Alex Mustard / Forest of sugar kelp (Saccharina latissima) growing in shallow water in north east Iceland. North Atlantic Ocean.

Alex Mustard / Scenic view of a bull kelp forest (Nereocystis luetkeana) in a current. Browning Pass, Port Hardy, Vancouver Island, British Columbia. Canada. North East Pacific Ocean.

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 / Gas bladders of a giant kelp plant (Macrocystis pyrifera). Fortescue Bay, Tasmania, Australia. Tasman Sea. This is the same species of giant kelp which is widespread on the Pacific coast of North Amer...

Alex Mustard / A diver photographs in a giant kelp forest (Macrocystis pyrifera). Fortescue Bay, Tasmania, Australia. Tasman Sea. This is the same species of giant kelp which is widespread on the Pacific coast of No...