Jason Smalley / Youngsters pond dipping on a nature reserve, UK.

Pascal Kobeh / Colony of Red sea urchins (Strongylocentrotus franciscanus) at the feet of Bull kelps (Nereocystis luetkeana) Vancouver Island, British Columbia, Canada. Pacific Ocean.

Alex Mustard / Red Irish lord (Hemilepidotus hemilepidotus) hides on the seabed, with Quillback rockfish (Sebastes maliger) and copper rockfish (Sebastes caurinus) behind in the bull kelp forest. Browning Pass, Vanc...

Alex Mustard / Hooded nudibranchs (Melibe leonina) filter feeding beneath bull kelp. Hussar Point, Browning Pass, Port Hardy, Vancouver Island, British Columbia, Canada.

Alex Mustard / Young yellowtail rockfish (Sebastes flavidus) shelter below bull kelp (Nereocystis luetkeana). Browning Pass, Vancouver Island, British Columbia, Canada. North East Pacific Ocean.

Alex Mustard / Black rockfish (Sebastes melanops) in bull kelp (Nereocystis luetkeana), Browning Pass, Port Hardy, Vancouver Island, British Columbia, Canada.

Alex Mustard / Copper rockfish (Sebastes caurinus) swimming through a kelp forest (Nereocystis luetkeana), Browning Pass, Vancouver Island, British Columbia, Canada, Queen Charlotte Strait, Pacific Ocean.

Alex Mustard / A huge, seasonal gathering of Hooded nudibranchs (Melibe leonina) on Bull kelp (Nereocystis luetkeana) in a sheltered bay, Browning Pass, Vancouver Island, British Columbia, Canada, Queen Charlotte St...

Alex Mustard / A huge, seasonal gathering of Hooded nudibranchs (Melibe leonina) on Bull kelp (Nereocystis luetkeana) in a sheltered bay, Browning Pass, Vancouver Island, British Columbia, Canada, Queen Charlotte St...

Alex Mustard / Stiletto shrimp (Heptacarpus stylus) crawling down the twisted stipes of Bull kelp (Nereocystis luetkeana), Browning Pass, Vancouver Island, British Columbia, Canada, Queen Charlotte Strait, Pacific O...

Alex Mustard / Split level view of Bull kelp (Nereocystis luetkeana) growing up to the surface with temperate rainforest behind, Port Hardy, Vancouver Island, British Columbia, Canada, Queen Charlotte Strait, Pacifi...

Shane Gross / Bull kelp (Nereocystis luetkeana) flowing in the currents, Browning Pass, British Columbia, Canada, Pacific Ocean.

Shane Gross / School of Black rockfish (Sebastes melanops) sheltering in Bull kelp forest (Nereocystis luetkeana) in Browning Pass, British Columbia, Canada. North East Pacific Ocean. September.

Shane Gross / Brooding anemone (Epiactis lisbethae) attached to Bull kelp (Nereocystis luetkeana), Browning Pass, Queen Charlotte Strait, Vancouver Island, British Columbia, Canada.

Shane Gross / Proliferating anemones (Epiactis prolifera) on Bull kelp (Nereocystis luetkeana), Browning Pass, Queen Charlotte Strait, British Columbia, Canada.

Shane Gross / Reef scene including red soft coral (Gersemia rubiformis), Giant plumose anemone (Metridium senile) and Bull kelp (Nereocystis luetkeana), Vancouver Island, British Columbia, Canada, Pacific Ocean.

Alex Mustard / School of black rockfish (Sebastes melanops) shelter in a Bull kelp forest (Nereocystis luetkeana). Browning Pass, Port Hardy, Vancouver Island, British Columbia, Canada. Queen Charlotte Strait, North...

Alex Mustard / Black rockfish (Sebastes melanops) school shelter in a bull kelp forest (Nereocystis luetkeana). Race Rocks, Victoria, Vancouver Island, British Columbia, Canada. Queen Charlotte Strait, North East Pa...

Alex Mustard / Orange sunflower star (Pycnopodia helianthoides) beneath a forest of giant bull kelp (Nereocystis luetkeana). Browning Pass, Port Hardy, Vancouver Island, British Columbia, Canada. Queen Charlotte Str...

