“97% water, or something…”

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435_MoonJellyfish

 

“Jellyfish are 97% water or something, so how much are they doing? Just give them another 3% and make them water. It’s more useful.” ― Karl Pilkington

https://www.goodreads.com Karl Pilkington producer, poet, podcaster, raconteur and author...

https://www.goodreads.com Karl Pilkington
producer, poet, podcaster, raconteur and author…

 

 

Right? Wrong.

Jellyfish in the wild provide food for sea turtles, fish and sea-birds. Jellyfish in captivity, particularly the moon jelly, offer an aesthetically unique (and uniquely challenging!) aquarium experience.

 

The moon jelly, with a Latin name as lovely as its ethereal form… Aurelia aurita, prefers ocean temperatures ranging between 48 to 66 degrees Fahrenheit. It’s hard to believe something so delicate looking makes its living as a carnivore, but moon jellies do prey on the larvae of shrimp, crabs and other forms of  plankton.

http://en.wikipedia.org/wiki/Aurelia_aurita#Feeding Their stinging tentacles are harmless to humans…

…but lethal to their tiny prey.

theartfulamoeba.com  by Jennifer Frazer - "These three cuties are all crab larvae — from left to right, the zoea larva of the spider crab Maja squinado, the angular crab Goneplax rhomboides."

theartfulamoeba.com
by Jennifer Frazer – “These three cuties are all crab larvae — from left to right, the zoea larva of the spider crab Maja squinado, the angular crab Goneplax rhomboides.”

Though their movements are mostly governed by the tides, they can launch themselves into a nutritious plankton cloud by pulsing their bell.
Intrigued? I am, by the creature itself,  not by the thought of ‘keeping’ them in an aquarium.
For me,  part of the wonder of this translucent lifeform is the backdrop of its vast and tumultuous natural home … and its staggering breadth of history. Did you know jelly fish have plied the earth’s oceans for 500 to 700 million years?

Credit: Fossil photo by B. Lieberman. Modern jellyfish photo by Dhugal Lindsay. Copyright JAMSTEC

Credit: Fossil photo by B. Lieberman. Modern jellyfish photo by Dhugal Lindsay. Copyright JAMSTEC

http://www.sciencedaily.com/releases/2007/10/071030211210.htm

It doesn’t seem right to sustain such an amazing creature in a tank, even if we think they don’t mind…

“They have no heart, no brain and function with a loose network of nerves located in their thin outer skin. An elementary nervous system, or nerve net, allows jellyfish to smell, detect light, and respond to other stimuli.”
Yet of course, as evidenced by the videos gracing this post, there are many people who do enjoy the challenge of creating a jellyfish habitat.
“You need a special, circular aquarium called a  Kreisel tank,” said the fish-specialist manning the salt-water aisle of my local big-box aquarium outfitter. “It creates the circular current jellyfish need to float through the aquarium, plus it protects them from getting sucked into the tank’s filtering system. Also, the tank itself is round or cylindrical. Jellies would get wedged in the corners of a square tank and die.”

gizmodiva.com

gizmodiva.com

He added, “They might die anyway. They’re definitely not for beginners. I only know of one customer who has ever tried keeping them and he’s on his third tank in three years. I’d say anyone who thinks they’re up to the challenge should do their research first.” A good place to start…

by Chad L. Widmer

by Chad L. Widmer

by Chad L. Widmer. You can read more about this specie’s aquarium needs at:

http://deepseanow.blogspot.com/2011/01/keeping-moon-jellyfish-in-aquarium.html And pick up some fun facts at: visit: http://www.orma.com/sea-life/jellyfish-facts/

Where you can learn, among other many interesting things: • Marine scientists no longer referred to these animals as jellyfish and instead use the term jelly. • In 1991, over 2000 moon jellies were sent into space on the space shuttle Columbia to study the effects of weightlessness on the development of jellies. • A group of jellies is called a smack, but also a swarm or a bloom.

ocean.nationalgeographic.com

ocean.nationalgeographic.com

Felicity

 

 

“When you move like a jellyfish rhythm don’t mean nothing. You go with the flow, you don’t stop. Move like a jellyfish, rhythm means nothing. You go with the flow you don’t stop.” ― Jack Johnson

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4 thoughts on ““97% water, or something…”

    • Thank you! That’s just how I feel as I watch them. There is something so lovely about them, and then to discover they are one of the oldest lifeforms on the planet… something so ethereal… wow. : )

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