Shishamo (柳葉魚, literally "Willow Leaf Fish"), or Spirinchus lanceolatus, is an anadromous fish (smelt) native to Hokkaido, Japan.
The fish is said to resemble a willow leaf, and its Japanese name reflects this; shishamo, is derived from the Ainu name for the same fish, susam, which is supposed to be derived from a compound of Ainu susu "willow" + ham "leaf", hence its name in Chinese characters (柳葉魚 jukujikun, where the characters have no phonetic relation to the word).
This fish averages 15 centimeters in length, with a maximum recorded length of 70 cm. It is generally dark on the back with a silver-white underside.
