Shane Gross / Caribbean reef shark (Carcharhinus perezi) swimming over Manatee grass (Syringodium filiforme). Nassau, Bahamas.

Nick Upton / Velvet swimming crab (Necora puber) in a rock pool, hiding among Coralweed (Corallina officinalis), Cornwall, UK, March.

Nick Upton / Common shore crab (Carcinus maenas) hiding among Coralweed (Corallina officinalis) in a rock pool, Cornwall, UK, March.

Shane Gross / Schoolmaster snapper (Lutjanus apodus) shoal sheltering amongst Red mangrove (Rhizophora mangle) roots. Caribbean Sea off Gardens of the Queen National Park, Cuba.

Shane Gross / Sea anemone in the middle of a vast seagrass bed attracts a hub of sealife. North Sulawesi, Indonesia.

Shane Gross / Schoolmaster snapper (Lutjanus apodus) in red mangrove(Rhizophora mangle) and turtlegrass (thalassia testudinum) habitats, Eleuthera Island, Bahamas.

Shane Gross / Nocturnal Caribbean spiny lobster (Panulirus argus) at night crawling in the Seagrass (Thalassia testudinum) looking for food. Eleuthera, Bahamas.

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

Juergen Freund / Saddleback clownfish (Amphiprion polymnus) surrounded by marine trash around its anemone home, Sulawesi, Indonesia. November.

Shane Gross / Queen conch (Lobatus gigas) feeding on the algae growing on seagrass (Thalassia testudinum) Exuma, Bahamas

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

Magnus Lundgren / Wild Wonders of China / Barnacles and oysters on mangrove in Ha Pak Nai, a mudflat in the Yuen Long District, Hong Kong, China.