David Hall / Hooded nudibranchs (Melibe leonina) clinging to Bull kelp (Nereocystis luetkeana) as they slowly open and close their oral hoods to catch plankton at night, Nigei Island, Queen Charlotte Strait, Briti...

David Hall / Rose anemone (Urticina piscivora), Painted anemone (Urticina crassicornis), Brooding anemones (Epiactis spp.), Plumose anemones (Metridium spp.), Bull kelp (Nereocystis luetkeana) and Stalked kelp (Pt...

David Hall / Black rockfish (Sebastes melanops) amongst Bull kelp (Nereocystis luetkeana); Hunt Rock, Queen Charlotte Strait, British Columbia, Canada. September.

David Hall / Black rockfish (Sebastes melanops) amongst Bull kelp (Nereocystis luetkeana); Hunt Rock, Queen Charlotte Strait, British Columbia, Canada. September.

David Hall / Black rockfish (Sebastes melanops) with Bull kelp (Nereocystis luetkeana). Seven Tree Island, Browning Pass, Queen Charlotte Strait; British Columbia, Canada. October.

David Hall / Hooded nudibranchs (Melibe leonina) with oral hood for catching planktonic prey. In the Pacific Northwest they are often found clinging to bull kelp (Nereocystis luetkeana). Nigei Island, Queen Charlo...

David Hall / Hooded nudibranchs (Melibe leonina) clinging to bull kelp (Nereocystis luetkeana) at night split level sho, . Nigei Island, Browning Pass, Queen Charlotte Strait, British Columbia, Canada. September.

David Hall / Hooded nudibranchs (Melibe leonina) clinging to the kelp (Nereocystis luetkeana) split level shot. Nigei Island, Queen Charlotte Strait, British Columbia, Canada. September.

David Hall / Hooded nudibranchs (Melibe leonina) clinging to the kelp (Nereocystis luetkeana) split level shot. Nigei Island, Queen Charlotte Strait, British Columbia, Canada. September.

David Hall / Mixed aggregation of rockfishes (Sebastes spp.) with Bull kelp (Nereocystis luetkeana), Hunt Rock, Queen Charlotte Strait, British Columbia, Canada.

David Hall / Hooded nudibranchs (Melibe leonina) clinging to Bull Kelp (Nereocystis luetkeana). Nigei Island, Queen Charlotte Strait, British Columbia, Canada. September.

David Hall / Bull kelp canopy (Nereocystis luetkeana) floating on the surface providing protective habitat for juvenile Rockfishes (Sebastes spp.) Browning Pass, Queen Charlotte Strait, British Columbia, Canada. S...

David Hall / Bull kelp (Nereocystis luetkeana) split level shot in Queen Charlotte Strait, British Columbia, Canada. September.

David Hall / Bull kelp (Nereocystis luetkeana) above and below sea surface, Queen Charlotte Strait, British Columbia, Canada. September

David Hall / Black rockfish (Sebastes melanops) with Bull kelp (Nereocystis luetkeana) Browning Pass, Queen Charlotte Strait, British Columbia, Canada. September.

David Hall / Proliferating anemones (Epiactis prolifera) and Kelp lace bryozoans (Membranipora serrilamella) on Bull kelp (Nereocystis luetkeana), Browning Pass, Queen Charlotte Strait, British Columbia, Canada. S...

David Hall / Hooded nudibranchs (Melibe leonina) on Bull Kelp (Nereocystis luetkeana). These unusual nudibranchs possess an 'oral hood' which is used to capture plankton. Nigei Island, Queen Charlotte Stra...

David Hall / Schooling rockfishes (Sebastes spp.) with Bull kelp (Nereocystis luetkeana). Different species of rockfish often swim together in mixed schools, as here. Hunt Rock, Queen Charlotte Strait, British Col...

David Hall / Lion's mane jellyfish (Cyanea capillata) and Bull kelp (Nereocystis luetkeana) Hunt Rock, Queen Charlotte Strait, British Columbia. October.

David Hall / Northern kelp crab (Pugettia producta) large adult male is clinging to strands of bull kelp (Nereocystis luetkeana). Nigei Island, Queen Charlotte Strait, British Columbia. September.