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

Georgette Douwma / Emperor angelfish (Pomacanthus imperator) swimming past soft corals (Dendronephthya sp]), Red Sea, Egypt. January.

Constantinos Petrinos / Emperor red snaper (Lutjanus sebae) sub-adult. Lembeh Strait, North Sulawesi, Indonesia.

Alex Mustard / Emperor angelfish (Pomacanthus imperator) close up pattern detail, Ras Umm Sid, Sinai, Egypt. Red Sea.

Georgette Douwma / Emperor angelfish (Pomacanthus imperator) swimming past Soft corals (Dendronephthya sp) and Lyretail anthias (Pseudanthius squamipinnis). Egypt, Red Sea. Indo-Pacific.

Pascal Kobeh / Bluestreak cleaner wrasses (Labroides dimidiatus) cleaning Bigeye emperor (Monotaxis grandoculis) Sudan. Red Sea.

Alex Mustard / School of Bluescale emperors (Lethrinus nebulosus) gathered for spawning. This species is usually solitary predator on the coral reef. Yolanda Reef, Ras Mohammed Marine Park, Sinai, Egypt. Red Sea.

Georgette Douwma / Spangled emperor (Lethrinus nebulosus) watching a Blue spotted ribbontail ray (Taeniura lymna) that is burrowing in the sandy bottom for prey. Egypt, Red Sea.

Georgette Douwma / A school of Spangled emperors (Lethrinus nebulosus) accompanied by one Jack (Caranx sexfasciatus) over coral reef. Egypt, Red Sea.

Georgette Douwma / Lyretail anthias / Goldies (Pseudanthias squamipinnis) on reef top. Egypt, Red Sea.

Georgette Douwma / Emperor angelfish (Pomacanthus imperator) swimming past soft corals (Dendronephthya sp) Egypt, Red Sea.

Georgette Douwma / Emperor angelfish (Pomacanthus imperator) feeding on soft coral. Egypt, Red Sea.

Georgette Douwma / Emperor angelfish (Pomacanthus imperator) feeding on soft coral. Egypt, Red Sea.

Georgette Douwma / Emperor angelfish (Pomacanthus imperator) at a cleaning station amongst soft corals, where small cleaner shrimps operate. Egypt, Red Sea.

Georgette Douwma / Emperor angelfish (Pomacanthus imperator) swimming past coral reef. Egypt, Red Sea.

Georgette Douwma / Emperor angelfish (Pomacanthus imperator) swimming past coral reef. Egypt, Red Sea.

Georgette Douwma / Coral reef scenery with an Emperor angelfish (Pomacanthus imperator) and soft corals. Egypt, Red Sea.

Georgette Douwma / Coral reef scenery with an Emperor angelfish (Pomacanthus imperator) and soft corals. Egypt, Red Sea.

Norbert Wu / Emperor Angelfish (Pomacanthus imperator) close-up detail of patterns, Red Sea, Egypt

Gary Bell/ Oceanwide / Yellow-banded Snapper (Lutjanus adetii) and Emperor Red Snapper (Lutjanus sebae), Heron Island, Great Barrier Reef, Queensland, Australia

Joel Sartore / Photo Ark / Emperor angelfish (Pomacanthus imperator) portrait, Sharjah Aquarium, UAE. Captive, occurs in Indian Ocean, Pacific Ocean and Red Sea.

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 / Emperor angelfish (Pomacanthus imperator) swimming in front of Fire corals (Millepora dichotoma) and soft corals (Dendronephthya sp.) and (Scleronephthya sp) with Scalefin anthias (Pseudanthias squami...