Alex Mustard / Black and white photo of school of Bigeye trevally (Caranx sexfasciatus) form a circular shoal in open water, on the drop off of a coral reef. Ras Mohammed National Park, Sinai, Egypt. Red Sea. Highly...

Alex Mustard / Portrait of Green turtle (Chelonia mydas). Ras Mohammed National Park, Sinai, Egypt. Red Sea

Alex Mustard / Napoleon wrasse (Cheilinus undulatus) on a coral reef. Ras Mohammed National Park, Sinai, Egypt. Red Sea

Alex Mustard / Planktonic pyrosome, drifting in blue sea. Ras Mohammed National Park, Sinai, Egypt. Red Sea

Alex Mustard / Eye of a Masked butterflyfish (Chaetodon semilarvatus). This species is endemic to the Red Sea. Ras Mohammed National Park, Sinai, Egypt. Red Sea

Alex Mustard / Bluestreak cleaner wrasse (Labroides dimidiatus) cleans among the sharp teeth of a predatory roving coral grouper (Plectropomus pessuliferus) beneath an overhang on a coral reef. Ras Mohammed National...

Alex Mustard / Hawksbill turtle (Eretmochelys imbricata) male swims infront of a sunburst, near a coral reef. Ras Mohammed National Park, Sinai, Egypt. Red Sea

Alex Mustard / A colourful coral pinnacle, with orange scalefin anthias (Pseudanthias squamipinnis) swarming over red and orange soft corals (Dendronephthya sp. and Scleronephthya sp.) and hard corals, in a current....

Alex Mustard / Yellow cabbage coral (Turbinaria reniformis) growing on a coral reef, surrounded by scalefin anthias: Pseudanthias squamipinnis. Ras Mohammed National Park, Sinai, Egypt. Red Sea

Alex Mustard / A school of mackerel (Scombridae) and a diver alongside a coral reef wall. Ras Mohammed National Park, Sinai, Egypt. Red Sea

Alex Mustard / Colourful coral reef scene with Scalefin anthias (Pseudanthias squamipinnis), soft corals (Dendronepthya sp.) and hard corals (Acropora sp.). Ras Mohammed National Park, Sinai, Egypt. Red Sea

Alex Mustard / Colourful coral reef wall, with orange Scalefin anthias (Pseudanthias squamipinnis) swarming over red soft corals (Dendronephthya sp.) in a current. Ras Mohammed National Park, Sinai, Egypt. Red Sea

Alex Mustard / Diver explores a colourful coral reef with soft corals (Dendronephthya sp.) and Scalefin anthias (Pseudanthias squamipinnis). Ras Za'atar, Ras Mohammed National Park, Sinai, Egypt. Red Sea

Alex Mustard / Hawksbill turtle (Eretmochelys imbricata) swimming down to a coral reef after taking a breath at the surface. Ras Mohammed National Park, Sinai, Egypt. Red Sea.

Alex Mustard / Hawksbill turtle (Eretmochelys imbricata) feeding on Red soft coral (Dendronepthya sp.) growing on a coral reef. Ras Mohammed National Park, Sinai, Egypt. Red Sea.

Alex Mustard / Hawksbill turtle (Eretmochelys imbricata) feeds on red soft coral (Dendronepthya sp.) growing on a coral reef. Ras Mohammed National Park, Sinai, Egypt. Red Sea.

Alex Mustard / Hawksbill turtle (Eretmochelys imbricata) swims along a coral reef with pink soft coral (Dendronepthya sp.). Ras Mohammed National Park, Sinai, Egypt. Red Sea.

