Maybe because we drag the ocean of all life to eat, and have more humans hanging around than ever before?

Warming ocean temperatures mean sharks are spending more time in high-population areas

The state government keeps data on the numbers of marine animals caught in shark nets. Harcourt says if there was an explosion in shark numbers then a lot more would also be caught in those nets. But he says the data shows no significant changes.

There’s only one logical explanation: They’re learning.