Most species of Shark are successful predators. Thier Class -- Chondricthyes -- are cartilaginous fish, so they lack the strong, more rigid, (usually) calcium based skeletons of the Teleostes, or boney fishes, which are phylogenically (and evolutionarily) more modern. So sharks are typically more easily damaged than bony fish. However, sharks have a wide niche, a viable birthrate, are present in every ocean and even in some lakes and rivers. As such, I think it's fair to say they're very effective and successful predators.
are people predators to sharks than sharks are to humans
Yes sharks are predators to fish.
Their predators are great white sharks and killer whales.
Sharks are apex predators. They do not have any natural predators except other sharks. Large sharks are known to kill and eat smaller ones.
people, other fish, sharks and animals
about the only predator is people. unless that is you count dolphins believe it or not they are know to gang up on sharks and kill them.
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