Magnus Lundgren / Juvenile Ocellaris / Common clownfish (Amphiprion ocellaris) looking out from its home in an anemone, Raja Ampat, West Papua, Indonesia, Pacific Ocean.

Alex Mustard / RF - Portrait of Spinecheek anemonefish (Premnas biaculeatus) in its host Bubble-tip anemone (Entacmaea quadricolor) on a coral reef. Raja Ampat, West Papua, Indonesia. Ceram Sea. (This image may be l...

Alex Mustard / Portrait of a Red Sea anemonefish (Amphiprion bicinctus) above the tentacles of a Magnificent sea anemone (Heteractis magnifica) on a coral reef. Daedelus Reef. Egypt. Red Sea.

Alex Mustard / Saddleback anemonefish (Amphiprion polymnus) barks a warning as it guards a clutch of developing eggs (beneath it) laid on a small stone, below a fold in its home, a Haddon's sea anemone (Stichoda...

Shane Gross / Pink anemonefish (Amphiprion perideraion) living in symbiotic association with Magnificent sea anemone (Heteractis magnifica) Palau.

Shane Gross / Pink anemonefish (Amphiprion perideraion) living in symbiotic association with Magnificent sea anemone (Heteractis magnifica), Palau

Shane Gross / Clark's Anemonefish (Amphiprion clarkii) tending to her eggs. Kimbe Bay, Papua New Guinea

Alex Mustard / Western clown anemonefish (Amphiprion ocellaris) poses with a large, dominant female behind. The clownfish in the foreground is probably a juvenile. Bitung, North Sulawesi, Indonesia. Lembeh Strait, M...

Alex Mustard / Three Pink anemonefish (Amphiprion perideraion) living in a purple skirted magnificent sea anemone (Heteractis magnifica) on a coral reef, below a small island. Misool, Raja Ampat, West Papua, Indones...

Alex Mustard / Pair of Western clown anemonefish (Amphiprion ocellaris) spawning orange eggs on the rock beneath their Magnificent sea anemone (Heteractis magnifica) home on a coral reef. This photo shows the larger...

Pascal Kobeh / False clown anemonefish (Amphiprion ocellaris) in a magnificent sea anemone (Heteractis magnifica), Sulu sea, Philippines

Denis-Huot / Clownfish (Amphiprion sp) in anemone home, Philippines.

Nick Hawkins / Sergeant major (Abudefduf sp) schooling in mangroves of Isabela Island, Galapagos.

David Fleetham / Clark's anemonefish (Amphiprion clarkii), pair tending to egg mass placed beside the protection of an anemone. Yap, Micronesia.

Alex Mustard / Schools of Pacific creolefish (Cephalopholis colonus) and Panamic sergeant major (Abudefduf troschelii) swimming through sun beams inside an underwater cavern. Los Islotes, La Paz, Baja California Sur...

Franco Banfi / Three False clownfish (Amphiprion ocellaris) in Sea anemone (Heteractis magnifica) Lighthouse Reef, Cabilao Island, Bohol, Central Visayas, Philippines, Pacific Ocean.

Jordi Chias / Red Sea anemonefish (Amphiprion bicinctus) in their home, a Sea anemone (Heteractis magnifica), on a coral reef. Big Brother island, Red Sea. Egypt.

Brandon Cole / Pink anemonefish (Amphiprion perideraion) lives in symbiotic association with Magnificent sea anemone (Heteractis magnifica) Great Barrier Reef, Australia, Pacific Ocean

Alex Mustard / Maldive anemonefish (Amphiprion nigripes) shoal swimming in the current flowing over a Magnificent sea anemone (Heteractis magnifica). Baa Atoll, Maldives. Indian Ocean.

Alex Mustard / Maldivian anemonefish (Amphiprion nigripes) shelters against a closed magnificent sea anemone (Heteractis magnifica). Male Atoll, Maldives. Indian Ocean.

Alex Mustard / Red and black anemonefish (Amphiprion melanopus) in a Bulb tentacle sea anemone (Entacmaea quadricolor). Kri Island, Raja Ampat, West Papua, Indonesia, South East Asia. Dampier Strait, Tropical West P...

