Jellyfish weigh anywhere from a few milligrams to more than 200 kilograms (440 pounds). The weight of a jellyfish is about the same as the weight of the water that its body displaces and depends on...
I found an article that states box jellyfish rarely live past a year in the wild and in that time can grow to 10 feet and to a weight of 4.4 pounds.
There are nineteen species of box jellyfish. Some...