noun
giant trevally
A large marine fish (Caranx ignobilis) found in tropical waters. The Japanese name literally means 'rōnin horse mackerel'.
ロウニンアジは釣り人に人気の大物だ。
The giant trevally is a popular big-game fish among anglers.
Compound of 浪人 (rōnin, 'masterless samurai; wanderer') and 鯵 (aji, 'horse mackerel'). The name likely refers to the fish's solitary, wandering behavior or its large, imposing size.