<P> There are creatures however, which thrive around hydrothermal vents, or geysers located on the ocean floor that expel super heated water that is rich in minerals . These organisms feed off of chemosynthetic bacteria, which use the super heated water and chemicals from the hydrothermal vents to create energy in place of photosynthesis . The existence of these bacteria allow creatures like squids, hatchet fish, octopuses, tube worms, giant clams, spider crabs and other organisms to survive . </P> <P> Due to the total darkness in the zones past the epipelagic zone, many organisms that survive in the deep oceans do not have eyes, and other organisms make their own light with bioluminescence . Often the light is blue green in colour, because many marine organisms are sensitive to blue light . Two chemicals, luciferin and luciferase that react with one another to create a soft glow . The process by which bioluminescence is created is very similar to what happens when a glow stick is broken . Deep - sea organisms use bioluminescence for everything from luring prey to navigation . </P> <P> Animals such as fish, whales, and sharks are found in the oceanic zone . </P>

What are the boundaries of the open ocean