Brandon Cole / Crescent-tail bigeyes (Priacanthus hamrur), and Grey reef sharks (Carcharhinus amblyrhynchos). French Polynesia, Pacific Ocean.

Shane Gross / A juvenile soldierfish, possibly a Crescent-tail bigeye (Priacanthus hamrur) in the open ocean at night off Anilao, Philippines.

Georgette Douwma / Big-eye fish (Priacanthus hamrur). Egypt, Red Sea.

Jeff Rotman / Close up of Goggle eye / Bigeye fish (Priacanthus hamrur) Red Sea, Egypt

Georgette Douwma / Big-eye or Goggle-eye (Priacanthus hamrur) on wreck. Note colour change from deep red to silver. Egypt, Red Sea

Georgette Douwma / Bigeye / Goggle-eye (Priacanthus hamrur) showing colour change from deep red to silver. Sipadan, Malaysia.

Peter Scoones / Goggle eye / Common bigeye fish schooling {Priacanthus hamrur} Sipadan, Malaysia

Alex Mustard / Crescent-tail bigeye (Priacanthus hamrur) school on a coral reef, shot with a long exposure. North Male Atoll, Maldives. Indian Ocean

Pascal Kobeh / Small school of Common bigeye fish (Priacanthus hamrur), Indian Ocean, Maldives. November.

Magnus Lundgren / Juvenile Crescent tail bigeye (Priacanthus hamrur) on the open sea, Anilao Batangas Philippines Pacific Ocean.

Linda Pitkin / Bigeye fish (Priacanthus hamrur) by wreck of The Barge near Bluff Point, Gubal I., Gulf of Suez, Egypt, Red Sea.

Linda Pitkin / Bigeye fish (Priacanthus hamrur) The Barge (wreck), near Bluff Point, Gubal I., Gulf of Suez, Egypt, Red Sea.

Linda Pitkin / Bigeye fish (Priacanthus hamrur) night time colour Gordon Reef, Straits of Tiran, Egypt, Red Sea.

Jordi Chias / Lunar-tailed bigeye (Priacanthus hamrur) with blueline snappers (Lutjanus kasmira) in the background;Mozambique

Jordi Chias / Lunar-tailed bigeye (Priacanthus hamrur) school, Mozambique

Jordi Chias / Lunar-tailed bigeye (Priacanthus hamrur) Addu atoll, Maldives, Indian Ocean.

Alex Mustard / Crescent-tail bigeye (Priacanthus hamrur) shelters next to hard coral (Porites sp.). Beacon Rock, Sha'ab Mahmood, Sinai, Egypt. Red Sea.

Georgette Douwma / Big-eye or Goggle-eye (Priacanthus hamrur) and Crown squirrelfish (Sargocentron diadema) on wreck colonised by corals, Red Sea, Egypt. January.

Alex Mustard / Crescent-tail bigeye (Priacanthus hamrur) on the drop off of Little Brother Island, Egypt. Red Sea

Georgette Douwma / Big-eye or Goggle-eye (Priacanthus hamrur) with some changing colour from silver to bright red and back again. Andaman Sea, Thailand.

Franco Banfi / Crescent-tail bigeye (Priacanthus hamrur) Crystal Bay, Nusa Penida, Bali Island, Indonesia, Pacific Ocean.

Georgette Douwma / Big-eye fish (Priacanthus hamrur). Egypt, Red Sea.

Georgette Douwma / Big-eye fish (Priacanthus hamrur). Egypt, Red Sea.

Georgette Douwma / Big-eye fish (Priacanthus hamrur). Egypt, Red Sea.

Georgette Douwma / Big-eye fish (Priacanthus hamrur). Egypt, Red Sea.

Georgette Douwma / Big-eye fish (Priacanthus hamrur). Egypt, Red Sea.

Georgette Douwma / Big-eye or Goggle-eye (Priacanthus hamrur). Egypt, Red Sea.

Brandon Cole / Crescent-tail bigeye (Priacanthus hamrur), schooling Bluestreak fusiliers (Pterocaesio tile), Blue and yellow fusiliers (Caesio teres). Komodo National Park, Indonesia, tropical Pacific Ocean.

Brandon Cole / Crescent-tail Bigeyes (Priacanthus hamrur), schooling Bluestreak fusiliers (Pterocaesio tile), and Chromis (Chromis sp.). Komodo National Park, Indonesia, tropical Pacific Ocean.

Franco Banfi / Scuba diver with Zaizer's bigeye (Priacanthus hamrur), Aldabra Atoll, Natural World Heritage Site, Seychelles, Indian Ocean.

Pascal Kobeh / Common bigeyes (Priacanthus hamrur) on a hard coral reef with (Acropora) and (Porites) Palau. Philippine Sea.

Alex Mustard / Portrait of Crescent-tail bigeye (Priacanthus hamrur) yawning. Gubal Island, Egypt. Strait of Gubal, Gulf of Suez, Red Sea.

Alex Mustard / Crescent-tail bigeye (Priacanthus hamrur) portrait against blue water. Note there is cleaner wrasse in attendance (below mouth), Gubal Island, Egypt. Red Sea.

Solvin Zankl / Five Moontail bullseye / Goggle eye (Priacanthus hamrur) four orange, one silver, Raja Ampat, West Papua, Indonesia, Pacific Ocean.

Roberto Rinaldi / Moontail bullseye (Priacanthus hamrur) in front of a big gorgonian seafan (Subgorgia hicksoni), Reunion Island, Indian Ocean.

Georgette Douwma / Big-eye or Goggle-eye (Priacanthus hamrur) on coral reef. Egypt, Red Sea.

Georgette Douwma / Big-eye or Goggle-eye (Priacanthus hamrur) on coral reef. Egypt, Red Sea.

Georgette Douwma / Big-eye or Goggle-eye (Priacanthus hamrur) on coral reef. Egypt, Red Sea.

Jeff Rotman / Close up of Goggle eye / Bigeye fish (Priacanthus hamrur) Red Sea, Egypt

Jeff Rotman / Close up of Goggle eye / Bigeye fish (Priacanthus hamrur) Red Sea, Egypt

Georgette Douwma / Bigeye or Goggle-eye (Priacanthus hamrur) large school over reef. Egypt, Red Sea.

Georgette Douwma / Shoal of Big-eye or Goggle-eye (Priacanthus hamrur) on wreck. Egypt, Red Sea.

Georgette Douwma / Big eye / Goggle eye fish (Priacanthus hamrur) large shoal over reef, Egypt, Red Sea

Georgette Douwma / Big-eye / Goggle-eye fish (Priacanthus hamrur) shoal on wreck, Egypt, Red Sea

Georgette Douwma / Big-eye or Goggle-eye (Priacanthus hamrur). Can change colour from deep red to silver. Egypt, Red Sea

Georgette Douwma / Big-eye / Goggle-eye (Priacanthus hamrur). Can change colour from deep red to silver. Egypt, Red Sea

Georgette Douwma / Two Big-eye / Goggle-eye (Priacanthus hamrur) on coral reef, Egypt, Red Sea

Georgette Douwma / Big-eye / Goggle-eye (Priacanthus hamrur) on coral reef, Egypt, Red Sea