The Gröndahl family had taken the boat into town to shop when they found the shark on Fisktorget in central Karlskrona and immediately contacted the County Administrative Board.

- As far as I know, it has never been found in the Baltic Sea and only a few times on the west coast, says Jenny Hertzman, marine biologist at the County Administrative Board in Blekinge.

The blue jaw usually lives its life in the Skagerrak - at a depth of between 200-700 meters. It is the smallest shark species in the North Atlantic and rarely grows larger than 50 centimeters.

Now one of the mini sharks has washed ashore on Trossö in Karlskrona, where Harry Gröndahl and his little brother Tage, 3, found it dead. Both are interested in animals and have their own shark book.

This is the first time Blåkäkxan has been found in the Baltic Sea.

The shark is red-listed and considered vulnerable in Sweden.