It could be because it is the breeding season of the Nomura’s jellyfish which reside primarily in the waters between China and Japan, primarily centralized in the Yellow Sea and East China Sea. The mating and migration habits of this animal are not clearly understood, but their population is on the rise in the fishing waters and is a serious problem to the fishermen. In some areas the density is reported to be hundred times more than normal.
There are many theories that is said to be the cause of this explosion. One is global warming where the seas have been warmed and are better suited for their breeding. And scientists blame the over-fishing of the natural predators of the Jellyfish and the pollution along the coast. The high levels of nutrients in the water are also linked to this sudden jellyfish bloom.
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