Scorpion fish are carnivorous bottom dwellers, which are characterized by poisonous back, anus and belly spines. The prey is sucked in at a speed of 10 milliseconds!
Warning: Their toxins cause very severe pain, vomiting, swelling, shortness of breath and fever.
First aid: To relieve the pain, immediately wrap the wound with a hot cloth for at least 40 minutes (or immerse the wound in hot water of approx. 45 degrees Celsius)! Have the wound examined by a doctor!

Excerpt from "Life in the Red Sea." iBooks.