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...

Alex Mustard / Yellowtail tang (Zebrasoma xanthurum) male courting a female prior to spawning at dusk on a coral reef. Temple, Ras Umm Sid, Sharm El Sheikh, Sinai, Egypt. Red Sea.

Pete Oxford / Yellow-tailed Surgeonfish (Prionurus laticlavius) school and snorkeler, Galapagos Islands, Ecuador

Pete Oxford / Yellow-tailed Surgeonfish (Prionurus laticlavius) school and snorkelers, Galapagos Islands, Ecuador

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

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

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

Jeff Rotman / Orangespine unicornfish (Naso lituratus) profile portrait, Red Sea, Egypt.

Franco Banfi / Shoal of Sleek unicornfish (Naso hexacanthus) Maldives, Indian Ocean

Georgette Douwma / Dead surgeonfish being 'cleaned' by a Bleusreak cleaner wrasse (Labroides dimidiatus). Many fish observed dead or dying on reefs in the Maldives, April 2012. Another episode of dying fish was in 2007....

Georgette Douwma / Powder blue surgeonfish (Acanthurus leucosternon), large school swimming, Andaman Sea, Thailand

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