Ulua la'uli--Black Jack or Trevally

Rich and I see these occasionally at Kahalu'u. They are usually solitary.

Jacks of the genus Caranx, often called trevallies, have prominent scutes—a line of strengthened scales that reinforce the tail. The scutes of the Black Trevally, or Black Jack, are especially easy to see. These jacks vary from almost black to dull gray, but the scutes are always dark. There is a dark spot on the upper gill cover. The species occurs singly or in pairs, typically along steep dropoffs adjacent to deep water.