Alex Mustard / Bigeye trevally (Caranx sexfasciatus) forming a circular shoal in blue water, on the drop off of a coral reef. Ras Mohammed National Park, Sinai, Egypt. Red Sea

Alex Mustard / Green turtle (Chelonia mydas) with a diver on a coral reef. Ras Mohammed National Park, Sinai, Egypt. Red Sea

Alex Mustard / Diver exploring a colourful coral reef with soft corals (Dendronephthya sp.) and Scalefin anthias ( Pseudanthias squamipinnis). Ras Za'atar, Ras Mohammed National Park, Sinai, Egypt. Red Sea

Linda Pitkin / Coral reef with Anthias fish (Pseudanthias squamipinnis), and soft corals, (Dendronephthya sp.) Shark Reef to Jolande, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Coral reef with Anthias fish (Pseudanthias squamipinnis), and Fire coral (Millepora dichotoma) Anemone City, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Coral reef with Anthias fish (Pseudanthias squamipinnis), and Fire coral (Millepora dichotoma) Shark Reef to Jolande, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Bluespotted ribbontail ray (Taeniura lymma) Jolande Reef, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Bluespine unicornfish (Naso unicornis) Shark Reef to Jolande, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Bluespine unicornfish (Naso unicornis) Shark Reef to Jolande, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Bluefin trevally (Caranx melampygus) mixed-species foraging and hunting behaviour, with Giant moray (Gymnothorax javanicus). Shark Reef to Jolande, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Blue triggerfish (Pseudobalistes fuscus) Shark Reef to Jolande, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Blue triggerfish (Pseudobalistes fuscus) Shark Reef to Jolande Reef, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Bigeye emperor fish (Monotaxis grandoculis) Ras Ghozlani, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Anthias fish (Pseudanthias squamipinnis), by Fire coral (Millepora dichotoma) and soft coral, on coral reef, Shark Reef to Jolande Reef, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Anthias fish (Pseudanthias squamipinnis), by Fire coral (Millepora dichotoma) on coral reef, Shark Reef to Jolande Reef, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Yellowbar angelfish (Pomacanthus maculosus) on coral reef, with Anthias (Pseudanthias squamipinnis) Shark Reef to Jolande, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Yellow boxfish (Ostracion cubicus) Shark Reef to Jolande, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Whitespotted puffer (Arothron hispidus) on coral reef, Jackfish Alley, Ras Mohammed NP, Egypt, Red Sea.

Linda Pitkin / Whitespotted puffer (Arothron hispidus) on coral reef, Shark Reef to Jolande, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Whitespotted puffer (Arothron hispidus) on coral reef, Shark Reef to Jolande, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Stony coral (Porites sp.) with Anthias (Pseudanthias squamipinnis) Ras Ghozlani, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Stony coral (Porites sp.) with Anthias (Pseudanthias squamipinnis), and diver Ras Ghozlani, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Red Sea steephead parrotfish (Heavybeak parrotfish) Chlorurus gibbus, on coral reef Shark Reef to Jolande, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Orbicular batfish / Spadefish (Platax orbicularis), school Shark Reef to Jolande, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Masked butterflyfish (Chaetodon semilarvatus), pair sheltering under table coral (Acropora) Shark Reef to Jolande, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Magnificent sea anemones (Heteractis magnifica) with Three-spot dascyllus / Dominos (Dascyllus trimaculatus), and Two-banded anemonefish (Amphiprion bicinctus) Anemone City, Ras Mohammed National Park...

Linda Pitkin / Wreckage colonised by soft corals, stony corals, and fire coral Jolande wreck, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Wreckage colonised by soft corals, stony corals, and fire coral, with divers Jolande wreck, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Humphead wrasse (Cheilinus undulatus) on coral reef. Shark Reef to Jolande, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Coral reef with anthias (Pseudanthias squamipinnis), and soft corals, (Dendronephthya sp.) Shark Reef to Jolande, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Coral reef with Fire coral (Millepora dichotoma) and anthias (Pseudanthias squamipinnis) Ras Ghozlani, Ras Mohammed National Park, Egypt, Red Sea.

Alex Mustard / Shoal of a Red Sea soldierfish (Myripristis murdjan) and Sixbar grouper (Cephalopholis sexmaculata) shelter in a coral filled cave. Ras Mohammed National Park, Sinai, Egypt. Red Sea.

