The Nomura, found in the seas between China and Japan, is one of the largest jellyfish species and can reach up to 1.8 meters / 6 feet in diameter with an astonishing weight of over 180 kilograms / 400 pounds.
Nomura jellyfish can deliver a nasty venom that is difficult to treat because it is made of a particularly complex mix of protein toxins. Symptoms from a sting include swelling, itching, severe pain, inflammation, and in extreme cases, death.
However, it′s not only the dangerous venom that can make this jellyfish deadly. Blooms of the species can wipe out fish populations, particularly in areas where natural predators such as tuna, swordfish, and leatherback turtles are missing.