Hikari-mono

“Hikari-mono” refers to blue-backed fish such as horse mackerel (aji), mackerel (saba), Pacific saury (sanma), sardine (iwashi), and shad (kohada). These fish are named hikari-mono because their skins appear shiny.

*“Hikari-mono” is written as "光り物" in Japanese.
　"光り" (hikari) means “glow, shiny”, and "もの" (mono) means “object”.