Juergen Freund / Sargassum seaweed (Sargassum sp) floating on the sea surface, Palawan, Philippines, May

Juergen Freund / Sargassum frogfish / anglerfish (Histrio histrio) in its floating Sargassum seaweed home, El Nido, Palawan, Philippines

Juergen Freund / Sargassum frogfish / anglerfish (Histrio histrio) in its floating Sargassum seaweed home, El Nido, Palawan, Philippines

Juergen Freund / Sargassum frogfish / anglerfish (Histrio histrio) in its floating Sargassum seaweed home, Miniloc island in the background, El Nido, Palawan, Philippines.

Norbert Wu / Atlantic Spotted Dolphin (Stenella frontalis) playing with Sargassum weed, Little Bahama Bank, Caribbean

David Shale / Sargassum frogfish (Histrio histrio) camouflaged on Sargassum seaweed off Cape Verde Islands, Atlantic. Seaweed floats in large masses on sea surface

Nick Upton / Japanese wireweed / Japanese weed / Japweed (Sargassum muticum), an invasive species from the western Pacific spreading in Europe and the UK, buoyed up by air bladders in a rockpool, Wembury, Devon, U...

MYN / Paul Marcellini / Sargassum anglerfish / frogfish (Histrio histrio) Biscayne National Park, Florida, USA, May. meetyourneighbours.net project

MYN / Paul Marcellini / Sargassum anglerfish / frogfish (Histrio histrio) Biscayne National Park, Florida, USA, May. meetyourneighbours.net project

MYN / Paul Marcellini / Sargassum crab (Portunus sayi) Biscayne National Park, Florida, USA, April. meetyourneighbours.net project

Juergen Freund / Sargassum seaweed (Sargassum sp) floating at the surface, split level, El Nido, Palawan, Philippines, May.

Juergen Freund / Sargassum frogfish / anglerfish (Histrio histrio) camouflaged amongst floating Sargassum seaweed, Palawan, Philippines.

Juergen Freund / Sample of Brown algae {Sarcassum cf myriosystum} from Coral Reef census, Lizard Island, Queensland, Australia, April 2008. To store the algae, specimens are pressed and dried out in a herbarium press,...

Juergen Freund / Sample of Brown algae {Sarcassum cf myriosystum} from Coral Reef census, Lizard Island, Queensland, Australia, April 2008. To store the algae, specimens are pressed and dried out in a herbarium press,...

Robert Thompson / Sargassum seaweed {Sargassum muticum} Ballyhenry Point, Strangford Lough, County Down, Northern Ireland, UK, September

Robert Thompson / Sargassum seaweed {Sargassum muticum} Ballyhenry Point, Strangford Lough, County Down, Northern Ireland, UK, September

Adrian Davies / Japweed {Sargassum muticum} alien introduced species of seaweed, Prawle Point, Devon, UK

Norbert Wu / Sargassum Weed (Sargassum sp) growing on bottom will break off to form large floating patches of sargasso weed, Bahamas, Caribbean

David Shale / Sargassum frogfish {Histrio histrio} Cape Verde Islands, Atlantic

GEORGETTE DOUWMA / Golden seahorse {Hippocampus whitei} amongst Sargassum weed, Sydney, Australia

GEORGETTE DOUWMA / Golden seahorse {Hippocampus whitei} amongst Sargassum weed, Sydney, Australia

Norbert Wu / Sargassum Nudibranch (Scyllaea pelagica) pair mating, snails ride amongst rafts of floating Sargassum seaweed, look almost exactly like the weed itself Papua New Guinea

Norbert Wu / Sargassum Frogfish (Histrio histrio) rides amongst rafts of floating Sargassum seaweed, looks almost exactly like the weed itself Papua New Guinea

Fred Bavendam / Sargassum Frogfish (Histrio histrio) camouflaged amongst Sargassum weed, Lembeh Strait, Indonesia

Fred Bavendam / Sargassum Frogfish (Histrio histrio) camouflaged amongst Sargassum weed, Lembeh Strait, Indonesia

Fred Bavendam / Sargassum Frogfish (Histrio histrio) camouflaged amongst Sargassum weed, Lembeh Strait, Indonesia

David Shale / Sargassum weed floating in open ocean provides a home for many creatures, Atlantic ocean

David Shale / Swimming crab amongst Sargassum weed {Sargassum sp} Atlantic ocean

David Shale / Shrimp camouflaged amongst Sargassum weed {Sargassum sp} Atlantic ocean

David Shale / Trigger fish living amongst Sargassum weed {Sargassum sp} Atlantic ocean

Juergen Freund / Sargassum frogfish (anglerfish) hidden on seaweed {Histrio histrio} Sulu-sulawesi seas, Indo-pacific ocean

Juergen Freund / Hawksbill turtle hatchling {Eretmochelys imbricata} hiding in sargassum seaweed. Sulu-Sulawesi seas, Indo Pacific. Split level shot.

GEORGETTE DOUWMA / Golden seahorse in Sargassum weed {Hippocampus whitei} Australia

Nick Upton / Japanese wireweed / Japanese weed / Japweed (Sargassum muticum), an invasive species from the western Pacific spreading in Europe and the UK, growing alongside native red and brown algae in a rockpool...

Hiroya Minakuchi / Atlantic Spotted Dolphin (Stenella frontalis) playing with Sargassum Weed (Sargassum sp), Bahamas, Caribbean

Norbert Wu / Atlantic Spotted Dolphin (Stenella frontalis) pair playing with Sargassum weed, passing it back and forth, Little Bahama Bank, Caribbean

Norbert Wu / Atlantic Spotted Dolphin (Stenella frontalis) group playing with Sargassum weed, passing it back and forth, Little Bahama Bank, Caribbean

David Shale / Sargassum frogfish {Histrio histrio} Cape Verde Is Atlantic