A female zebra shark conceived her pups through 'virgin birth,' despite sharing a tank with two males.
A female zebra shark has given birth by fertilizing her own eggs, despite sharing a tank with two healthy males who likely would have been eager to help, reports a new study in the Journal of Fish Biology . This unusual scenario challenges prior assumptions about the risks and benefits of parthenogenesis — a form of asexual reproduction sometimes nicknamed"virgin birth" — according to the study's authors.
A number of bird, reptile, amphibian and fish species use parthenogenesis as a biological back-up plan for reproducing when mates are hard to come by. But the process can be risky; animals born via parthenogenesis generally have shorter lifespans and are often sterile, which may explain why vertebrate species capable of asexual reproduction seldom choose to utilize it unless they're out of options.
Beyond genetics, there were other suspicious signs. Although pups normally hatch on their own, aquarium staff had to cut open the pups' egg cases; both pups ultimately survived only a matter of months. Related stories—Mysterious 'nightmare' shark with unnerving human-like smile dragged up from the deep sea—Grisly new footage shows orcas attacking a great white shark and eating its liver
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