What is unusual about Lake Nicaragua?

Answer 1

Originally it was thought to be a separate species but it actually is the bull shark which is known for swimming up rivers. Bull sharks have been known to attack people many miles up the Mississippi and other world rivers.

Bull sharks tagged in the lake have been found later in the Caribbean and vice versa. I forgot the river's name the sharks swim up. hope that helps.

Answer 2

Lake Nicaragua is the largest lake in Central America, and like most lakes, it is comprised of freshwater. What makes it unusual is that saltwater species have been found in this lake, such as Tarpon, Saw-fish, and sharks. It was thought that the sharks were a different species particular to that lake, but come to find out they are actually Bull sharks, who have been known to swim up freshwater rivers.