Alex Mustard / Whitebelly damselfish (Amblyglyphidodon leucogaster) pair spawning / laying eggs on a seafan (Annella mollis). Ras Mohammed National Park, Sinai, Egypt. Red Sea.

Alex Mustard / School of Bohar snapper (Lutjanus bohar) swimming in formation along a coral reef. These fish are usually solitary and aggregate each summer in the Red Sea to spawn. Ras Mohammed National Park, Sinai...

Alex Mustard / Colourful coral reef wall, with orange Scalefin anthias (Pseudanthias squamipinnis) swarming over pink and orange soft corals (Dendronephthya hemprichi)and( Dendronephthya klunzingeri) in a current. S...

Alex Mustard / Colourful coral reef with Soft corals (Dendronephthya sp.) and Scalefin anthias (Pseudanthias squamipinnis). Ras Zat'ar, Ras Mohammed National Park, Sinai, Egypt. Red Sea.

Alex Mustard / Scalefin anthias (Pseudanthias squamipinnis) shoal in front a coral reef, to feed on zooplankton brought to the reef by the current. Ras Mohammed National Park, Sinai, Egypt. Red Sea.

Bertie Gregory / Toilet cargo from the wreck of the Yolanda, Ras Mohammed National Park, Northern Red Sea, Februray 2016

Miles Barton / Gateway to Ras Mohammed NP, Sinai Peninsula, Egypt

Roberto Rinaldi / A school of anthias (Anthias sp) swimming over soft coral reef on the impressive wall of Ras Mohammed, protected by the Ras Mohammed National Marine Park, southern Sinai Peninsula, Egypt

Alex Mustard / Yellowbar angelfish (Pomacanthus maculosus) in open water, portrait, Ras Mohammed National Park, Sinai, Egypt. Red Sea.

Alex Mustard / Peacock grouper (Cephalopholis argus) with fishing line caught in its mouth, Ras Mohammed National Park, Sinai, Egypt. Red Sea.

Alex Mustard / Coral grouper (Cephalopholis miniata), most likely a male, on a coral reef, portrait, Ras Mohammed National Park, Sinai, Egypt, Red Sea.

Alex Mustard / Bluespine unicornfish (Naso unicornis) shoal gathering in a spawning aggregation above a coral reef, Ras Mohammed National Park, Sinai, Egypt, Red Sea.

Alex Mustard / School of Scalefin anthias (Pseudanthias squamipinnis) females, swimming around Fire coral (Millepora dichotoma) feeding on plankton brought to the reef by currents, Ras Mohammed National Park, Sinai,...

Alex Mustard / School of Yellow-spotted trevally (Carangoides orthogrammus) swimming in open water near a coral reef, Ras Mohammed National Park, Sinai, Egypt, Red Sea.

Alex Mustard / Red Sea bird wrasse (Gomphosus caeruleus klunzingeri) male, swimming excitedly above a coral reef during courtship, Ras Mohammed National Park, Sinai, Egypt, Red Sea.

Alex Mustard / Scrawled filefish (Aluterus scriptus) sheltering beneath a Table coral (Acropora sp.) on a coral reef, Ras Mohammed National Park, Sinai, Egypt, Red Sea.

Alex Mustard / Red Sea steephead parrotfish (Chlorurus gibbus) male, portrait, Ras Mohammed National Park, Sinai, Egypt, Red Sea.

Alex Mustard / Large school of Scalefin anthias (Pseudanthias squamipinnis) swimming around soft corals (Dendronephthya sp.) and Table coral (Acropora sp.) on coral reef, Ras Mohammed National Park, Sinai, Egypt, Re...

Alex Mustard / Bluebarred parrotfish (Scarus ghobban) with tail fin missing, portrait, Ras Mohammed National Park, Sinai, Egypt, Red Sea.

Alex Mustard / School of Scalefin anthias (Pseudanthias squamipinnis) swimming around a red soft coral growing beneath an overhang, with diver in background, Ras Mohammed National Park, Sinai, Egypt, Red Sea.

