According to Swedish Radio P4 Kristianstad, it was the oldest eel in the world.
The eel was discovered dead when the well's owner, Tomas Kjellman was going to show the eel to visitors.
The eel was thrown into the well in 1859 by 8-year-old Samuel Nilsson and has since then appeared regularly in newspapers and television throughout the years.
Now the eel has been frozen and is going to be transported to the Institute of Freshwater Research in Stockholm where they will conduct an autopsy in the hopes of answering exactly how old the eel was.
"It is obviously a little sad, but at the same time it can be exciting to see what they discover up at the Institute of Freshwater Research," Kjellman told Swedish Radio's local station in Kristianstad.