Marine life may seem attractive and apparently harmless, but not all species are so. There are some species which are small to look at but extremely venomous. Some of them too small or too well hidden, they pose a high threat to divers.
Species like the Scorpion fish, which includes the Stonefish, quietly lie in wait for their prey. They have sharp spines which are associated with venom glands. When these spines come in contact with human skin, the fish injects a powerful neurotic. This results in immediate nausea followed by cardio respiratory insufficiency, sweating and fever. The effect of the sting can be reduced by soaking the affected area in hot water.
Even the coral reefs like the Yellow fire Coral are a bit dangerous. This coral species launches thousands of tiny poisonous darts upon contact. Wetsuits offer some protection, but the best protection can be had by avoiding any contact or playing with any of the creatures, seen leaning against the corals and walking on reef tops.