the stone fish looks like a stone,just like the reef that it lives on.it also likes tosit on the sandy seabed.it has spines,though,that it uses to defend itself.they are very sharp and contain a nasty venom which can be very painful and something lethal.to avoid the stonefish's nastyng,you mustn't touch the reef while swiming and you should make sure you always wear shoes or sandals when walking in shallow.sandy water