What is "branteviksalen"

Branteviksålen was a European eel (Anguilla anguilla) that is believed to have lived for more than 150 years.

The eel was released into a well in the town of Brantevik, Sweden in 1859 by an eight-year-old boy, Samuel Nilsson. On 7 August 2014, the eel was reported to have died and sent to an expert who determined the eel's actual age to be over 150 years.

The eel's head, presumed lost, was recovered later in a fridge. SVT's nature show Mitt i naturen extracted the eel from the well at one point, but eventually released it.