About

Sea Squirts are an interesting bunch! As adults, they live permanently attached to rocks under the sea and are pretty simple animals. However, before settling down, they start life as a tadpole-like larvae. Once they find a suitable spot to settle, they start by digesting their own brain, tail and spine-like structure called a notochord, before metamorphosising into adults! Adult sea squirts are a barrel-shaped animal with 2 holes at the top end - each is a siphon, one for taking water in and one for pushing water out. Their simple sac-like bodies are covered by a protective layer called a tunic - this is where they get their other name, Tunicates, from. Sea squirts are filter feeders and take in seawater using one siphon (inhalent), from which they filter out plankton and detritus; expelling the wastewater from the other siphon (exhalent). There are many different types of sea squirt found in UK seas, some live alone but many live in colonies. The lightbulb sea squirt is colonial and common around much of the UK, found living on rocks and bounders down to depths of 50m. It is also often found living in harbours and marinas. They get their name as they really do look a lot like a lightbulb! They have a transparent tunic and a creamy-white line along their length and forming a ring on top.