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

Alex Mustard / Bengal snapper (Lutjanus bengalensis), Bannerfish (Heniochus diphreutes) and Fusiliers (Caesio sp.) diving towards coral reef to avoid predators. North Ari Atoll, Maldives. Indian Ocean.

Jordi Chias / Schoolmaster snapper (Lutjanus apodus) school in the reef, Little Cayman island, Cayman Islands, Caribbean.

Tony Wu / Twinspot snapper (Lutjanus bohar) shoal rushing up to spawn, releasing a cloud of milky white sperm and eggs in the water column. Caroline Islands, Palau, November.

Tony Wu / Twinspot snapper (Lutjanus bohar) engaged in a mass spawning aggregation early in the morning. Caroline Islands, Palau. April. Winner of Underwater category, Wildlife Photographer of the Year 2016.

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 / Portrait of pair of Bohar snappers (Lutjanus bohar) in their spawning aggregation. Shark Reef, Ras Mohammed Marine Park, Sinai, Egypt. Red Sea.

Alex Mustard / Portrait of Bohar snappers (Lutjanus bohar) in its spawning aggregation. Shark Reef, Ras Mohammed Marine Park, Sinai, Egypt. Red Sea.

Alex Mustard / Schoolmaster snapper (Lutjanus apodus) school, under a coral ledge, Snapper Hole, East End, Grand Cayman, Cayman Islands, Caribbean Sea.

Alex Mustard / Schoolmaster snapper (Lutjanus apodus) above a coral reef, Georgetown, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Georgette Douwma / Soft Coral (Dendronephthya sp) with Blueline snappers (Lutjanus kasmira). Rinca, Komodo National Park, Indonesia.

Juergen Freund / A school of Bigeye Snapper {Lutjanus lutjanus} Indo-pacific

Juergen Freund / A school of Bigeye snapper {Lutjanus lutjanus} Indo-pacific

Georgette Douwma / Shoal of Bohar / Twinspot snapper {Lutjanus bohar} Ras Mohammed, Red Sea, Egypt

Alex Mustard / Large school of Humpback snapper (Lutjanus gibbus) form into a tight ball on a coral reef. North Ari Atoll, Maldives. Indian Ocean.

Alex Mustard / Reef manta (Mobula alfredi) visiting a cleaning station on a coral reef with a school of Onespot snappers (Lutjanus monostigma), Oriental sweetlips (Plectorhinchus vittatus) and Sabre squirrelfish (Sa...

Georgette Douwma / Kaleidoscopic image of Bigeye snappers (Lutjanus lutjanus) with soft corals. West Papua, Indonesia.

Pascal Kobeh / Giant pufferfish (Arothron stellatus) and Bigeye snapper (Lutjanus lutjanus) school amongst wreck of Mitsio. Nosy Be, Madagascar.

Pascal Kobeh / Bigeye snapper (Lutjanus lutjanus) school and Golden pilot jack (Gnathanodon speciosus) circling around bow of Mitsio shipwreck. Diver in background. Nosy Be, Madagascar.

Pascal Kobeh / Bigeye snapper (Lutjanus lutjanus) school above coral reef, diver in background. Indian Ocean, Madagascar.

Shane Gross / Schoolmaster snapper (Lutjanus apodus) shoal sheltering amongst Red mangrove (Rhizophora mangle) roots. Caribbean Sea off Gardens of the Queen National Park, Cuba.

Shane Gross / Caribbean reef shark (Carcharhinus perezi) patrolling coral reef with Schoolmaster snapper (Lutjanus apodus) and other fish. Caribbean Sea off Gardens of the Queen National Park, Cuba.

Gary Bell/ Oceanwide / Bluestripe Snapper (Lutjanus kasmira) school, Great Barrier Reef, Australia

Franco Banfi / Scuba diver swim between shoal of Dog snapper, (Lutjanus novemfasciatus) and shoal of Big-eye jacks (Caranx sexfasciatus), Cabo Pulmo Marine National Park, Baja California Sur, Mexico

Franco Banfi / Shoal of Dog snapper, (Lutjanus novemfasciatus) in front of shoal of Big-eye jacks (Caranx sexfasciatus), Cabo Pulmo Marine National Park, Baja California Sur, Mexico

Franco Banfi / Shoal of Yellow snapper (Lutjanus argentiventris), Cabo Pulmo Marine National Park, Baja California Sur, Mexico

Alex Mustard / Coral grouper (Cephalopholis miniata) waits in ambush, hiding against a seafan (Annella sp.) hunting silversides (Atherinidae), with schooling bigeye snapper (Lutjanus lutjanus) behind. Misool, Raja A...

Alex Mustard / Several mimic goatfish (Mulliodichthys mimicus) hide within a school of Bluestripe snapper (Lutjanus kasmira) on a coral reef. North Ari Atoll, Maldives. Indian Ocean

Shane Gross / Schoolmaster snapper (Lutjanus apodus) in red mangrove(Rhizophora mangle) and turtlegrass (thalassia testudinum) habitats, Eleuthera Island, Bahamas.

