Solvin Zankl / Thongweed (Himanthalia elongata) edible plant sold as 'Sea Spaghetti' for human consumption. From Roscoff, France, April. Preserved specimen.

Solvin Zankl / Tiny crab on Broad-toothed Gulfweed (Sargassum fluitans) Sargassum Community. Sargasso Sea, Bermuda

Laurie Campbell / Common / Harbour Seal (Phoca vitulina) bottling / sleeping upright in water and moored in bed of sea thong weed, Islay, Scotland, April

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

Alex Mustard / A raft of sargasso weed (Sargassum natans) in open ocean. Off shore, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Sergio Hanquet / Gulfweed crab (Planes minutus), epibiont on Loggerhead turtle (Caretta caretta). Tenerife, Canary Islands.

David Woodfall / Sea weed collected in boom at low tide, used in pharmaceutical industry products. North Uist, Scotland, UK, July.

Nick Upton / Seaweeds including Thongweed / Sea thong (Himanthalia elongata), Tangleweed kelp (Laminaria digitata), Toothed wrack (Fucus serratus) and Dulse (Palmaria palmata). Exposed on rocky shore on low spring...

Nick Upton / Thongweed (Himanthalia elongata), young buttons in a rockpool. Near Falmouth, Cornwall, England, UK. September.

Ashley Cooper / Oil pollution in Lyme Regis harbour, probably from a fishing vessel, Dorset, UK. June 2012

Ashley Cooper / Plastic rubbish washed up at the singing sands on the west coast of the Isle of Eigg, Scotland, UK. May 2012

Ashley Cooper / Fishing net washed up at the singing sands on the west coast of the Isle of Eigg, Scotland, UK. May 2012

Ashley Cooper / Smashed concrete sea defences at Ulrome, Yorkshire, England, UK. August 2013.

David Fleetham / Sargassum fish (Histrio histrio) at the sea surface with floating sargassum weed. Hawaii.

Graham Eaton / Corkwing wrasse (Symphodus melops) by weed covered rocks, Hells Mouth (Porth Neigwl), Abersoch, Wales, UK August

Alex Mustard / Bootlace weed / Mermaid's hair (Chorda filum) Porthkerris, Lizard Peninsular, Cornwall, UK August

Alex Mustard / John Dory (Zeus faber) swims through a forest of Bootlace weed / Mermaid's hair (Chorda filum) Porthkerris, Lizard Peninsular, Cornwall, UK August

Solvin Zankl / Intertidal rocks covered in seaweeds, including brown algae: Toothed wrack (Fucus serratus), and Thongweed (Himanthalia elongata), red algae: left Chylocladia verticillata, middle Pepper Dulse (Osmu...

Georgette Douwma / Spiny devilfish (Inimicus didactylus) covered in weed. Lembeh, Sulawesi, Indonesia.

Graham Eaton / Velvet crab (Necora puber) on sea weed, Cardigan Bay, Wales, July,

Solvin Zankl / Sargasso weed (Sargassum fluitans) with Pugnose Pipefish (Syngnathus pelagicus). Sargasso Sea, Bermuda.

Solvin Zankl / Sargasso weed (Sargassum fluitans) with Pugnose Pipefish (Syngnathus pelagicus). Sargasso Sea, Bermuda.

Solvin Zankl / Common sargasso weed (Sargassum natans) from underwater, Sargasso Sea, Bermuda

Solvin Zankl / Common sargasso weed (Sargassum natans) on graph paper during scientific research. Sargasso Sea, Bermuda

Solvin Zankl / Sargasso Weed (Sargassum fluitans) and Corwith Cramer, a 134-foot steel brigantine, split level view, Sargasso Sea, Bermuda, April 2014.

Solvin Zankl / Scientists looking at Sargassum seaweeds, with Common sargasso weed on left (Sargassum natans) and Broad tooth gulf weed (Sargassum fluitans) Sargasso Sea, Bermuda

Solvin Zankl / Shrimp (Hippolyte coerulescens), Hydroids (Aglaophenia latecarinata) and Sargasso barnacles (Lepas pectinata) on Broad-toothed gulfweed (Sargassum fluitans) Sargasso Sea, Bermuda

Solvin Zankl / Sargassum nudibranch (Scyllaea pelagica) camouflaged in Broad-toothed gulfweed (Sargassum fluitans) Sargasso Sea, Bermuda

Andy Jackson / 2020VISION / Pink and orange Jewel anemone (Corynactis viridis) groups amongst red weed moving in tidal current, Muckle Flugga, Shetland, Scotland, UK, June.

