Shishamo (柳葉魚, literally "Willow Leaf Fish"), or Spirinchus lanceolatus, is an anadromous 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).

The total 2021 catch in Kushiro, where 85% of Japanese shishamo are caught, was 124 tons - a reduction of 50% compared to the year before.

Due to declining catches in recent years, attempts have been made to commercially farm the fish in Japan.

[5] In recent years capelin (Mallotus villosus) has appeared on the market with the name "Karafuto shishamo."