Skip to content
#Open journalism No news is bad news

Your contributions will help us continue to deliver the stories that are important to you

Support The Journal
A group of jellyfish float in a tank.
A group of jellyfish float in a tank.

Jellyfish are freaks of nature that could take over the world's oceans

They can thrive despite factors such as pollution or a lack of oxygen, and a lack of natural predators has led to a surge in their population.
Sep 14th 2013, 5:30 PM 12,704 42

JELLYFISH ARE TAKING over the world’s oceans, according to marine biologist Lisa-ann Gershwin, who describes their explosive growth in her new book “Stung! On Jellyfish Blooms and the Future of the Oceans“.

That’s because jellyfish are remarkably resilient. They are efficient breeders, “voracious feeders,” and require very little oxygen to survive, reports Tim Flannery in The New York Review of Books.

It’s no wonder these floating creatures have been around for more than 500 million years. Jellyfish are freaks of nature — they can thrive in ocean conditions that kill most other fish and sea animals.

Plastic bags and oil platforms aren’t a problem as jellyfish think these unnatural surfaces make great breeding grounds. Oxygen-depleted areas of the ocean, known as “dead zones“, also don’t seem to be a hazard to jellyfish.

In turn, a lack of natural predators has led to an upswing in jellyfish populations.

While “fish and prawn numbers plummeted” in the wake of Hurricane Katrina and the Deepwater Horizon oil spill, the Australian spotted jellyfish, which showed up in the Gulf of Mexico in 2000, strengthened in numbers, according to Flannery.

“As survivors of an earlier, less hospitable world, they can flourish where few other species can venture,” he writes. “Their low metabolic rate, and thus low oxygen requirement, allows them to thrive in waters that would suffocate other marine creatures. Some jellyfish can even absorb oxygen into their bells, allowing them to “dive” into oxygen-less waters like a diver with scuba gear and forage there for up to two hours”.

There is still some debate as to whether jellyfish may soon dominate the seas. The perception that jellyfish are becoming more common is based on “media fascination” and a lack information about their numbers in the past, according to a study published in the journal BioScience in February 2012.

- Dina Spector

Read: Deadly jellyfish-like ‘Man-of-war’ in Irish waters >

More: Diver stung in face by jellyfish in Skerries >

Send a tip to the author

Business Insider


This is YOUR comments community. Stay civil, stay constructive, stay on topic. Please familiarise yourself with our comments policy here before taking part.
write a comment

    Leave a comment

    cancel reply
    Back to top