noun
double-lined mackerel
A species of mackerel (Grammatorcynus bilineatus) found in tropical waters. The name is usually written in kana.
沖縄ではにじょうさばが釣れることがある。
In Okinawa, double-lined mackerel can sometimes be caught.
The name likely derives from the two dark lines along the body (二条) and the mackerel family (鯖). The exact origin is uncertain.