Nick Hawkins / Blue-lined snapper (Lutjanus kasmira) shoal. Cocos Island National Park, Costa Rica.

Nick Hawkins / Blue-lined snapper (Lutjanus kasmira) shoal. Near Cocos Island National Park, Costa Rica.

David Fleetham / Blacktail snapper (Lutjanus fulvus) in coral reef. Kauai, Hawaii.

David Fleetham / Diver photographing Anemonefish (Amphiprion percula) and Anemone (Actiniaria). Wakatobi, Sulawesi, Indonesia. Model released.

David Fleetham / Bluestripe snapper (Lutjanus kasmira) school under rock arch, introduced species. Kona Coast, The Big Island, Hawaii.

Georgette Douwma / Bigeye snapper (Lutjanus lutjanus) school over coral reef. Triton Bay, West Papua, Indonesia.

Linda Pitkin / Bigeye snappers (Lutjanus lutjanus) schooling in coral reef gully, Triton Bay, near Kaimana, West Papua, Indonesia

Linda Pitkin / Two-spot banded snapper (Lutjanus biguttatus), Triton Bay, near Kaimana, West Papua, Indonesia

David Fleetham / Eleven year old PADI certified junior scuba diver, Sean Fleetham and schooling Bluestripe snapper (Lutjanus kasmira) off Second Cathedral, and dive site off the island of Lanai, Hawaii. December 2013....

David Fleetham / Diver and schooling Blue striped snapper (Lutjanus kasmira) on the wreck of the Sea Tiger off Waikiki, Oahu, Hawaii. December 2013. Model released.

David Fleetham / Clown anemonefish (Amphiprion percula) in Magnificent anemone (Heteractis magnifica) Indonesia.

David Fleetham / Adult Two-spot Red Snapper (Lutjanus bohar) among other reef fish. Bequ Lagoon, Fiji.

David Fleetham / A pair of Green Sea Turtles (Chelonia mydas) swimming through a school of Raccoon Butterflyfish (Chaetodon lunula) and Bluestripe Snapper (Lutjanus kasmira). Hawaii. Three images were digitally combin...

David Fleetham / Schooling Bluelined snapper (Lutjanus kasmira),Hawaii.

David Fleetham / Cubera snapper (Lutjanus cyanopterus) with Goby (Gobius sp) in its mouth that is looking for parasites. Bonaire, Netherlands Antilles, Caribbean.

David Fleetham / Cubera snapper (Lutjanus cyanopterus), Bonaire, Netherlands Antilles, Caribbean.

David Fleetham / Blacktail snapper (Lutjanus fulvus), Hawaii.

David Fleetham / Shoal of Bluelined / Bluestriped snapper (Lutjanus kasmira) passing a diver working on a large wave-energy buoy off Kaneoho Bay, Oahu. The 40-kW experimental buoy employs the bobbing motion of the buo...

David Fleetham / Diver and schooling bluelined / blue striped snapper (Lutjanus kasmira) on the wreck of the "Sea Tiger" off Waikiki, Oahu, Hawaii. Model released

David Fleetham / Schoolmaster snapper (Lutjanus apodus) on coral reef. Bonaire, Netherlands Antilles, Caribbean.

David Fleetham / Bluelined snapper (Lutjanus kasmira) shoal, Hawaii.

Alex Mustard / Blueline snapper (Lutjanus kasmira) school. Vavuu Atoll, Maldives. Indian Ocean.

Alex Mustard / Blueline snapper (Lutjanus kasmira) school above Black coral (Antipatharia) in reef. Vavuu Atoll, Maldives. Indian Ocean.

Alex Mustard / Blueline snapper (Lutjanus kasmira) school. Vavuu Atoll, Maldives. Indian Ocean.

Alex Mustard / Schoolmaster snapper (Lutjanus apodus) on coral reef. East End, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Richard Robinson / Bridled bream (Scolopsis bilineatus) Ono-i-Lau / Ono-i-Tonga, Lau Island Group, Fiji.

Linda Pitkin / Mahogany snapper (Lutjanus mahogoni), above coral reef, Bonaire, Leeward Antilles, Caribbean.

Linda Pitkin / Schoolmaster snapper (Lutjanus apodus) on coral reef Bonaire, Leeward Antilles, Caribbean.

Linda Pitkin / Schoolmaster snapper (Lutjanus apodus) on coral reef Bonaire, Leeward Antilles, Caribbean.

Linda Pitkin / Mahogany snapper (Lutjanus mahogoni) aggregation Bonaire, Leeward Antilles, Caribbean.

Claudio Contreras / Elkhorn coral (Acropora palmata) French Grunt (Haemulon flavolineatum) and Schoolmaster Snapper (Lutjanus apodus), Jardines de la Reina / Gardens of the Queen National Park, Caribbean Sea, Ciego de Av...

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

Jordi Chias / School blueline snappers (Lutjanus kasmira) South Ari Atoll, Maldives, Indian Ocean.

