Shark pup Yoko was born in early January, Shreveport Aquarium said, having hatched from an egg in a tank containing two ...

including the zebra shark and whitespotted bamboo shark. It is also thought to have occurred in one species of ray. Parthenogenesis usually happens when females are isolated from males ...

However, because the female and male sharks have been without contact for more than a decade, this seems unlikely, Barrick said. The current record for delayed fertilization is held by a bamboo ...

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 possible explanations — and hopes to get confirmation in the coming months.