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