Crescent-tail Bigeye (Priacanthus hamrur): Bigeyes, also called Goggleyes or Bullseyes are nocturnal. Hence the especially large eyes to make the most of the dim light. During the day they hang suspended off the reef face often with their mouths open filtering-out the zooplankton and fish larva swept in by the ocean currents. As daylight fades they start feeding on bottom-dwelling invertebrates like crustaceans. Growing to 35 cm, Bigeyes are mostly seen in their red livery but they can rapidly change colour to plain silver, or when the mood takes them silver and red bars.