originally written as tun.