Giant trevally

The Giant Trevally (ロウニンアジ, Rōnin'aji) is a fish that was introduced in. It is found exclusively on Tortimer Island year round in, or at the pier in. It sells for a high 4,500 Bells.

In
The information board in front of the tank that houses the giant trevally says the following:

In
Once donated, the giant trevally can be found in the north-east room of the fish exhibit, in the large central tank with the porthole windows. It will often swim near the glass wall, and sometimes will try to pierce the anchovy school, scattering them for a moment—it shares this behavior with many of the large fish also in this tank.

Real-world information
The giant trevally is a large fish located in the tropical waters of the Indo-Pacific region. It has a typical silver color, but males may turn black as they grow older.