Andy Jackson / 2020VISION / Pink and orange Jewel anemone (Corynactis viridis) groups amongst red weed moving in tidal current, Muckle Flugga, Shetland, Scotland, UK, June.

Sue Daly / Thongweed (Himanthalia elongata) Bouley Bay, Jersey, British Channel Islands.

Roger Powell / Pintail (Anas acuta) drake, feeding on weed on the sea. Varanger shore, Finmark, Norway, June.

MYN / Carsten Krieger / Rock pools and Thong Weed (Himanthalia elongata) during spring tide, Ross, County Clare, Republic of Ireland, May 2013. Meetyourneighbours.net project

MYN / Carsten Krieger / Thong Weed (Himanthalia elongata) during spring tide, Ross, County Clare, Republic of Ireland, May 2013. Meetyourneighbours.net project

MYN / Carsten Krieger / Thong Weed (Himanthalia elongata) from rock pool, County Clare, Republic of Ireland, August. Meetyourneighbours.net project

Nick Upton / Discoid forkweed (Polyides rotundus) growing in a rockpool alongside a feathery red alga (Ceramium sp.), Lyme regis, Dorset ,UK, May.

Nick Upton / Split level view of Japanese wireweed (Sargassum muticum), an invasive species from the western Pacific spreading in Europe and the UK, buoyed up by air bladders in a rockpool, Kimmeridge, Dorset, UK,...

Sue Daly / Thong Weed (Himanthalia elongata) juvenile, English Channel, off the coast of Sark, Channel Islands, July

Sue Daly / Thong Weed (Himanthalia elongata) English Channel, off the coast of Sark, Channel Islands, August

Sue Daly / Thong Weed (Himanthalia elongata) juvenile, English Channel, off the coast of Sark, Channel Islands, August

Sue Daly / Thong Weed (Himanthalia elongata) English Channel, off the coast of Sark, Channel Islands, July

Nick Upton / Common brittle star (Ophiothrix fragilis) well camouflaged among mix of red and green algae including Coralweed (Corallina officinalis), Harpoon weed (Asparagopsis armata) and Sea lettuce (Ulva lactuc...

Nick Upton / Gametophyte of Harpoon weed (Asparagopsis armata), an invasive red alga attached with barbed branchlets to Sea lettuce (Ulva lactuca) in a rockpool low on the shore, near Falmouth, Cornwall, UK, Augus...

Nick Upton / Colourful mix of Bushy rainbow wrack (Cystoseira tamariscifolia) with turquoise iridescent tips to its fronds and red Harpoon weed (Asparagopsis armata) surrounded by Coralweed (Corallina officinalis)...

Nick Upton / Feathery red alga (Plocamium sp.) growing alongside Coral weed (Corallina officinalis) in a rockpool, Crail, Fife, UK, July.

Nick Upton / Coral weed (Corallina officinalis) growing in a rockpool, North Berwick, East Lothian, UK, July

Danny Green / 2020VISION / European river otter (Lutra lutra) resting in sea weed, Isle of Mull, Inner Hebrides, Scotland, UK, December

Danny Green / 2020VISION / European river otters (Lutra lutra) resting in sea weed, Isle of Mull, Inner Hebrides, Scotland, UK, December

Danny Green / 2020VISION / European river otter (Lutra lutra) resting in sea weed, Isle of Mull, Inner Hebrides, Scotland, UK, December

Danny Green / 2020VISION / European river otter (Lutra lutra) resting in sea weed, Isle of Mull, Inner Hebrides, Scotland, UK, December

Danny Green / 2020VISION / Two European river otters (Lutra lutra) resting in sea weed, Isle of Mull, Inner Hebrides, Scotland, UK, December

Danny Green / 2020VISION / Two European river otters (Lutra lutra) resting in sea weed, Isle of Mull, Inner Hebrides, Scotland, UK, December

Danny Green / 2020VISION / Two European river otters (Lutra lutra) resting in sea weed, grooming each other, Isle of Mull, Inner Hebrides, Scotland, UK, December

