Two-Headed Sharks Are Becoming More And More Common

Posted: Nov 7 2016, 7:48am CST | by , Updated: Nov 7 2016, 8:30am CST , in Latest Science News

Two-Headed Sharks are Becoming More and More Common
This two-headed blue shark fetus was discovered inside its mother in 2008 off Australia. Photograph Courtesy Christopher Johnston via NationalGeographic
  • Two-Headed Sharks are Getting more and more Common due to Overfishing

Two-headed sharks are getting more and more common due to overfishing. This is a source of worry for marine conservationists.

While two-headed sharks may seem to belong to the silver screen in some sci-fi movie like Sharknado, they in fact do exist in the real world. More and more of these strange creatures are turning up all around the world.

A couple of years ago, scientists opened the uterus of a bull shark which contained a two-headed fetus. Eight years ago, another man discovered a blue shark embryo which was two-headed too.

As for a 2011 study, it found conjoined blue shark twins that had been caught off the Gulf of California. Blue sharks have proven to produce the most two-headed embryos since they give birth to large litters.

Sometimes these litters consist of 50 or more blue shark embryos. Meanwhile, a catshark embryo was seen which resembled the two-headed blue shark embryo.

However, it had been found in an egg-laying species of shark, according to National Geographic. A question that automatically comes up is what is causing these two-headed shark embryos in such record numbers.

It may most likely be a genetic fault. Since the catshark’s embryos were raised in the lab, there were obviously mutations which took place along the way due to the artificial conditions.

While the lab technicians ensured that no chemical exposure or radiation or infectious virus came within a few feet of the shark embryos, yet the mutations nevertheless took place.

This shows us what a delicate piece of work Nature is and how human intervention only causes harm. Everything is fine-tuned and when human beings interfere, there is havoc.

The malformations of sharks in the wild are due to different reasons though. Everything from viral agents to metabolic defects and pollutants may be to blame.

Also a lessening gene pool due to overfishing may be responsible for inbreeding. This leads to genetic anomalies. Two-headed sharks remain a subject that has fascinated scientists and it will continue to remain a mind-boggling natural fact for researchers.

Overfishing is the most likely cause behind this abnormality of sorts. Other weird things such as a one-eyed cyclops shark have also turned up. The fisheries will have to cut down on their activities since overfishing will lead to diseases in the species of marine wildlife.

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<a href="/latest_stories/all/all/20" rel="author">Sumayah Aamir</a>
Sumayah Aamir (Google+) has deep experience in analyzing the latest trends.




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