Refers specifically to Engraulis japonica, a small fish used in Japanese cuisine. Often contrasted with カタクチイワシ (片口鰯).
See also: カタクチイワシ (かたくちいわし)
Japanese anchovies are used to make niboshi and chirimen jako.
Japanese anchovies are often caught around here.
Standard katakana spelling for this fish name.
Rare kanji spelling; the word is usually written in kana.
The origin of シコ is uncertain; it may be a regional or old name for this fish. イワシ means sardine/anchovy.