Danny Green / 2020VISION / European river otters (Lutra lutra) resting in sea weed, with mouth open, Isle of Mull, Inner Hebrides, Scotland, UK, December

Danny Green / 2020VISION / Two European river otters (Lutra lutra) resting in sea weed, Isle of Mull, Inner Hebrides, Scotland, UK, December

Kevin Schafer / Marine otter (Lontra felina) cub sitting amongst sea weed, Punihuil Bay, Chiloe Island, Chile, Endangered

Roger Powell / Domestic Sheep (Ovis aries) on shoreline feeding on kelp weed to supplement diet, due to over grazing, Varanger fjord, Arctic Norway. June

Juergen Freund / WWF-Philippines staff with sea weed farmer, a former illegal logger at Sibuyan Island, Philippines

Norbert Wu / European Eel (Anguilla anguilla) live very deep in the Sargasso Sea and return to rivers as adults

Jeff Rotman / Giant kelp close-up of fronds and air bladders California USA Pacific {Macrocystis pyrifera} Channel Islands

Duncan Mcewan / Floating Knotted wrack {Ascophyllum nodosum}, Scotland

GEORGETTE DOUWMA / Giant kelp {Macrocystis pyrifera} showing gas filled pneumatocysts which keep it floating near surface. California, USA

Lewis Jefferies / Grey seal (Halichoerus grypus) amongst Serated wrack (Fucus serratus) and Thongweed (Himanthalia elongata) on seabed, Lundy Island, Bristol Channel, Devon, UK.

Lewis Jefferies / Grey seal (Halichoerus grypus) swimming over Thongweed (Himanthalia elongata) with Moon jellyfish (Aurelia aurita) in background, Lundy Island, Bristol Channel, Devon, UK.

Tui De Roy / San Cristobal lava lizard (Microlophus bivittatus) among endemic Galapagos carpet weed (Sesuvium edmonstonei). San Cristobal Island, Galapagos Islands, Ecuador.

Tui De Roy / Two Red-footed boobies (Sula sula), parent and chick, on nest among endemic plants including Galapagos carpet weed (Sesuvium edmonstonei) and Galapagos clubleaf (Nolana galapagensis). Galapagos Islan...

Tui De Roy / Nazca booby (Sula granti) landing amid endemic Galapagos carpet weed (Sesuvium edmonstonei). Galapagos Islands, Ecuador.

Tui De Roy / Endemic Galapagos carpet weed (Sesuvium edmonstonei) and Giant prickly pear cactus (Opuntia echios) by coastline. Plazas Island, Galapagos Islands, Ecuador.

Tui De Roy / Coastline with endemic Galapagos carpet weed (Sesuvium edmonstonei) and Galapagos clubleaf (Nolana galapagensis) growing. Galapagos Islands, Ecuador.

Tui De Roy / Two Blue-footed boobies (Sula nebouxii), parent and chick, at nesting site among endemic Galapagos carpet weed (Sesuvium edmonstonei) and Galapagos clubleaf (Nolana galapagensis). Galapagos Islands,...

Tui De Roy / Two Blue-footed boobies (Sula nebouxii), parent and chick, at nesting site among endemic Galapagos carpet weed (Sesuvium edmonstonei) and Galapagos clubleaf (Nolana galapagensis). Galapagos Islands,...

Graham Eaton / Bootlace weed (Chorda filum) on seabed in clear, shallow sea, Rhosneigr, Anglesey, Wales, Irish Sea, UK. July.

Nick Upton / Japanese wireweed / Japanese weed (Sargassum muticum) fronds dominating the seabed, near Swanage, Dorset, UK, English Channel. July.

Lucas Bustamante / Galapagos carpet weed (Sesuvium edmonstonei) on rocky clifftop, San Cristobal Island, Galapagos National Park, Galapagos Islands.

Alex Mustard / Wireweed (Sargassum muticum) dense stand growing up and across the surface of the sea, Looe, Cornwall, England, UK, English Channel.

Alex Mustard / Spaghetti seaweed (Himanthalia elongata) growing from a bed of smaller seaweeds, Island of Coll, Inner Hebrides, Scotland, UK, Atlantic Ocean.

