There are many hundreds of species of ray-finned fish found at all of the dive sites while diving Koh Lanta. A subclass of the bony fishes, the fins are constructed from webs of skin supported by bony or horny spines.
They are the dominant aquatic vertebrates today, making up about half of all vertebrate species known. Any animal with a back-bone is called a vertebrate.
Ray-finned fish are found in every aquatic habitat from the deepest depths of the ocean to freshwater streams and ponds; a few can even crawl on land for short periods of time (we have mudskippers around the mangroves here on Koh Lanta).