World Largest Jellyfish, Monster Nomura’s Jellyfish, in Japan
January 19, 2006—Pitting two hands against thousands of stinging tentacles, a diver attaches a tracking device to a giant Nomura’s jellyfish off the coast of Japan on October 4, 2005.
Since last summer, Japanese waters have been inundated with the massive sea creatures, which can grow 6.5 feet (2 meters) wide and weigh up to 450 pounds (220 kilograms).
Though the jellyfish are more common in Chinese and Korean waters, their numbers have grown a hundredfold in some areas off Japan, causing a crisis in the local fishing industry.
Source: National Geographic
Wow, that’s a giant medusas. Sumo sized!!! Big enough to engulf a human being if not careful… My gosh. 
I wonder how old these giant jellyfish are. What’s the typical lifespan of jellyfish, anyway? 
How about the world smallest fish? That will be Stout infantfish! Discovered on January 26, 2006. 
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Gid said,
July 10, 2006
According to all other sources, the Lion’s Mane Jellyfish is the world’s largest, at 2.4 meters, or 8 feet, across.
Mariah said,
October 26, 2006
I know the lifespan of a jellyfish is 3to6months ,but how did it grow so fast?Thats the biggest one I have ever seen.
keith borden said,
November 8, 2006
that is a big jelly fish i was doing a report about jellyfish and i was scrolling down and their it was that big jellyfish and that is the biggest jelly fish in the world right? if not where is the biggest jellyfish at?
cary crooms said,
November 8, 2006
WOW!!!! that is a big jellyfish. It is rilly big .I wish i had a jellyfish
jizzy said,
April 22, 2007
wtf i’m never going in the ocean again.
cmac said,
April 30, 2007
yo what in the world is that big ass jelly fish doing on earth
LIZZIE LARS said,
October 7, 2007
YOU ROCK JELLY FISH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
dylan said,
January 2, 2008
i love jellyfish i think they are so cool
randy said,
January 15, 2008
thats one big jelly fish biger than i am right now
libby said,
January 28, 2008
HOLY CRAP
That THING is HUGE!!!
andie said,
May 3, 2008