Alex Mustard / Coral reef below the cliffs of Shark Observatory, Ras Mohammed National Park, Sinai, Egypt, Red Sea.

Alex Mustard / Fantail stingray (Pastinachus sephen) resting on seabed with diver behind, Ras Mohammed National Park, Sinai, Egypt, Red Sea.

Alex Mustard / School of orange Scalefin anthias (Pseudanthias squamipinnis) on a coral reef with table corals (Acropora sp.) and red soft corals (Dendronephthya sp.), Ras Mohammed National Park, Sinai, Egypt. Red S...

Alex Mustard / Male Emperor angelfish (Pomacanthus imperator) swimming over garden of Fire corals (Millepora sp.) in morning sunshine, Ras Mohammed National Park, Sinai, Egypt, Red Sea.

Alex Mustard / Yellowbar angelfish / Goldbar angelfish (Pomacanthus maculosus) on a coral reef with colourful soft corals (Dendronephthya sp.) and (Scleronephthya sp.), a Coral grouper (Cephalopholis miniata) and An...

Alex Mustard / Napoleon wrasse (Cheilinus undulatus) swimming over a coral reef, Ras Mohammed National Park, Sinai, Egypt, Red Sea.

Alex Mustard / Hawksbill turtle (Eretmochelys imbricata) feeding on red soft coral (Dendronepthya sp.) on a coral reef, Ras Mohammed National Park, Sinai, Egypt, Red Sea.

Noemie Stroh / Orbicular batfish (Platax orbicularis) schooling into the blue, Shark Reef, Ras Mohamed National park, Red Sea, Egypt, June.

Alex Mustard / Slingjaw wrasse (Epibulus insidiator) smaller female and larger male spawning above a coral reef. Ras Mohammed National Park, Sinai, Egypt. Red Sea

Alex Mustard / Female Red Sea bird mouth wrasse (Gomphosus caeruleus klunzingeri) swims in front of a school of scalefin anthias (Pseudanthias squamipinnis). Ras Mohammed National Park, Sinai, Egypt. Red Sea

Alex Mustard / Portrait of a Coral grouper (Cephalopholis miniata) on a reef. Ras Mohammed National Park, Sinai, Egypt. Red Sea

Alex Mustard / Scissortail sergeant (Abudefduf sexfasciatus) swims beneath the surface of the sea above a coral reef. Ras Mohammed National Park, Sinai, Egypt. Red Sea

Alex Mustard / Detail of scales and blue and yellow colour pattern of a Goldbar angelfish (Pomacanthus maculosus). Ras Mohammed National Park, Sinai, Egypt. Red Sea

Alex Mustard / Colourful coral reef wall, with orange scalefin anthias (Pseudanthias squamipinnis) swarming over red, orange and pink soft corals (Dendronephthya sp.) in a current, with a lone bullethead parrotfish...

Alex Mustard / Group of yellowspotted trevally (Carangoides fulvoguttatus) schooling together in open water during spawning season. Many jacks and trevallies show black pigment during courtship. Ras Mohammed Nationa...

Alex Mustard / Regal angelfish (Pygoplites diacanthus) spreads its fins and flutters its tail in the face of a predatory snubnose grouper (Epinephelus macrospilos) to chase it from its territory on a coral reef. Ras...

Alex Mustard / Portrait of a bluespotted stingray (Taeniura lymma) on the sand. Ras Mohammed National Park, Sinai, Egypt. Red Sea

Alex Mustard / Huge school of Giant trevally (Caranx ignobilis), each fish is close to 1m in length, swimming in open water close to a coral reef. Ras Mohammed National Park, Sinai, Egypt. Red Sea.

Alex Mustard / Shoal of a Red Sea soldierfish (Myripristis murdjan) shelter in a coral filled cave. Ras Mohammed National Park, Sinai, Egypt. Red Sea.