We all know the dangers of swimming in the ocean(Sharks) what are the
dangers of swimming in a lake?

Is there any kind of really bad ass fish or something like that?

I know crocodiles and alligators. But the lake I'm thinking of
doesn't have those. So besides crocs and alligators what in a lake
could kill you?

You know what really freaks me out is seaweed, hate to be swimming in
some seaweed, that shit is gross don't you think?