[Genus Sardinella various species and Dussumieria acuta]
Tunsoy is the Philippine name for various Indo-Pacific herring. The photo specimen, from a package of salted and dried herring obtained from a Philippine market in Los Angeles, was rehydrated by soaking in water for 20 hours (yes it took that long to soften it up). It was 4-3/4 inches long and weighed 0.35 ounce rehydrated. This fish was eviscerated before drying in compliance with California health law.
More on the Herring Family.
For more on this dried fish and other fish similarly prepared, see our Daing / Tuyo page.