Hi Jr17322 - welcome to the forums!
The issue with sharks swimming in the shallows is seperate to the one Dank-a-licous posted above and the team are aware of it. We have a known issues post on it here - [Known Issue] Sharks clipping through land and objects - which contains more information about the issue itself as well as some potential workarounds. If your experience differs from those mentioned in the main post, please let us know in the comments 