Alex Mustard / A heavily pregnant male White's Seahorse (Hippocampus whitei) grips onto the stipe of a kelp. Sydney Harbour, New South Wales, Australia, November.

Lewis Jefferies / Common hermit crab (Pagurus bernhardus) in Painted topshell, resting on Golden kelp (Laminaria ochroleuca) frond, encrusted with Lacy crust bryozoans (Membranipora membranacea), Lizard Peninsula, Corn...

Lewis Jefferies / Spiney squat lobster (Galathea strigosa) resting at night on Golden kelp (Laminaria ochroleuca) frond covered in Seamat (Membranipora membranacea), Lizard Peninsula, Cornwall, UK, Atlantic Ocean.

Lewis Jefferies / Grey seal (Halichoerus grypus) female, swimming upside down over Golden kelp (Laminaria ochroleuca) with sunrays, Lundy Island, Bristol Channel, Devon, UK.

Lewis Jefferies / Crystal jellyfish (Aequorea victoria) floating above Golden Kelp forest (Laminaria ochroleuca) Lundy Island, Bristol Channel, Devon, UK.

Lewis Jefferies / Grey seal (Halichoerus grypus) resting among Golden kelp forest (Laminaria ochroleuca), Lundy Island, Bristol Channel, Devon, UK.

Lewis Jefferies / Snakelocks anemone (Anemonia viridis) flowing in the current on frond of Golden kelp (Laminaria ochroleuca). Lamora Cove, West Cornwall, UK, Atlantic Ocean.

Lewis Jefferies / Golden kelp (Laminaria ochroleuca) with Spotted gobies (Gobiusculus flavescens) swimming in shallow water, backlit by the summer sunshine, Lamorna cove, West Cornwall, UK, Atlantic Ocean.

Lewis Jefferies / Golden kelp (Laminaria ochroleuca) forest, Lizard Peninsula, Cornwall, UK, Atlantic Ocean.

Henley Spiers / Bright sunrays and golden kelp in clear water, Shetland, Scotland, UK, North Sea. May.

Alex Mustard / Grey top-shell (Gibbula cineraria) grazing on Golden kelp (Laminaria ochroleuca). Pendennis Head, Cornwall, UK, English Channel.

Alex Mustard / Spiny starfish (Marthasterias glacialis) climbing amongst Golden kelp (Laminaria ochroleuca), Porthkerris, Cornwall, UK, English Channel.