Growing up to 2 meters (6 feet 7 inches) in diameter and weighing up to 220 kilograms (ca. 450 pounds),  Nomura's Jellyfish reside primarily in the waters between China and Japan, primarily centralized in the Yellow Sea and East China Sea .
Nomura's Jellyfish (, echizen kurage, Nemopilema nomurai) is a very large Japanese jellyfish. It is in the same size class as the lion's mane jellyfish, the largest cnidarian in the world. The width of these jellyfish are slightly larger than the height of most full grown men.
In some places, jellyfish density is reported to be "one hundred times higher" than normal, seemingly without explanation.There was a previous spike in the population recorded in 1958 and in 1995.