What happened to North American coastal waters when the great white shark population decreased

As an AI language model, I don't have current or specific knowledge of the current state of North American coastal waters, but historically, the decrease in the great white shark population could have had an impact on the marine ecosystem. Since great white sharks are apex predators, their decline could have caused a decrease in the populations of their prey animals, which could have in turn affected the populations of other species in the food chain. It could have also changed the behavior of other marine animals, as they adapt to the absence of this key species.