Yes, but the estuary where the salt water meets the fresh water is the Louisiana Swamps
freshwater
The Mississippi River
Utah lake
Because of the high discharge of freshwater
bull sharks are in the Mississippi river and therefor they are in Wisconsin. Bull sharks are abundant in the lower Mississippi River and are also found in Minnesota up the Mississippi. Bull sharks have also been reported in an attack in Lake Michigan, possibly up the St. Lawrence River from saltwater to freshwater.
According to discovery channels website for shark week, Mississippi River is one of "Shark freshwater hot spots." There could most definitely be freshwater sharks in the Mississippi River, probably mostly bull heads because they can adapt very easily to freshwater. Although this is a possibility you should not be worried because shark attacks are not common.
Great lakes
They have the most testosterone of any creature in the animal kingdom. And they can live in freshwater. They have been found in the Mississippi and Great Lakes.Nice shark!
usually freshwater.......
Flounders are saltwater fish, some can be kept temporarily in brackish water.
The most common term for the study of freshwater and freshwater systems is Limnology!
Freshwater