Close-up of the head of a Moray Eel being cleaned by cleaner shrimp, Urogcardidella anton bruunii, and cleaner wrasse, Similan Island, Thailand

A bluestreak cleaner wrasse searching the mouth of a clown sweetlips for parasites, Yap, Micronesia, Pacific

Potato cod (Epinephelus tukula) being cleaned by cleaner wrasse (Labroides dimidiatus), Cod Hole, Great Barrier Reef, Queensland, Australia, Pacific

Adult whitetip reef shark (Triaenodon obesus) with cleaner wrasse, Roroia, Tuamotus, French Polynesia, South Pacific, Pacific

Blackspotted Stingray at Cleaning Station, Taeniura meyeni, Indian Ocean, Maldives

A great barracuda (Sphyraena barracuda) comes close to the reef to be cleaned by a cleaner wrasse, Hawaii, United States of America, Pacific, North America

Giant Moray, Gymnothorax javanicus, Great Barrier Reef, Australia

Batfish cleaned by Cleaner Wrasse, Platax teira, Labroides dimidiatus, Indian Ocean, Maldives

Batfish cleaned by Cleaner Wrasse, Platax teira, Labroides dimidiatus, Indian Ocean, Maldives

Elongate Surgeonfish cleaned by Cleaner Wrasse, Acanthurus mata, Great Barrier Reef, Australia

Oriental Sweetlips cleaned by Cleaner Wrasse, Plectorhinchus vittatus, Labroides dimidiatus, South Male Atoll, Maldives

Flowery Grouper beeing cleaned, Epinephelus fuscoguttatus, Red Sea, Ras Mohammed, Egypt

Kleins Butterflyfish and Bicolor Cleaner Wrasse, Chaetodon kleinii, Labroides bicolor, Great Barrier Reef, Australia

Six-banded Angelfish cleaned by Cleaner Wrasse, Pomacanthus sexstriatus, Komodo National Park, Indonesia

Giant Moray, Gymnothorax javanicus, Red Sea, Dahab, Egypt

Harlequin Sweetlips cleaned by Cleaner Wrasse, Plectorhinchus chaetodonoides, Komodo National Park, Indonesia

Flowery Grouper beeing cleaned, Epinephelus fuscoguttatus, Red Sea, Ras Mohammed, Egypt

Blackspotted Puffer and Cleaner Wrasse, Arothron nigropunctatus, South Male Atoll, Maldives

Harlequin sweetlips and Cleaner Wrasse, Plectorhinchus chaetodonoides, Raja Ampat, West Papua, Indonesia

Six-banded Angelfish cleaned by Cleaner Wrasse, Pomacanthus sexstriatus, Komodo National Park, Indonesia

Yellow-ribbon Sweetlips with Cleaner Wrasse, Plectorhinchus polytaenia, Raja Ampat, West Papua, Indonesia

A reef manta ray (Mobula alfredi), hovers over a reef where small cleaner wrasse will relieve her of her parasites, Maldives.

A titan triggerfish hovers in a cleaning station, Red Sea.

Red grouper with open mouth and cleaner wrasse, Bali, Indonesia.

Oriental sweetlip and yellow snapper at cleaning statiuon with a cleaner wrasse, Ari and Male Atoll, Maldives.

Giant moray eel and cleaner wrasse, Ari and Male Atoll, Maldives

This fish is having its gills cleaned by a cleaner wrasse so it opens wide allowing the fish to come in and feed on parasites, Raja Ampat, Indonesia.

A longspine grouper (Epinephelus longispinis) being cleaned by a cleaner wrasse (Labroides dimidiatus).

An adult bluestreak cleaner wrasse (Labroides dimidiatus) at a cleaning station on the reef off Kri Island, Raja Ampat, Indonesia, Southeast Asia

Gray reef shark (Carcharhinus amblyrhynchos) approaches reef to get cleaned by wrasse,Truk lagoon, Chuuk, Federated States of Micronesia, Caroline Islands, Micronesia, Pacific Ocean, Pacific

Dotted sweetlips (Plectorhinchus picus), being cleaned by bluestreak cleaner wrasse (Labroides dimidiatus), Namu atoll, Marshall Islands, Pacific

Doublebar goatfish (Parupeneus bifasciatus) white phase, and cleaner wrasse (Labroides dimidiatus), Kailua-Kona, Hawaii, United States of America, Pacific

Star puffer (Arothron stellatus) and cleaner wrasse (Labroides dimidiatus), open mouth, Indo-Pacific Ocean

Sweetlips (Gaterin orentalis) opens mouth for Bluestreak cleaner wrasse (Labroides dimidiatus), Indian Ocean, Maldives, Asia

Close-up of giant moray (Gymnothorax javanicus) with cleaner fish, Abu Fendera reef dive site, Egypt, Red Sea, Africa

Symbiotic behaviour Symbiosis of jewel perch vermillion seabass (Cephalopholis miniata) lies at cleaning stationwith mouth wide open showing teeth rows of teeth motionless in coral reef lets cleaner wrasse bluestreak cleaner wrasse (Labroides dimidiatus) rid itself of parasites, Indian Ocean, Mascarene Islands, Mauritius, Africa

Symbiotic behaviour Symbiosis of giant moray (Gymnothorax javanicus) with open mouth looks directly at observer lets cleaner wrasse bluestreak cleaner wrasse (Labroides dimidiatus) rid itself of parasites, Indian Ocean, Mascarene Islands, Mauritius, Africa

Hawaii, white-mouth moray eel with cleaner wrasse in mouth.

Hawaii, Yellowfin goatfish (Mulloidichthys vanicolensis) and an endemic Hawaiian cleaner wrasse (Labroides phthirophagus) taking a close look in it's mouth.

Indonesia, clown triggerfish (balistoides conspicillum) and cleaner wrasse.

Bumphead parrotfish (Bolbometopon muricatum) are the largest species in this family and can reach 5 feet in length and over 160 pounds, Yap, Micronesia

While a Hawaii Cleaner Wrasse (Labroides phthirophagus) searches for parasites in its mouth, a Reef Manta Ray (Mobula (formerly Manta) alfredi) hovers over a reef cleaning station off the Kona Coast, the Big Island, Hawaii, USA during the summer. This par

Endemic Hawaiian Saddle Wrasse (Thalassoma duperrey) approach to clean a Reef Manta Ray (Mobula (formerly Manta) alfredi) of parasites at a reef cleaning station off the Kona Coast, the Big Island, Hawaii, USA. This particular female manta with a missing

The endemic Hawaiian Cleaner Wrasse (Labroides phthirophagus) is taking a close look for parasites on this Crocodile Needlefish (Tylosurus crocodilus), Hawaii, United States of America

Hawaii, Pyramid Butterflyfish (hemitaurichthys polylepis) above coral.

Blackspotted sweetlip (Plectorhinchus gaterinus) with cleaner wrasse (Labroides dimidiatus), Sudan, Red Sea, Africa