Alex Mustard / Large whip goby (Bryaninops amplus) with a parasitic copepod (with two trailing egg ribbons) perched on Red whip coral. Whale Rock. Fiabacet Islands, Misool, Raja Ampat, West Papua, Indonesia. Ceram S...

Nick Upton / Common prawns (Palaemon serratus) and a Rock goby (Gobius paganellus) feeding on a dead Montagu's crab (Xantho hydrophilus) in a rockpool, Cornwall, England, UK, September.

Nick Upton / Rock goby (Gobius paganellus) stealing food from a scavenging Common prawn (Palaemon serratus) in a rockpool, Cornwall, England, UK, September.

Alex Mustard / Glasseye snapper (Heteropriacanthus cruentatus) head portrait with a cleaning Goby (Gobiosoma genie) East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

David Fleetham / Fire Dartfish / Fire Goby (Nemateleotris magnifica) against colourful coral. Fiji's outer reef.

Todd Mintz / Sharknose cleaner goby (Gobiosoma evelynae) pair sheltering in hard coral, Netherlands Island, Dutch Antillies, Caribbean

Brandon Cole / Four-foot long Goliath Grouper (Epinephelus itajara) being cleaned by cleaner gobies. Florida Keys National Marine Sanctuary, USA, Atlantic Ocean, July.

Jurgen Freund / Two Twinspot / Crabeye gobies (Signigobius biocellatus) West New Britain, Papua New Guinea.

Jurgen Freund / Two whip coral gobies (Bryaninops yongei) on a black coral sea whip. Lembeh Strait, North Sulawesi, Indonesia.

David Fleetham / Goby (Eviota sp) and juvenile porcelain crab (Pteroeides sp), on a Seapen. Komodo National Park, Indonesia.

Georgette Douwma / Loki whip goby (Bryaninopss loki) on Sea pen (Virgularia gustaviana). Komodo National Park, Indonesia

Wild Wonders of Europe / Banfi / Red mouthed goby (Gobius cruentatus) on seabed, Larvotto Marine Reserve, Monaco, Mediterranean Sea, July 2009

Jurgen Freund / Crab eyed goby (Signigobius biocellatus) Indo-pacific

Georgette Douwma / Maiden gobies (Valenciennea puellaris) "kissing", Red Sea, Egypt

Magnus Lundgren / Wild Wonders of China / Whip coral gobies, or wire-coral gobies (Bryaninops yongei) on a stinging whip coral. Xiaoliuqiu Island, Taiwan

Jurgen Freund / Shortfin Lionfish (Dendrochirus brachypterus) and two Golden coral goby (Paragobiodon xanthosoma) using rubbish as their home, Sulawesi, Indonesia. November.

Jurgen Freund / Black banded damselfish (Amblypomacentrus breviceps) and Yellow clown goby (Gobiodon okinawae) hiding in a discarded bottle, Sulawesi, Indonesia. November.

Magnus Lundgren / Wild Wonders of China / Masked shrimpgoby (Amblyeleotris gymnocephala) and shrimp in Lembeh Strai, Sharp Island or Kiu Tsui Chau, Kiu Tsui Country Park, Hong Kong, China.

Magnus Lundgren / Wild Wonders of China / Masked shrimpgoby (Amblyeleotris gymnocephala) and shrimp in Lembeh Strai, Sharp Island or Kiu Tsui Chau, Kiu Tsui Country Park, Hong Kong, China.

Magnus Lundgren / Wild Wonders of China / Yellow prawn-goby (Cryptocentrus cinctus) Sharp Island or Kiu Tsui Chau, Kiu Tsui Country Park located at Port Shelter of Sai Kung, Hong Kong, China.

Magnus Lundgren / Wild Wonders of China / Yellow prawn-goby (Cryptocentrus cinctus) Sharp Island or Kiu Tsui Chau, Kiu Tsui Country Park located at Port Shelter of Sai Kung, Hong Kong, China.

Claudio Contreras / Redhead goby (Elacatinus punticulatus), Espiritu Santo National Park, Sea of Cortez (Gulf of California), Mexico, February

Claudio Contreras / Redhead Goby (Elacatinus punticulatus), Espiritu Santo National Park, Sea of Cortez (Gulf of California), Mexico, February

David Fleetham / Steinitz' prawn / shrimp goby (Amblyeleotris steinitzi) and Alpheid worker shrimp (Alpheus sp) side by side. Mutualism occurs between the two species, the blind shrimp maintaining the shared burro...

