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A sci-fi movie-like scene is playing out in the waters of Japan - swarms of giant pink jellyfish float on the surface of the sea, fishing boats struggle to navigate through the jellyfish "fog", and nuclear power plants not far away are also being "attacked" by jellyfish.
Behind this extraordinary scene is a seemingly absurd and extremely fierce "contest" between Japan and Chinese jellyfish.
These seemingly harmless "umbrella spirits" are Japan's nightmare.
Overcoming rigidity with softness, overturning a 10-ton fishing boat
As an island nation, Japan's territory consists mainly of islands surrounded by the ocean, so fishing can be said to be one of the lifeblood of Japan's economy.
For thousands of years, Japanese fishermen have relied on the abundant fishing resources of the surrounding offshore waters for their livelihoods.
However, in recent years, as the climate has warmed, Echizen jellyfish in China's coastal waters have begun to explode, and swarms of Echizen jellyfish are carried into Japan's offshore waters by ocean currents between May and October every year, which has a serious impact on Japanese fishery production.
During the months from May to October, when jellyfish are at their peak, the scene off Japan's coast becomes like something out of a science fiction movie: thousands of giant pink jellyfish float on the surface of the sea, densely clustered and occupy most of the sea.
When Japanese fishermen go out to sea, their boats need to swing left and right in this pink "jellyfish sea", sometimes even accidentally entering areas where jellyfish are dense.
"Our fishing boat is like sailing hard in a fog of jellyfish, and everywhere the sight can see, the hull is also surrounded by jellyfish, lapping, and the feeling of floating is very uncomfortable."
Taro Yamamoto, a 68-year-old Japanese fisherman, recounts that jellyfish have a natural "hatred" for fishing nets.
When the nets are put away, swarms of jellyfish will be trapped by the nets, and the strong pull will directly drag down the fishing nets carefully laid by the fishermen.
"Once we spent hours carefully laying our nets, and when we closed the nets, the hull was dragged backwards a few meters, and most of our nets were dragged down by jellyfish."
The damage caused by the giant jellyfish body to the fishing net is obvious.
According to the statistics report of the Japan Fisheries Agency, during the jellyfish active season, the marine catch of fishermen in some severely affected fishing ports tends to be more than 50% lower than normal, and the most direct impact is the reduction of income.
"My catch could sell for 5,000 yen this time last year, but this year I can only sell it for 2,000 yen, which is more than half." Yamamoto Taro said with a sigh.
To make matters worse, large numbers of jellyfish can directly lead to capsizing, as was the case in November 2009.
When a 10-ton fishing boat was operating in the eastern waters, it suddenly made a loud clicking sound, tilted its hull to one side, and then "boomed" loudly, and the fishing boat capsized.
"We were all scared and stupid, I instinctively grabbed the mast next to me to stabilize my body, and when I came back to my senses, the person was already in the water."
The fishermen who survived the crash recalled that the three fishermen who fell into the water were fortunately rescued in time, otherwise the consequences would be unimaginable.
Later investigation found that the cause of the capsizing of the fishing boat was the accidental capture of a large number of huge Echizen jellyfish, and the pull force they generated directly exceeded the carrying limit of the fishing boat.
This seemingly fragile sea creature has the "combat power" to make a 10-ton fishing boat capsize directly, which makes all fishermen who witnessed this scene sigh.
The damage caused by jellyfish to Japan's fisheries has long gone beyond simple economic losses and threatened the confidence and livelihoods of Japanese fishermen.
How to deal with the damage caused by jellyfish to the fishery has become a serious problem faced by Japanese fishermen.
Clogging subsea equipment and paralyzing nuclear power plant systems
Most of Japan's nuclear power plants are built in coastal areas, and they rely on seawater circulation for reactor cooling.
However, in recent years, jellyfish have frequently "attacked" the seawater inlet system of these nuclear power plants, severely blocking the seawater filter of the nuclear power plant, causing serious consequences.
In August 2006, there was a jellyfish attack on a nuclear power plant that caused a sensation in Japan.
On August 16, a nuclear power plant facility in northeastern Japan suddenly sounded an alarm indicating an abnormal flow rate in the seawater cooling system.
After the staff inspected, they found that a large number of Echizen jellyfish suddenly poured into the seawater inlet of the power station, blocking the key filter screen of the cooling water system.
