The Shreveport Aquarium in Louisiana is investigating the mysterious birth of a baby swell shark, despite no male sharks being present in the tank for three years.

The arrival of a baby swell shark at an aquarium in Louisiana has caused a wave of excitement, after the egg hatched despite the fact that no male sharks appear to have been involved.

The birth of a baby shark at Shreveport aquarium has flummoxed marine experts. The newborn hatched in a tank with no male presence and whose only inhabitants were female sharks.