David Fleetham / Slender spongegoby (Phyllogobius platycephalops) and two Crabs of different species on Sponge. Several parasites with egg cases on the side of the Goby. Philippines.

David Fleetham / Wire coral goby (Bryaninops yongei) with polyps extended on Wire coral (Cirrhipathes sp). Hawaii.

Alex Mustard / Pair of Michel's gobies (Pleurosicya micheli) laying eggs on an area of hard coral that they have cleared of coral tissue. The male is the larger individual, the female has a swollen belly. Bitung, No...

Linda Pitkin / Sharknose goby (Elacatinus evelynae) on star coral Bonaire, Leeward Antilles, Caribbean.

Franco Banfi / Rounded bubblegum / Bubble coral (Plerogyra sinuosa) with two Gobies (Gobiidae) on it, Lazi Pier, Dumaguete, East Negros Island, Central Visayas, Philippines, Pacific Ocean.

Franco Banfi / Goby (Bryaninops loki) pair on a Wire coral, My Paradise Reef, Cabilao Island, Bohol, Central Visayas, Philippines, Pacific Ocean.

Alex Mustard / A large whip goby (Bryaninops amplus) on a whip coral against blue water. Sangeang Island, Sumbawa, Indonesia. Flores Sea.

Bert Willaert / Steinitz' Shrimp goby (Amblyeleotris steinitzi), Kimbe Bay, West New Britain, Papua New Guinea

Bert Willaert / Wire coral goby (Bryaninops youngei) on yellow wire coral (Cirripathes anguina). Bismarck Sea, Vitu Islands, West New Britain, Papua New Guinea

Franco Banfi / Goby (Bryaninops sp) on coral branch, Tubbataha Reef Natural Park, UNESCO World Heritage Site, Sulu Sea, Cagayancillo, Palawan, Philippines

Alex Mustard / Whip goby (Bryaninops sp.) with copepod parasites (with characteristic coiled egg mass) on a whip coral. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Linda Pitkin / Ward's sleeper goby (Valenciennea wardii) Lembeh Strait, North Sulawesi, Indonesia.

David Fleetham / Red-banded prawn-goby (Amblyeleotris fasciata) Yap, Micronesia.

Tony Wu / Red-margin shrimp goby (Amblyeleotris rubrimarginatus) Bootless Bay, Papua New Guinea

Tony Wu / Dinah's gobies (Lubricogobius dinah) pair in their beer-bottle home, found at a depth of 30 metres at Observation Point in Milne Bay Province, Papua New Guinea

Tony Wu / Dinah's gobies (Lubricogobius dinah) pair in their beer-bottle home, found at a depth of 30 metres at Observation Point in Milne Bay Province, Papua New Guinea

Tony Wu / Dinah's gobies (Lubricogobius dinah) pair in their beer-bottle home, found at a depth of 30 metres at Observation Point in Milne Bay Province, Papua New Guinea

Tony Wu / Dinah's gobies (Lubricogobius dinah) pair in their beer-bottle home, found at a depth of 30 metres at Observation Point in Milne Bay Province, Papua New Guinea

Tony Wu / Yellow shrimp goby (Cryptocentrus cinctus) Waga Waga in Milne Bay, Papua New Guinea

Tony Wu / Orange-dashed goby (Valenciennea puellaris) with its mouth open after spitting out a mouthful of sand as it was foraging for food, Ambon, Indonesia

Tony Wu / Wire coral goby (Bryaninops yongei) Lembeh Strait, North Sulawesi, Indonesia

Alex Mustard / Two-spot gobies (Gobiusculus flavescens) school swims over Kelp (Laminaria sp). Porthkerris, Lizard Peninsular, Cornwall, UK, August

Alex Mustard / Whip coral goby (Bryaninops amplus) on coral, Anilao, Batangas, Luzon, Philippines. Verde Island Passages, Pacific Ocean.

Aflo / Group of three Fire gobies (Nemateloeotris magnifica) swimming, Japan.