Why? It's unlikely that you'd find multiple parasites like that given it's a novel-enough story to make news in the first place. Even in Australia, this doesn't

Why? It's unlikely that you'd find multiple parasites like that given it's a novel-enough story to make news in the first place. Even in Australia, this doesn't normally happen when you wade in to the ocean. Moreover, it's likely that certain tides had washed a population of them into the beach (Melbourne's beaches are in a huge bay - Port Phillip bay - and the marker [1] indicates Brighton where he swam) so they're unlikely to disperse too quickly until a tide/weather change shifts them back out or disperses them throughout the bay. Additionally, if I recall correctly there's been wind/rain across Melbourne from the south-east over the last weekend, which would also wash them towards the Brighton side of the bay. [1]: https://goo.gl/maps/WzQX4UDpp6k https://goo.gl/maps/WzQX4UDpp6k