Snakelocks anemone (Lat. Anemonia viridis). Is a sea anemone found in the eastern Atlantic Ocean and the Mediterranean Sea. It lives attached to rocks on the low shore and in shallow seas down to about 12m. On average the snakelock anemone is 8 cm wide. The tentacles are usually a deep green colour with purple tips, the green colour is often attributed to the presence of symbiotic algae within the tentacles but is actually the result of the presence of green fluorescent protein that makes them glow fluorescent green under ultraviolet light. The anemone tissue contains a symbiotic algae called zooxanthellae, which is necessary for the long-term survival of the sea anemone. When the numbers of algae diminish the anemone may appear dull grey in colour. The algae need light to flourish, so this anemone will be found in the sunniest pools. It is carnivorous, feeding on tiny plankton or fish. Its stinging tentacles are triggered by the slightest touch, firing a harpoon-like filament called a nematocyst into their prey. Once injected with the paralyzing neurotoxin, the prey is guided into the mouth by the tentacles.