Shark gives birth to pup despite living in tank WITHOUT males for 3 years – shocked scientists share bombshell theory A SWELL shark egg has hatched a pup, despite being found in a tank with no males, stunned researchers at a Louisiana aquarium have announced.
"We’re thrilled to announce the hatching of a new swell shark pup - without a male present," the aquarium wrote in a Facebook post.
"This does suggest that either a phenomenon called parthenogenesis, a rare form of asexual reproduction, or delayed fertilisation, where fertilisation occurs long after mating, may have occurred.".
The swell shark pup, called Yoko, hatched on 3 January, and has been closely monitored ever since.
Though the aquarium's husbandry team say the egg could have gone unnoticed for an additional two months prior.
