Scientists have determined that sixgill sharks that live in the Atlantic Ocean are not the same species as the sixgills in the Pacific and Indian oceans.

Sixgill sharks are really hard to study because they live in very deep waters. The ones found in the Atlantic are much smaller than the ones that are in the Pacific and Indian oceans.

Toby Daly-Engel from the Florida Institute of Technology said:

“We showed that the sixgills in the Atlantic are actually very different from the ones in the Indian and Pacific Oceans on a molecular level, to the point where it is obvious that they’re a different species even though they look very similar to the naked eye. Because we now know there are two unique species, we have a sense of the overall variation in populations of sixgills. We understand that if we overfish one of them, they will not replenish from elsewhere in the world.”

For more info, check out the Florida Institute of Technology’s website.

(Photo credit: Ivy Baremore/MarAlliance)

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SOURCEFlorida Institute of Technology
John Liang
John Liang is the News Editor at He first got the diving bug while in High School in Cairo, Egypt, where he earned his PADI Open Water Diver certification in the Red Sea off the Sinai Peninsula. Since then, John has dived in a volcanic lake in Guatemala, among white-tipped sharks off the Pacific Coast of Costa Rica, and other places including a pool in Las Vegas helping to break the world record for the largest underwater press conference.


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