"When we looked at the surveillance video, we were stunned, there were thousands of jellyfish floating densely at the inlet, and they kept pouring into the cooling water system as if they couldn't stop, and the flow of seawater was instantly reduced by 80%." The on-site staff recalled at the time.
In order to avoid overheating and outages at the nuclear power plant, the power station was forced to activate emergency measures, switch to a backup seawater pump and manually control the flow of seawater, but the seawater filter was still severely blocked.
In addition, the nuclear power plant also urgently sent divers into the water to manually clean the filter.
"The seawater filter was full of jellyfish debris and mucus, and the unpleasant smell was disgusting, and we had to carefully clean it slowly with special tools." The diver interviewed said.
During the high-risk operation of diving clearance, at least nine divers have reportedly died from jellyfish stings.
"Jellyfish have small stings, but they are very toxic."
Jellyfish silk can penetrate and touch the skin even when wearing thick wetsuits, a serious accident that forced the plant to shut down for up to a month, a staff member said.
In the eyes of the public, jellyfish easily broke through the defense line of nuclear power plants, which undoubtedly made the Japanese public doubt the safety protection ability of nuclear power plants.
For a time, the topic of "whether vulnerable jellyfish can threaten the safety of nuclear power plants" aroused heated discussions from all walks of life.
In addition to the economic losses, the incident has raised concerns among the Japanese public about the safety of government-regulated nuclear power plants.
Whether there are loopholes in the supervision of nuclear power plants and how to avoid similar incidents from happening again have become the focus of debate in Japanese society.
How strong are the seemingly fragile jellyfish?
The reason why a single jellyfish can cause great damage to developed Japan is the strong biological "combat power" of jellyfish.
Echizen jellyfish are large in size, with an umbrella-like body diameter of 2-3 meters, making it one of the largest jellyfish in the world.
These "giants of the sea" are astonishing in size and amazed many who meet them for the first time.
"When I first saw that jellyfish, I thought it was an alien visitor, and I couldn't believe that there were such huge creatures in the ocean." Japanese fisherman Taro Murakami said.
These huge jellyfish can weigh up to 220 kilograms each.
"I once saw a jellyfish that was salvaged, at least the size of a car, which was shocking."
It is conceivable that when hundreds of such huge jellyfish gather together at the same time, the destructive force produced by their combined force is unimaginable.
The 2009 accident in which a 10-ton fishing boat was capsized by a jellyfish was a testament to this.
In addition, jellyfish have a strong and rapid proliferation ability that is different from common organisms.
A mature Echizen jellyfish can lay billions of tiny jellyfish eggs at a time.
With superior water temperature and food conditions, these tiny jellyfish can grow into adult individuals in a very short time, completing their entire life cycle.
"We've seen interesting videos from cameras for a while that show the jellyfish going from tiny crystalline states, to tentacles growing and finally turning into pink giants, 'in the blink of an eye.'" The researcher at the University of Tokyo said.
This ability to reproduce rapidly at an almost "explosive" rate allows the number of jellyfish to grow exponentially in a short period of time.
When the environmental conditions are superior, the jellyfish will be like turning on the "crazy mode", rapidly multiplying and expanding the population size, which also explains the sharp increase in the number of jellyfish in recent years.
The Japanese also tried to confront this powerful foreign "invader".
At first, Japanese fishermen would use the simplest and crudest means of retaliation - chopping up the jellyfish they caught and throwing them back into the sea; But they soon discovered that this destructive approach not only did not help, but also stimulated jellyfish to accelerate their reproduction.
"We found that we chopped up the jellyfish and threw them into the sea, and the next day the number of jellyfish increased instead of decreasing." Japanese fishermen say that the original broken jellyfish will quickly discharge a large number of germ cells, allowing the jellyfish to reproduce at a faster rate.
Later, Japan also tried to drive out the power grid, but with little success.
All kinds of ineffective responses can only show that the subjective will against this biological weapon-level natural creature is doomed to failure.
The jellyfish's strong survivability is almost "invincible".
Climate warming, marine pollution and ecological imbalances caused by commercial fishing are all at the root of jellyfish infestation.
The complexity and severity of the jellyfish problem warns us that if human beings do not respect the laws of nature and fight only by subjective will, the problem will not only be difficult to solve, but may also turn itself into a party that creates disasters.
We must pay attention to the ecological environment and face this challenge with a benign interaction mentality.
In the face of unknown nature, we have infinite possibilities and many fragility.
Only humility and prudence can find the future path of human civilization in these two qualities.