Alex Mustard / Pollack (Pollachius pollachius) juveniles, swimming amongst Red pom-pom seaweeds (Ceramium sp.) and Spaghetti seaweed (Himanthalia elongata), Island of Coll, Inner Hebrides, Scotland, UK, Atlantic Oc...

Alex Mustard / Blue lion's mane jellyfish (Cyanea lamarckii) drifting through a seaweed forest with Red pom-pom seaweed (Ceramium sp.) and Spaghetti seaweed (Himanthalia elongata), Island of Coll, Inner Hebride...

Alex Mustard / Serrated wrack (Fucus serratus) and Spaghetti seaweed (Himanthalia elongata) growing in abundance on seabed, Island of Coll, Inner Hebrides, Scotland, UK, Atlantic Ocean.

Alex Mustard / Seaweed forest with Red pom-pom seaweed (Ceramium sp.) and Spaghetti seaweed (Himanthalia elongata), Island of Coll, Inner Hebrides, Scotland, UK, Atlantic Ocean.

Alex Mustard / Spaghetti seaweed (Himanthalia elongata) growing above Red seaweed (Ceramium sp.) and Kelp (Laminaria hyperborea) in shallow water, Talland Bay, Cornwall, England, UK, English Channel.

Alex Mustard / Spaghetti seaweed (Himanthalia elongata) in a tangled mass, growing in sunlight in shallow water, Talland Bay, Cornwall, England, UK, Englaish Channel.

Alex Mustard / Dense growth of Bootlace seaweed (Chorda filum) in shallow water in summer, with a single plant of invasive Wireweed (Sargassum muticum). Kimmeridge, Dorset, England, UK. English Channel. July.

Lewis Jefferies / Diverse array of algae species including Sargassum weed (Sargassum horneri), Kelp (Laminariales), Sea lettuce (Ulva lactuca) on shallow reef with juvenile Pollock (Pollachius pollachius) and Ballan wr...

Graham Eaton / Sea weed forest in shallow, temperate, tidal water, Porth Cwyfan, Anglesey, Wales, Irish Sea, UK. July 2021.

Tui De Roy / Galapagos carpetweed (Sesuvium edmonstonei) and giant Opuntia (Opuntia sp.) cacti, beneath a rainbow at sunset, Plazas Island, Galapagos, South America.

Tui De Roy / Galapagos carpetweed (Sesuvium edmonstonei) and giant Opuntia (Opuntia sp.) cacti, beneath a rainbow at sunset, Plazas Island, Galapagos, South America.

Alex Mustard / Male Fifteen spined stickleback / Sea stickleback (Spinachia spinachia) guarding a nest in Spaghetti seaweed / Thong weed (Himanthalia elongata), Isle of Coll, Inner Hebrides, Scotland, UK, North Atla...

Alex Mustard / Spaghetti seaweed / Thong weed (Himanthalia elongata) growing up to the water surface, Isle of Coll, Inner Hebrides, Scotland, UK, Atlantic Ocean. August.

Alex Mustard / Spaghetti seaweed / Thong weed (Himanthalia elongata) growing up from a bed of seaweed, Isle of Coll, Inner Hebrides, UK, Atlantic Ocean. August.

Alex Mustard / Spaghetti seaweed / Thong weed (Himanthalia elongata) flowing with the current, Inner Hebrides, Scotland, UK, Atlantic Ocean. August.

Alex Mustard / A tangle of Spaghetti seaweed / Thong weed (Himanthalia elongata) growing beneath the straight basalt columns outside Fingal's Cave. Isle of Staffa, Inner Hebrides, Scotland, UK, Atlantic Ocean. Augus...

Alex Mustard / Spaghetti seaweed / Thong weed (Himanthalia elongata) forest reaching up to the surface to absorb sunlight, Isle of Coll, Inner Hebrides, Scotland, UK, Atlantic Ocean. August.

Alex Mustard / Spaghetti seaweed / Thong weed (Himanthalia elongata) forest reaching up to water surface to absorb sunlight, Isle of Coll, Inner Hebrides, Scotland, UK, Atlantic Ocean. August.

Alex Mustard / Spaghetti seaweed (Himanthalia elongata) and Wireweed (Sargassum muticum) reflected in the calm surface of the sea, Cornwall, UK, English Channel.

Alex Mustard / Spaghetti seaweed (Himanthalia elongata), Cornwall, UK. English Channel.