I think the bull sharks there live in the river so they’ve just ventured away from there not come in from sea
[quote:24v2p5xt]Unlike most sharks, bull sharks tolerate fresh water and can travel far up rivers. They have even been known to travel as far up as Indiana in the Ohio River and Illinois in the Mississippi River, although there have been few recorded attacks. As a result, they are probably responsible for the majority of near-shore shark attacks, including many attacks attributed to other species. However, bull sharks are not true freshwater sharks (unlike the river sharks of the genus Glyphis).
Since bull sharks often dwell in shallow waters, they may be more dangerous to humans than any other species of shark, and, along with tiger sharks and great white sharks, are among the three shark species most likely to attack humans.