Ocean-science

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closely related to sharks but with long, flat bodies and wing-like pectoral fins, mobula rays are ideally suited to swooping through the water - here off the gulf of california - yet seem equally at home in the air, so much so that they have earned the name “flying rays”. mobula rays can reach heights of more than two metres, remaining airborne for several seconds. 

mobula rays are quite elusive and difficult to study, so biologists are not quite sure why they jump out of the water. theories vary from a means of communication, to a mating ritual (though both males and females jump), or as a way to shed themselves of parasites. they could also be jumping as a way of better corralling their pray, as seen with them swimming in a circular formation. 

what is known about mobula rays is that they reach sexual maturity late and their investment in their offspring is more akin to mammals than other fishes, usually producing just a single pup after long pregnancies, all of which makes them extremely vulnerable to commercial fishing, especially as a species that likes to come together in large groups.

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The Okeanos Explorer has discovered a very cute octopus at a depth of 4,290 metres.

This is the deepest an octopus of this particular sub order of octopus has ever been seen. 

The National Oceanic and Atmospheric Administration noted this is a completely unsubscribed species and perhaps not belonging to any specific genus. Highlighting how little we still know about the creatures in the depths of our oceans.

(Ocean Explorer)

washingtonpost.com
France becomes the first country to ban plastic plates and cutlery
The ban, to take effect in 2020, is part of a program aimed at making France a model for reducing environmental waste.

Another great step in the right direction to reduce single-use plastics and plastic pollution in the ocean!

11 Electrifying Facts about Jellyfish

Some are longer than a blue whale. Others are barely larger than a grain of sand. One species unleashes one of the most deadly venoms on Earth. Another holds a secret that’s behind some of the greatest breakthroughs in biology. In every way, jellyfish are fascinating creatures and today we’re celebrating them with 11 wild facts!

1. Jellyfish have inhabited the ocean for at least half a billion years, and they’re still flourishing even as the sea changes around them.

2. Jellyfish are soft-bodied sea creatures that aren’t really fish. They’re part of a diverse team of gelatinous zooplankton, zooplankton being animals that drift in the ocean.

3. A noted feature of jellyfish is a translucent bell made of a soft delicate material called mesoglea. Sandwiched between two layers of skin, the mesoglea is more than 95% water held together by protein fibers. The jellyfish can contract and relax their bells to propel themselves. They don’t have a brain or a spinal cord, but a neural net around the bell’s inner margin forms a rudimentary nervous system that can sense the ocean’s currents and the touch of other animals.

4. Jellyfish don’t have typical digestive systems, either. These gelatinous carnivores consume plankton and other small sea creatures through a hole in the underside of their bells.

5. The nutrients that jellyfish consume are absorbed by an inner layer of cells with waste excreted back through their mouths.

6. One species of jellyfish glows green when it’s agitated, mostly thanks to a biofluorescent compound called green fluorescent protein, or GFP. Scientists isolated the gene for GFP and figured out how to insert it into the DNA of other cells. There, it acts like a biochemical beacon, marking genetic modifications, or revealing the path of critical molecules. Scientists have used the glow of GFP to watch cancer cells proliferate, track the development of Alzheimer’s, and illuminate countless other biological processes. Developing the tools and techniques from GFP has netted three scientists a Nobel Prize in 2008, and another three in 2014.

7. The jellyfish’s sting, which helps it capture prey and defend itself, is its most infamous calling card. In the jelly’s epidermis, cells called nematocysts lie coiled like poisonous harpoons. When they’re triggered by contact, they shoot with an explosive force. It exerts over 550 times the pressure of Mike Tyson’s strongest punch to inject venom into the victim. 

8. The venom of one box jellyfish can kill a human in under five minutes, making it one of the most potent venoms of any animal in the world.

9. Jellyfish who may be the most successful organisms on Earth. There are more than 1,000 species of jellyfish, and many others that are often mistaken for them.

10. Ancient fossils prove that jellyfish have inhabited the seas for at least 500 million years, and maybe go back over 700 million. That’s longer than any other multi-organ animal. And as other marine animals are struggling to survive in warmer and more acidic oceans, the jellyfish are thriving, and perhaps getting even more numerous.

11. Some jellyfish can lay as many as 45,000 eggs in a single night. And there’s some jellyfish whose survival strategy almost sounds like science fiction. When the immortal jellyfish is sick, aging, or under stress, its struggling cells can change their identity. The tiny bell and tentacles deteriorate and turn into an immature polyp that spawns brand new clones of the parent.

From the TED-Ed Lesson Jellyfish predate dinosaurs. How have they survived so long? - David Gruber

Animation by Silvia Prietov

Watch on the-earth-story.com

Dawww

Happy pi day! 

Unlike us, echinoderms like sea urchins have what is known as radial symmetry – meaning they’re symmetrical around a center point, like a pie. These purple and red sea urchins were observed in Greater Farallones National Marine Sanctuary off the coast of California. 

(Photo: Steve Lonhart/NOAA)

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The Atolla jellyfish is a species of deep-sea crown jellyfish (Scyphozoa: Coronatae). Like many species of mid-water animals, it is deep red in color. This species is bioluminescent. When attacked, it will launch a series of flashes, whose function is to draw predators who will be more interested in the attacker than itself. This has earned the animal the nickname “alarm jellyfish”.

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Ocean plastic pollution is a massive environmental problem. Millions of tons of plastic waste enter the ocean every year, even plastic that goes in the trash can often ends up in the sea! Joe Hansons teaches us about the Great Pacific Garbage Patch and look at the dangers ocean plastic poses to ocean animals. Plus, a few tips for you to reduce your own plastic use!