Alex Mustard / Pederson cleaner shrimp (Periclimenes pedersoni) cleaning the eye of a Nassau grouper (Epinephelus striatus), Bloody Bay Wall, Little Cayman, Cayman Islands. British West Indies, Caribbean Sea.

Georgette Douwma / White banded/ Scarlet cleaner shrimp (Lysmata amboinensis) on Coral hind (Cephalopholis miniata) Rinca, Komodo National Park, Indonesia, October

Doug Perrine / Yellow edged moray eel {Gymnothorax flavimarginatus} having mouth cleaned by Humpback cleaner shrimp {Lysmata amboinensis} Sabah Borneo (Non-ex).

Juergen Freund / Cleaner shrimps (Urocaridella sp) Bali, Indonesia.

Juergen Freund / Fimbriated moray eel (Gymnothorax fimbriatus) with a cleaner shrimp. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Fimbriated moray eel (Gymnothorax fimbriatus) with a cleaner shrimp. Lembeh Strait, North Sulawesi, Indonesia.

Georgette Douwma / White Banded Cleaner Shrimp (Lysmata amboinensis) attending to a Three-spot Damselfish (Dascyllus trimaculatus), with Hingebeak Shrimps (Rhynchocinetes durbanenesis) in foreground. Rinca, Komodo Natio...

Georgette Douwma / White Banded Cleaner Shrimp (Lysmata amboinensis) attending to a Three-spot Damselfish (Dascyllus trimaculatus). Rinca, Komodo National Park, Indonesia, October.

Michele Westmorland / Pederson / Cleaner shrimp (Periclimenes pedersoni) in Corkscrew anemone (Bartholomea annulata) Dominica, West Indies, Caribbean.

Tim Laman / Honeycomb moray eel (Gymnothorax favagineus) with mouth open, being cleaned by cleaner shrimp and a juvenile Emperor angelfish (Pomacanthus imperator), Bali, Indonesia

GEORGETTE DOUWMA / Yellow-edged moray eel (Gymnothorax flavimarginatus) being cleaned by a Hump-back cleaner shrimp (Lysmata amboinenis) with Hinge-beak prawn / Durban shrimps (Rhynchocinetes durbanensis) on coral rock...

GEORGETTE DOUWMA / Yellow-edged moray eel (Gymnothorax flavimarginatus) being cleaned by a Hump-back cleaner shrimp (Lysmata amboinenis) with Hinge-beak prawn / Durban shrimps (Rhynchocinetes durbanensis) on coral rock...

GEORGETTE DOUWMA / Yellow-edged moray eel (Gymnothorax flavimarginatus) being cleaned by a Hump-back cleaner shrimp (Lysmata amboinenis) with Hinge-beak prawn / Durban shrimps (Rhynchocinetes durbanensis) on coral rock...

GEORGETTE DOUWMA / Yellow-edged moray eel (Gymnothorax flavimarginatus) being cleaned by a Hump-back cleaner shrimp (Lysmata amboinenis) with Hinge-beak prawn / Durban shrimps (Rhynchocinetes durbanensis) on coral rock...

Claudio Contreras / Spotted cleaner shrimp (Periclimenes yucatanicus) amongst tentacles of Giant anemone (Condylactis gigantea) Puerto Morelos National Park, Caribbean Sea, Mexico, January

Jeff Rotman / Black-Finned Snake Eel (Ophichthus melanochir) with Cleaner Shrimp (Stenopodidae). Lembeh Strait, Celebes Sea, Sulawesi, Indonesia.

