Gary Bell/ Oceanwide / Whitemouth Moray (Gymnothorax meleagris) being cleaned by Cleaner Wrasse (Labroides sp) juvenile, Christmas Island, Australia

Gary Bell/ Oceanwide / Meyer's Butterflyfish (Chaetodon meyeri) being cleaned by Blue-streaked Cleaner Wrasse (Labroides dimidiatus), Great Barrier Reef, Queensland, Australia

Alex Mustard / Reef manta (Mobula alfredi) female swimming close to a coral reef, while cleaner wrasse (Labroides dimidiatus), tiny by comparison, pick parasites from her lips. Misool, Raja Ampat, West Papua, Indone...

Shane Gross / Pelagic thresher shark (Alopias pelagicus) cleaned by Bluestreak cleaner wrasse (Labroides dimidiatus) at Monad Shoal off Malapascua Island, Philippines.

Gary Bell/ Oceanwide / Blue-streaked Cleaner Wrasse (Labroides dimidiatus) cleaning gills of Semicircle Angelfish (Pomacanthus semicirculatus), Great Barrier Reef, Australia

Alex Mustard / Bluestreak cleaner wrasse (Labroides dimidiatus) attends to a Clark's anemonefish (Amphiprion clarkii) at a cleaning station on a coral reef. It is unusual to see an anemonefish at a cleaning stat...

David Fleetham / Map pufferfish (Arothron mappa) getting gills cleaned by Cleaner wrasse (Labroides dimidiatus), Philippines.

David Fleetham / Lined sweetlips (Plectorhinchus lineatus) with two cleaner wrasse (Labroides dimidiatus), Indonesia.

David Fleetham / Two adult bluestreak cleaner wrasse (Labroides dimidiatus) searching a clown sweetlips (Plectorhinchus chaetodonoides) for parasites, Indonesia.

Alex Mustard / Reef manta (Mobula alfredi) at a cleaning station with Cleaner wrasse (Labroides dimidiatus). South Ari Atoll, Maldives. Indian Ocean.

Richard Robinson / Orbicular damselfish (Amblyglyphidodon orbicularis) cleaned by the Striped Cleaner Wrasse (Labroides dimidiatus) at Yagasa Lagoon, Lau Island Group, Fiji.