Nick Hawkins / American lobster (Homarus americana) in eelgrass (Zostera marina). Nova Scotia, Canada. July

Gary Bell/ Oceanwide / Eelgrass (Zostera tasmanica), Hopkins Island, South Australia, Australia

Shane Gross / School of Striped eel catfish (Plotosus lineatus) move through seagrass, eating the algae growning on the seagrass blades. Manado, Indonesia.

Nick Hawkins / Invasive European green crab (Carcinus maenas) with eel grass (Zostera marine) in Kejimkujik Seaside National Park, Nova Scotia, Canada. July.

Nick Hawkins / Common eel grass (Zostera marina) in Kejimkujik Seaside National Park, Nova Scotia, Canada. July.

Nick Hawkins / An Atlantic polluck (Pollachius pollachius) swimming over a patch of eelgrass (Zostera marina). Nova Scotia, Canada. September

SCOTLAND: The Big Picture / Seagrass (Zostera marina) bed, Scotland, UK, May.

Alex Mustard / Spiny seahorse (Hippocampus guttulatus) female in a meadow of seagrass. (Zostera marina) Studland Bay, Dorset, England, UK. English Channel.

David Fleetham / Eel grass (Zostera) off the Wakatobi Resort, Indonesia.

Nick Hawkins / Atlantic herring (Clupea harengus) schoal of juveniles in eel grass beds, Nova Scotia, Canada, July.

Nick Hawkins / Lion's mane jellyfish (Cyanea capillata) swept in current over a bed of eel grass, along the Eastern shore of Nova Scotia, Canada, July.

Nick Hawkins / American / Northern lobster (Homarus americanus) juvenile taking shelter in Eel grass beds, Nova Scotia, Canada, July.