Alex Mustard / Yellowtail tang (Zebrasoma xanthurum) male and female turn belly to belly during spawning to ensure fertilization. Temple, Ras Umm Sid, Sharm El Sheikh, Sinai, Egypt. Red Sea. This action is very fast...

Michael Pitts / Anemones (Actiniaria) with Maldives anemonefish (Amphiprion nigripes) and Surgeonfish (Acanthurus) moving in a strong current, Maldives, Indian Ocean.

Doug Perrine / Green sea turtle (Chelonia mydas) being cleaned of algae by Yellow tangs / surgeonfish (Zebrasoma flavescens), Puako, Kona, Hawaii, USA, June, Endangered species

Doug Perrine / Green sea turtle (Chelonia mydas) cleaned of algae by Yellow tangs / surgeonfish (Zebrasoma flavescens), Puako, Kona, Hawaii, USA, June, Endangered species

Pascal Kobeh / Ocan Pacifique - Nouvelle caldonie - Gros plan de la tte d'un nason licorne (Naso brevirostris) de nuit Pacific Ocean - New Caledonia - A close-up of the head of a spotted or longnose unicornfish (Na...

Alex Mustard / View down on a pillar coral (Dendrogyra cylindrus) growing on a coral reef, with blue tangs. Jardines de la Reina, Gardens of the Queen National Park, Cuba. Caribbean Sea.

Shane Gross / Nurse shark (Ginglymostoma cirratum) resting near a coral reef and other fish like blue tangs in The Bahamas.

David Fleetham / Goldring surgeonfish (Ctenochaetus strigosus) and yellow tangs (zebrasoma flavescens) cleaning algae from the shell of green turtle (Chelonia mydas), Hawaii.

Alex Mustard / Bignose unicornfish (Naso vlamingii) profile of male displaying (the blue stripe at the bottom of the frame is the tail of another individual) Baa Atoll, Maldives. Indian Ocean.

Pascal Kobeh / School of Razor surgeonfish (Prionurus laticlavius) Galapagos. Pacific ocean.

Pascal Kobeh / Bluestreak cleaner wrasse (Labroides dimidiatus) cleaning Spotted unicornfish (Naso brevirostris) Palau. Philippine Sea.