Georgette Douwma / A group of five Reef stonefish (Synanceia verrucosa) in a mating congregation, the males jostling for position and swimming over the females. The female stonefish releases its eggs on the bottom of t...

Georgette Douwma / A group of six Reef stonefish (Synanceia verrucosa) in a mating congregation, the males jostling for position and swimming over the females. The female stonefish releases its eggs on the bottom of th...

Georgette Douwma / Stonefish (Synanceia verrucosa). This individual, having just shed its cuticle, is vivid pink, red and purple, resembling a coralline algae encrusted rock. It is one of the most venomous fish curren...

MYN / Sheri Mandel / Coralline algae (Corallinales spp.), Malibu, California, USA, February, meetyourneighbours.net project

Sue Daly / Coral Weed (Corallina officinalis) English Channel, off the coast of Sark, Channel Islands, July

Linda Pitkin / 2020VISION / Spiny starfish (Marthasterias glacialis), on rock covered in Crustose coralline algae (Corallinaceae), Lundy Island Marine Conservation Zone, Devon, England, UK, May.

Georgette Douwma / Coralline encrusting algae growing on dead coral patches on Porites, forming a hard calcaerous deposit. Encrusting algae plays an important role in the ecology of coral reefs providing a food source f...

Georgette Douwma / Coralline algae growing on dead coral patches on Porites, forming a hard calcaerous deposit. Encrusting algae plays an important role in the ecology of coral reefs, providing food for many tropical fi...

Nick Upton / Feathery red alga (Plocamium sp.) growing alongside Coral weed (Corallina officinalis) in a rockpool, Crail, Fife, UK, July.

Nick Upton / Coral weed (Corallina officinalis) growing in a rockpool, North Berwick, East Lothian, UK, July

Nick Upton / Coral weed (Corallina officinalis) growing in a rockpool, Crail, Fife, UK, July

Nick Upton / Coral weed (Corallina officinalis) growing in a rockpool, North Berwick, East Lothian, UK, July