one of the theories up here are that the sharks are having there food decimated out wide so are finding new areas to feed in closer and once here are learning that boats and engines means an easy food source ,hence the one that followed me last monday for a few k.one of the guides was saying he can nearly tell the time it takes for sharks to start cruising around his boat once they know hes there .having young in this area will only add to the prob as they will learn this way of eating as well