Giant trevally

Resident apex predator on Baa's channels and reef edges year-round, often hunting on current dives.

Giant trevally and other jacks hunt through the passes on the incoming tide, sometimes in fast-moving packs. Reliable in the pass drifts year-round.

Trevally school and hunt along the walls; giant trevally are common among them.

Year-round and current-dependent rather than season-dependent — they hunt where the flow concentrates baitfish, so the northern pinnacles and Batu Bolong on a running tide are the reliable places. Operators describe schools of fusiliers and trevally forming walls of silver in the current at Batu Bolong.

Schools in the channels, hunting in current.

Resident; most active as a hunter on night dives at sheltered sites such as Challenger Bay. Seen year-round, encounters vary.

Hunting on the currents at Nusa Penida and around the Liberty wreck.

Large trevally hunt along the wall faces at Mandolin and Sachiko's; some individuals are reported at 80kg-plus size.

Hunts along the current-swept drifts such as Halik, often with schooling snapper; occasional rather than resident.

Larger trevally hunt the exposed pinnacles, most often on the outer and offshore sites.

Hunts around the offshore pinnacles, often alongside schooling smaller jacks and mackerel at Sail Rock, Chumphon and Southwest.

Trevally hunt around the outer pinnacles and the wreck, most often on dives with some current.

Trevally and jacks school in the current at drift sites like The Canyons and the Verde Island drop-off. Most reliable where the current runs strong.

Schooling jacks are a regular feature of current-swept sites, with anecdotal reports of increased pelagic activity (tuna and jacks together) around September.

Hunts the reef edge (Sipadan closed in November).

Hunts around exposed sites like Torinla Pinnacle and Koh Chi, often with schooling barracuda and fusiliers.