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Great Barrier Reef marine life

Trevally

Trevally are the reef’s fast hunters. Bigeye trevally gather in schools of hundreds that circle above a bommie in a slow, glittering column; giant trevally, the GT, patrol alone or in small packs and hit baitfish like a train. Both come close to divers.

  • Bigeye trevally to about 80 cm; giant trevally to 1.7 mSize
  • Year round; schools best in the current on outer reefsBest time
  • Least Concern (IUCN)Status
A school of bigeye trevally over the reef

Caranx spp.

Photo: Barry Coleman

What to look for

Deep, compressed silver bodies with a forked tail and a line of hard scutes along the rear of the lateral line. Bigeyes have, as the name says, a big eye and a small dark spot on the gill cover, and they school; giant trevally are heavier, darker and often alone. Trevally schools regularly circle a diver who stays still, close enough to feel the water move.

The hunt

Watch the edge of a fusilier school or a cloud of baitfish on the reef crest: the sudden explosion of silver is a trevally strike. Dawn and dusk are the busiest times. On the Port Douglas bommies the trevally, barracuda and reef sharks all work the same current points, which is why those sites deliver.

Where to see it

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All Great Barrier Reef marine life →