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  • Dozens of giant trevally (Caranx ignobilis) schooling together at Peleliu Express dive site in Palau. This association behavior may be associated with spawning.
    giant-trevally-schooling-caranx-igno...tif
  • When small fish like basslets, damselfish and other reef residents appear in large numbers with the change of tide at Carl's Ultimate dive site in the Eastern Fields of Papua New Guinea, predators such as bluefin trevally gather in packs to hunt them. This trevally used me for camouflage to approach the swarms of small fish, then charged straight in front of me in an attempt to grab a meal.
    bluefin-trevally-Caranx-melampygus-h...tif
  • A group of bigeye trevally (Caranx sexfasciatus) swimming around a grey reef shark (Carcharhinus amblyrynchos), with one of the fish rubbing its body against the shark's skin. Bigeye trevallies and other species of fish engage in this activity from time to time, perhaps to remove parasites or other irritations from their skin. For the most part, the sharks do not seem to mind, though they sometimes take off at high speed. Note also that one of the bigeye trevallies is dark. The change in coloration is associated with reproduction. Photographed at Blue Corner in Palau.
    bigeye-trevally-rubbing-against-grey...tif
  • Close encounter with a large school of bigeye trevally (Caranx sexfasciatus) at the world-renowned Blue Corner dive site in Palau.
    bigeye-trevally-caranx-sexfasciatus-...tif
  • Red and orange soft coral (Dendronephthya sp.) in the Eastern Fields of Papua New Guinea, framed by a curtain of thousands of bigeye trevallies (Caranx sexfasciatus)
    soft-coral-bigeye-trevally-Caranx-se...tif
  • A school of bigeye jacks (Caranx sexfasciatus) moving across a shallow reef top, moving together en masse in order to take advantage of the concept of safety in numbers.
    bigeye-trevally-school-caranx-sexfas...tif
  • A pair of bigeye jacks (Caranx sexfasciatus), with the male temporarily turned black in preparation for spawning. Another pair of fish also getting ready to spawn is visible in the background. These fish were among a large school of several hundred jacks swimming above the Blue Corner dive site in Palau.
    bigeye-trevally-mating-spawning-blue...tif
  • Staghorn coral formation at Point P dive site in the Eastern Fields of Papua New Guinea, with a large school of bigeye trevallies (Caranx sexfasciatus) swimming overhead
    caranx-sexfasciatus-bigeye-trevally-...tif
  • School of Yellowstripe Scad (Selaroides leptolepis) swimming under the jetty at Samarai Island in Milne Bay, Papua New Guinea
    Selaroides-leptolepis-yellowstripe-s...tif
  • School of Yellowstripe Scad (Selaroides leptolepis) swimming under the jetty at Samarai Island in Milne Bay, Papua New Guinea, one fish with its mouth wide open.
    Selaroides-leptolepis-yellowstripe-s...tif
  • School of Yellowstripe Scad (Selaroides leptolepis) swimming under the jetty at Samarai Island in Milne Bay, Papua New Guinea
    Selaroides-leptolepis-yellowstripe-s...tif
  • School of Yellowstripe Scad (Selaroides leptolepis) swimming under the jetty at Samarai Island in Milne Bay, Papua New Guinea
    Selaroides-leptolepis-yellowstripe-s...tif
  • Enormous swarm of bigeye scad (Selar crumenophthlamus) swimming around the jetty at Air Manis dive site in Ambon, Indonesia
    Selar-crumenophthlamus-bigeye-scad-s...tif
  • Large school of bigeye scad (Selar crumenophthlamus) under the jetty at the Air Manis dive site in Ambon, Indonesia
    Selar-crumenophthlamus-bigeye-scad-s...tif
  • Large school of bigeye scad (Selar crumenophthlamus) under the jetty at the Air Manis dive site in Ambon, Indonesia
    Selar-crumenophthlamus-bigeye-scad-s...tif
  • This is a blacktip reef shark (Carcharhinus melanopterus) slicing through shallow water in pursuit of sardines, some of which can be seen jumping into the air to avoid being caught. This occurred in the early morning, usually commencing just before sunrise, when large schools of the baitfish gathered in shallow water. Several species worked together to herd and catch the fish. In the water, trevallies and blacktip reef sharks herded the fish, forcing them into concentrated groups. From the air, brown boobies and terns hovered. The predators coordinated their attacks, usually with trevallies making high-speed runs through the groups of fish. This caused panic, sending the sardines in every direction. Blacktip reef sharks then charged in, chasing sardines into shallow water and sometimes onto shore, while boobies and terns picked off fish at the surface, separated from the other fish. This action was rapid, often resulting in sweeping waves of panicked fish washing down the length of the shoreline. Here, the sun has just come up over the horizon. The action usually slowed down and stopped within 20-30 minutes after sunrise.
    blacktip-reef-shark-hunting-sardines...tif
  • This is a blacktip reef shark (Carcharhinus melanopterus) beaching itself to catch sardines. This occurred in the early morning, just before sunrise, when large schools of the baitfish gathered in shallow water. Several species worked together to herd and catch the fish. In the water, trevallies and blacktip reef sharks herded the fish, forcing them into concentrated groups. From the air, brown boobies and terns hovered. The predators coordinated their attacks, usually with trevallies making high-speed runs through the groups of fish. This caused panic, sending the sardines in every direction. Blacktip reef sharks then charged in and beached themselves, chasing baitfish onto shore, while boobies and terns picked off fish at the surface, separated from the other fish. This action was rapid, often resulting in sweeping waves of panicked fish washing down the length of the shoreline. Once the sun came up, the action slowed down and usually stopped within 20-30 minutes after sunrise.
    blacktip-reef-shark-hunting-sardines...tif
  • Pictured here are sardines (Clupeidae) fleeing from predators in the early morning. They were being herded and chased by trevallies and blacktip reef sharks in the water, and picked off by brown boobies and terns from the air. This coordinated hunting took place primarily before sunrise.
    sardines-fleeing-predators-tonga-201...tif
  • Pictured here are sardines (Clupeidae) fleeing from predators in the early morning. They were being herded and chased by trevallies and blacktip reef sharks in the water, and picked off by brown boobies and terns from the air. This coordinated hunting took place primarily before sunrise.
    sardines-fleeing-from-predators-tong...tif
  • Lesser frigatebird (Fregata aerial) patrolling the skies. There were terns picking up sardines that had been driven into shallow water and onto the beach by trevallies, blacktip reef sharks and other predators. Frigatebirds like this gathered overhead to swoop in, bully terns carrying fish, and steal their meals.
    lesser-frigatebird-fregata-aerial-20...tif
  • Pictured here are sardines (Clupeidae) fleeing from predators in the early morning. They were being herded and chased by trevallies and blacktip reef sharks in the water, and picked off by brown boobies and terns from the air. This coordinated hunting took place primarily before sunrise. Here, the sun was just peeking over the horizon.
    sardines-fleeing-from-predators-tong...tif
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