A small shark swimming around a Louisiana aquarium holds a mystery in its DNA. Yoko the swell shark hatched from an egg that was discovered in a puzzling place — an all-female tank, the Shreveport ...

yet the two female sharks present in the tank have not been in contact with a male in over three years. The team at the aquarium suspects the birth could be delayed fertilization or a rare ...

Yoko the swell shark was born in a habitat of all-female sharks who hadn't seen a male in years. The aquarium has two ...