Alex Mustard / Scissortail sergeants (Abudefduf sexfasciatus) swimming over hard corals (Acropora sp.) on shallow reef at sunset, split level view. Gubal Island, Egypt. Red Sea.

Alex Mustard / Saddleback anemonefish (Amphiprion polymnus) in anemone home, Anilao, Batangas, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Ocean.

Doug Perrine / Barjacks (Caranx ruber), Yellowtail snapper (Ocyurus chrysurus), and Sergeant major damselfish (Abudefduf saxatilis) swimming around wreck of bow gun on C-58 shipwreck off Puerto Morelos, near Cancun,...

Alex Mustard / Pink anemonefish (Amphiprion perideraion) looks out from its host Magnificent sea anemone (Heteractis magnifica) Anilao, Batangas, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Ocea...

Alex Mustard / Portrait of Red Sea anemonefish (Amphiprion bicinctus) against open water. Abu Nuhas, Strait of Subal, Egypt. Gulf of Suez, Red Sea.

Alex Mustard / RF- Pair of Red Sea anemonefish (Amphiprion bicinctus) in Magnificent sea anemone (Heteractis magnifica), which has closed up in the late afternoon revealing its red skirt. St Johns Reef. Egypt. Red S...

Alex Mustard / Red Sea anemonefish (Amphiprion bicinctus) in Magnificent sea anemone (Heteractis magnifica), which has closed up in the late afternoon, on coral reef under stormy seas. St Johns Reef. Egypt. Red Sea.

Alex Mustard / Red Sea anemonefish (Amphiprion bicinctus) in front of magnificent sea anemone. Anemone City, Ras Mohammed Marine Park, Sinai, Egypt. Gulf of Aqaba, Red Sea.

Claudio Contreras,Claudio Contreras / Black-axil Chromis (Chromis atripectoralis) blurred motion photograph. Bilang Bilangang Island, Danajon Bank, Central Visayas, Philippines, April

Alex Mustard / RF - Ternate chromis (Chromis ternatensis) school swimming over Staghorn coral (Acropora sp.) on a reef, Laamu Atoll, Maldives, Indian Ocean. (This image may be licensed either as rights managed or ro...

Alex Mustard / Scuba diver watching a pair of Sergeant major damselfish (Abudefduf saxatilis) guarding their purple eggs, which have been laid on a shipwreck, Seven Mile Beach, Grand Cayman, Cayman Islands, Caribbe...

Alex Mustard / Male Sergeant major damselfish (Abudefduf saxatilis) guarding brood of purple eggs laid a shipwreck, Seven Mile Beach, Grand Cayman, Cayman Islands, Caribbean Sea.

Alex Mustard / Black and gold chromis (Neoglyphidodon nigroris) juvenile, portrait, Ambon Bay, Maluku Archipelago, Indonesia, Banda Sea.

Alex Mustard / Red Sea anemonefish / Two band anemonefish (Amphiprion bicinctus) in an anemone, Gubal Island, Egypt, Red Sea.

Alex Mustard / School of Maldives anemonefish (Amphiprion nigripes) congregating around a Magnificent sea anemone (Heteractis magnifica) on a coral reef, Laamu Atoll, Maldives, Indian Ocean.

Alex Mustard / Pair of Maldives anemonefish (Amphiprion nigripes) nestled in a Magnificent sea anemone (Heteractis magnifica), Laamu Atoll, Maldives. Indian Ocean.

Alex Mustard / Pair of Blue-green chromis (Chromis viridis) spawning on a rock on a coral reef, male is the larger fish, Laamu Atoll, Maldives, Indian Ocean.

Alex Mustard / Abundant growth of hard coral including (Porites sp.) and (Acropora sp.) with schools of Blue-green chromis (Chromis viridis) in the background, Laamu Atoll, Maldives, Indian Ocean.

Alex Mustard / Female Maldives anemonefish (Amphiprion nigripes) laying her eggs beneath an anemone, while the male hovers above waiting to fertilise them, Laamu Atoll, Maldives, Indian Ocean.