Nudibranchs Of Koh Tao

Nudibranchs or sea slugs is a name normally given to any marine gastropod without a shell or a reduced one, such as nudibranchs, Pleurobranchs, Sea Hares, Sap Sucking slugs, and Bubble Snails and Headsheild Slugs. Members of each of these species, plus many more, can be found when diving around Koh Tao. Nudibranchs are the most diverse and variable of this type of species to be found are the island.  Nudi means naked and branches refer to gills!.. Naked Gills!


Nudibranches come in a great variety of shapes, colors, sizes, and body styles.  For example the rhinophores (ear-like structures that can sense and taste) that can be smooth, retractable, sheathed, lamellate, or papillate.  The oral tentacles could be short and blunt, long and exposed, or heavily reduced.  Some have cerata (sort of horns that extend the surface area of nudibranchs and aid in respiration) while others have dorsal appendages and others may be smooth or bumpy that may do the same job.  We still have a lot to learn. Many don’t grow longer than a few millimeters but some can grow to 20cm.


Where Can You Find Them?

They live under the sand, crawl along the seafloor, swim in the water column and some are like plankton living just below the waves.

Nudibranch Jorunna funebris

One of the most widespread and abundant nudibranchs found around Koh Tao

What Do They Do?

One of the common traits of these creatures is how they defend themselves, they have chemicals with which to protect themselves from predators.  Some do retain an internal or external shell to some degree as well as chemical protection.   Also, they are widely studied as an important indicator of biodiversity in a healthy marine ecosystem.  Koh Tao is known to have very healthy marine life.

Koh Tao diving has a great variety of marine life to offer fun divers, those who are learning to dive, and snorkelers. You don’t have to go diving to see the underwater life but it does help. We don’t have much of the “big stuff” but we do get whale sharks, mostly at the deeper dive sites. But we do have lots of underwater life to enjoy. Here are just some of the marine life you can see.

Want To Know More About Koh Tao Marine Life?

So if you are interested in learning about Koh Tao marine life you can study the Fish Identification or Marine Ecology courses online.  If you would like to more about scuba diving certifications on Koh Tao contact us and you can find out more about the diving we offer by clicking on the links below or follow us on Facebook or Instagram.

Other Koh Tao Scuba Diving Courses

Want To Know More?

Find out more about SSI here: Dive SSI