THICKLIPPED JACK juvenile
Pseudocaranx dentex (Bloch & Schneider, 1801)
    Look carefully between the Yellowfin Goatfish in the upper photo and you'll see a juvenile Thicklipped Jack. Adults of this species are plain silvery gray, but juveniles and subadults sport a yellow stripe from eye to tail. Smaller juveniles appear to have a yellow tail and faint vertical bars as well, as in this photo. Evidently, these young jacks like to mingle with schooling goatfish. I have a photo of the same phenomenon taken just outside of Hanauma Bay, O`ahu, at about 50 ft. Hanging out with goatfish could be a tactic to ambush prey, or (more likely in my view) they school with goatfish because they can't find any of their own kind. Like several other jack species, Thicklipped Jacks school by day and hunt by night. They are most common in the cooler Northwestern Hawaiian Islands. Occasionally, though, young ones are encountered around the main Hawaiian Islands.