Who is the great white sharks enemy?

The great white shark's considered an apex predator. It's at the top of the food chain. And it shares that #1 position with other apex predators of the air, ground, and water. But apex predators tend to respect each other's territories. So it's generally stated that the only enemy of the great white shark, and of other apex predators, is people. For people have an impact through hunting; and by the environmental degradation that affects the food chain, and water quality.