Jordi Chias / Potato cod (Epinephelus tukula) with school Blueline snappers (Lutjanus kasmira) Tofo Coast, Mozambique, Indian Ocean. South-East Coast.

Georgette Douwma / Two-spot banded snapper (Lutjanus biguttus). Malaysia.

Georgette Douwma / Two-spot banded snapper (Lutjanus biguttus). Malaysia.

Bert Willaert / Clown anemonefish (Amphiprion percula) in anemone, Kimbe Bay, West New Britain, Papua New Guinea

Bert Willaert / Clown anemonefish (Amphiprion percula) in anemone, Kimbe Bay, West New Britain, Papua New Guinea

Bert Willaert / Clown anemonefish (Amphiprion percula), Bismarck Sea, Vitu Islands, West New Britain, Papua New Guinea

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 / Blackspot snapper (Lutjanus ehrenbergii). Beacon Rock, Sinai, Egypt. Red Sea.

Alex Mustard / Schoolmaster snapper (Lutjanus apodus) hunts silversides (Atherinidae) inside a coral cavern. George Town, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Alex Mustard / School of Bohar snapper (Lutjanus bohar) in open water above a coral reef. These fish are usually solitary and aggregate each summer in the Red Sea to spawn. Shark Reef, Ras Mohammed, Sinai, Egypt. Re...

Alex Mustard / School of Bohar snapper (Lutjanus bohar) in open water close to a coral reef. These fish are usually solitary and aggregate each summer in the Red Sea to spawn. Shark Reef, Ras Mohammed, Sinai, Egypt....

Alex Mustard / School of Bohar snapper (Lutjanus bohar) in open water close to a coral reef. Shark Reef, Ras Mohammed, Sinai, Egypt. Red Sea.

Alex Mustard / School of Bohar snapper (Lutjanus bohar) close to a coral reef. These fish are usually solitary and aggregate each summer in the Red Sea to spawn. Shark Reef, Ras Mohammed, Sinai, Egypt. Red Sea.

Franco Banfi / Snapper (Lutjanus jocu) Fernando de Noronha Marine National Park, Brazilian Atlantic Islands UNESCO World Heritage Site, Pernambuco, Brazil, South Atlantic Ocean

Franco Banfi / Shoal of blue-and-gold snapper, (Lutjanus viridis), Sea of Cortez, Baja California, Mexico, East Pacific Ocean

Angelo Gandolfi / Pointed-snout wrasse (Symphodus rostratus) in Neptune grass (Posidonia oceanica) prairie, Western Mediterranean Sea, Ibiza UNESCO World Heritage Site, Spain.

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

Georgette Douwma / Bigeye snapper (Lutjanus lutjanus) shoal in coral reef scenery including Soft corals (Dendronephthya sp), West Papua, Indonesia.

Georgette Douwma / Bigeye snappers (Lutjanus lutjanus) shoal swimming in coral reef including Black coral (Antipathes dichotoma), West Papua, Indonesia.

Georgette Douwma / Bigeye snapper (Lutjanus lutjanus) shoal in coral reef, West Papua, Indonesia.

Alex Mustard / Caribbean reef sharks (Carcharhinus perezi) swimming through the middle of a school of yellowtail snappers (Ocyurus chrysurus). Grand Bahama, Bahamas. Tropical West Atlantic Ocean.

Alex Mustard / Bohar snappers (Lutjanus bohar) breaking up into smaller groups to spawn close to full moon. The fish swim short arches above the main group as they release clouds of gametes (eggs from the female, sp...

Alex Mustard / Large school of Bohar snappers (Lutjanus bohar) swimming in a tight, fast moving circular school over the reef, just before swimming into open water to spawn. Shark City, Ulong, Rock Islands, Palau. T...

Alex Mustard / Bohar snappers (Lutjanus bohar) breaking up into smaller groups to spawn close to full moon. The fish swim short arches above the main group as they release clouds of gametes (eggs from the female, sp...

Alex Mustard / Bohar snappers (Lutjanus bohar) breaking up into smaller groups to spawn close to full moon. The fish swim short arches above the main group as they release clouds of gametes (eggs from the female, sp...

Claudio Contreras / Blue and Gold Snapper (Lutjanus viridis), San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage Site (Socorro Islands), Pacifi...

Linda Pitkin / Bluestripe snappers (Lutjanus kasmira) and Bigeye Snappers (Lutjanus lutjanus) in mixed-species school. Mioskon, Dampier Strait, Raja Ampat, West Papua, Indonesia.

Linda Pitkin / Bigeye snappers (Lutjanus lutjanus) in mixed-species school with Bluestripe snappers (Lutjanus kasmira) Mioskon, Dampier Strait, Raja Ampat, West Papua, Indonesia.

Alex Mustard / Bohar snapper (Lutjanus bohar) school at Ras Mohammed, Shark Reef, Ras Mohammed, Sinai, Egypt. Red Sea.

Tony Wu / Humpback red snapper (Lutjanus gibbus) juvenile, Kokopo, Papua New Guinea.