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  • A squadron of grey reef sharks (Carcharhinus amblyrhynchos) swimming in formation. A healthy population of sharks like this is a relatively rare sight these days, given intensive hunting of sharks for the shark fin trade.
    grey-reef-sharks-carcharhinus-amblyr...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
  • Grey reef shark (Carcharhinus amblyrhynchos) patrolling the reef at Blue Corner dive site in Palau
    grey-reef-shark-carcharhinus-amblyrh...tif
  • Red coral formation at 40 metres depth, with silhouette of lone grey reef shark patrolling in the background
    red-coral-grey-reef-shark-ashmore-re...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
  • Thousands of spawning Lutjanus bohar snapper attract a number of predators, such as this blacktip shark (Carcharhinus limbatus) swimming through at rapid speed. Clouds of sperm and eggs and low light in the early morning result in low visibility, making ambush easy.
    carcharhinus-limbatus-blacktip-shark...tif
  • Female grey reef sharks (Carcharhinus amblyrhynchos) with visible scarring from mating activity. During the mating season, many female sharks appear with scars like this, inflicted by amorous male sharks. Mating is a rough affair among sharks, ften with multiple males biting and holding on to female sharks. Photographed at Blue Corner dive site in Palau.
    grey-reef-shark-mating-scars-carchar...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
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Tony Wu Underwater Photography

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