GEORGETTE DOUWMA / Cleaner shrimp (Lysmata amboinensis) on diver's mouth to clean teeth. Bali, Indonesia

Jane Burton / Electric blue damselfish {Pomacentrus caeruleus} and three Cleaner shrimps {Hippolysmata grabhami} captive,

Doug Perrine / Tomato grouper / cod {Cephalopholis sonnerati} being cleaned by Humback cleaner shrimp {Lysimata amboiensis} Bali, Indonesia

GEORGETTE DOUWMA / Yellowfin goatfish (Mulloidichthys vanicolensis) lying on sand next to Cerianthid anemone where cleaner shrimps have set up cleaning station. Vava'u, Tonga, Indo-Pacific

GEORGETTE DOUWMA / Honeycomb moray eel (Gymnothorax favagineus) with mouth open, surrounded by cleaner shrimps, Bali, Indonesia

GEORGETTE DOUWMA / Yellow edged / margined moray eel (Gymnothorax flavimarginatus) being cleaned by a Hump-back / Scarlet cleaner shrimp (Lysmata amboinenis) with Durban hinge-beak shrimps (Rhynchocinetes durbanensis) o...

Juergen Freund / Cleaner shrimp (Periclimenes pedersoni) on skin of Grouper fish (Cephalopholis fulvus)

Nature Production / White-Banded / Scarlet Skunk Cleaner Shrimp {Lysmata amboinensis} cleaning Bicolor anthias {Pseudanthias bicolor} Okinawa, Japan

Brent Hedges / Scarlet / Pacific Cleaner Shrimp (Lysmata amboinensis) cleaning mouth of Giant Moray eel (Gymnothorax javanicus) Papua New Guinea

Doug Perrine / Spotted cleaner shrimp {Periclimenes yucatanicus} in Giant sea anemone {Condylactis gigantea} Dominica, Caribbean

Doug Perrine / Yellow edged moray eel {Gymnothorax flavimarginatus} having mouth cleaned by Humpback cleaner shrimp {Lysmata amboinensis} Sabah Borneo (Non-ex).

Juergen Freund / Emperor cleaner shrimp {Periclimenes imperator / Zenopontonia rex} on sea cucumber. Indo Pacific

Doug Perrine / Spotted cleaner shrimp in symbiotic relationship with anemone {Periclimenes yucatanicus} Bonaire, Caribbean (Non-ex).

Doug Perrine / Scarlet cleaner shrimp {Lysmata amboinensis} in mouth of Tomato grouper {Cephalopholis sonnerati} Sabah Borneo (Non-ex).

Doug Perrine / Grey faced moray eel {Siderea thrysoidea} cleaned by Humpback cleaner shrimp {Lysmata amboidensis} Bali Indonesia (Non-ex).

Doug Perrine / Cleaner shrimp {Periclimenes sp} on Giant anemone {Condylactis gigantea} Bahamas, Caribbean (Non-ex).

Jeff Rotman / Scarlet cleaner shrimp {Lysmata amboinensis} Red Sea

Juergen Freund / Cleaner shrimp {Periclimenes pedersoni} Caribbean

Juergen Freund / Cleaner shrimp {Periclimenes sp} transparent on coral, Philippines, Indo pacific

Juergen Freund / Cleaner shrimp {Periclimenes pedersoni} transparent on coral, Caribbean

Juergen Freund / Cleaner shrimp {Periclimenes sp} completely transparent on coral, Philippines, Indo pacific

Juergen Freund / Cleaner shrimp {Periclimenes sp} on coral, Philippines, Indo pacific

Juergen Freund / Cleaner shrimp {Periclimenes pedersoni} Caribbean

Juergen Freund / Cleaner shrimp on coral {Periclimenes sp} Philippines

Juergen Freund / Banded coral shrimp {Stenopus hispidus} Cuba Caribbean Sea

Juergen Freund / Emperor cleaner shrimp {Periclimenes imperator / Zenopontonia rex} on sea cucumber Sulawesi, Indonesia

Juergen Freund / Banded coral shrimp {Stenopus hispidus} Cuba, Caribbean Sea

Juergen Freund / Cleaner shrimp {Periclimenes sp} + Goby in tube sponge Cuba

DOC WHITE / Moray eel with Cleaner shrimps {Muraenidae} California USA