As well, we've include some of the special 'regulars' of Phuket - life forms that you can see here more often than in other dive destinations. We've also included some masters of camouflage, which may require a trained eye to recognize. All sharks and rays belong to the class of cartilaginous fishes. Their skeleton is built of hardened cartilage, as opposed to bone. The body muscles are joined to the spine by connective tissues.
All cartilaginous fishes are carnivores.
They have electro-sensitive pores on their head to track down their prey. Cartilaginous fishes reproduce partly oviparous, partly viviparous. Unlike bony fishes, fertilization of the eggs happens inside the females. Many species of cartilaginous fishes, in particular sharks, are endangered. Every year, tens of millions die in floating nets and in the commercial hunt for shark fins.