Nomura jellyfish has plagued the seas of Japan from 2005 up to the present. The unintentional attacks brought by this kind of creatures have severed the fishing industries of the affected regions in Japan as well as the balanced food chains in the seas.
The creature is even bigger than the diver himself.
Cnidocysts are considerably the identifying character of this creature. These sac-like structures contain toxins and enzymes that poison their prey. Once the prey is paralyzed, the dead creature is sucked towards the jellyfish’s stomach called manubrium. In this area, the jellyfish sucks the nutrients of its prey via two pressuring canals in the underside of the umbrella – radial canals, and the umbrella margin or lappet – ring canal. By nature, jellyfish are carnivores feeding only on small planktons and fishes, and sometimes even on their kind.
Nomura’s Jellyfish often disturbs the fishing industry by decreasing the number of small fishes, destroying the fishing nets and disrupting the natural food chain of the sea due to the over consumption of zooplanktons. Two several theories have been proposed explaining the rise of these sea monsters in the Japanese waters from 2005 up to present. First, the global warming is considered the principal cause of jellyfish migration from Chinese to Japanese waters. The temperature of the water makes Japanese seawater the ideal breeding place for their kind. Second, the amount of phosphorus and nitrogen in the Japanese seas are thought to increase the potency of the breeding process among these creatures.
Fortunately, jellyfish lacks sensory organs, such as brain and internal organs, but they do possess rhopalia, which acts as the perfect alternative for the sensory nerves. Rhopalia is capable of perceiving stimuli enabling them to catch their prey through waves of water, light disturbances and odor. Nevertheless, Nomura jellyfish maybe considered harmless to humans themselves, but their overpopulation in the seas of Japan can cause a great deal of trouble not only in the fishing industries and the entire sea bodies of Japan.