Alex Mustard / Spotlight goby (Gobiosoma louisae) looking out from inside a Yellow tube sponge (Aplysina fistularis), growing on a coral reef. Bloody Bay Wall, Little Cayman, Cayman Islands, British West Indies. Car...

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.

Alex Mustard / Pair of Common ghostgobies (Pleurosicya mossambica) spawning on a pink sponge. The male is the larger fish on the right. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Tony Wu / Common ghost goby (Pleurosicya mossambica) diligently guarding its brood of eggs on the surface of a sponge, in the muck at Lembeh Strait, North Sulawesi, Indonesia.

Alex Mustard / Translucent goby (Bryaninops erythrops) rests on sponge (Pione vastifica) covered in spionid worms (Polydorella smurovi) Nuweiba, Sinai, Egypt. Gulf of Aqaba, Red Sea.

Alex Mustard / Translucent goby (Bryaninops erythrops) on red sponge (Pione sp.) Sinai, Egypt. Red Sea.

Michele Westmorland / Dwarf goby (Bryaninops sp) on Ianthella sponge, Papua New Guinea

Michele Westmorland / Dwarf goby (Bryaninops sp) on Ianthella sponge, Papua New Guinea

Juergen Freund / Sponge (Porifera) with Goby and shrimp, Caribbean Sea

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

Alex Mustard / RF - Common ghostgoby (Pleurosicya mossambica) camouflaged on a colourful encrusting sponge, Batanta Island, Raja Ampat, West Papua, Pacific Ocean. (This image may be licensed either as rights managed...