Sharks (Elasmobranch) are a cartilaginous skeleton group of fish. They have 5-7 gill slits on the sides of their head and pectoral fins on their back.   Sharks are incredible hunters and have amazing senses that keep them at the top of the ocean food chain. Our oceans rely on sharks to maintain the balance of the marine ecosystem. One-third of the world's shark species have been listed as "threatened" by the International Union for Conservation of Nature.  I have often encountered these majestic animals when I have been diving and fishing. They have inspired my art. I have never felt afraid or the need to defend myself.  I respect that without sharks the ocean will not stay healthy.