My Deep-sea Fishery

Fang Youqun was taken aback when he heard that.

Chen Qingsheng also widened his eyes in surprise, "Fifty meters? Captain, are you joking?"

Xiang Yang shook his head and said truthfully, "I'm not joking. The longest tentacles of stinging jellyfish can indeed grow up to fifty meters."

In many people's minds, jellyfish are small, cute, but simple marine creatures with toxins.

But Xiang Yang, who is familiar with jellyfish, knows that jellyfish are far more terrifying than that.

Especially the giant Echizen jellyfish that have appeared in Dongyi waters in recent years.

Echizen jellyfish are more annoying and greedy than other jellyfish.

And Echizen jellyfish are very scary.

The largest Echizen jellyfish can grow up to two meters in diameter and weigh two hundred kilograms.

An adult Echizen jellyfish can eat all the plankton in a large swimming pool in one day. As long as the Echizen jellyfish appears, there is no place for fish to survive at all.

Thinking of this, Xiang Yang shook his head and said with emotion: "In the vast ocean, fish have always lived at the top of the food chain. Even when there were dinosaurs and straight-shelled nautiluses, fish dominated the ocean. Billion For tens of thousands of years, fish have never lost to any other marine life, but now because of the appearance of Echizen jellyfish, fish have lost to jellyfish.”

"There's no other way. The Echizen jellyfish are really scary." Xia Pengjie said.

In fact, Echizen jellyfish are also found in our territorial waters.

Echizen jellyfish are called sand jellyfish in our country, and they frequently appear in our waters.

Because Echizen jellyfish is too destructive to my country's fishery resources, the Academy of Sciences in my country has long regarded Echizen jellyfish as the main jellyfish sample to be studied and raised and observed.

Scientists have discovered after research that the polyps of Echizen jellyfish not only have the same amazing predation ability, but also have amazing reproductive ability.

Different jellyfish have different reproductive methods, and Echizen jellyfish can also reproduce with foot capsules.

When the polyps of Echizen jellyfish sink to the bottom of the sea, they can move on the appendages. As they move, they can leave some tissues, which the researchers call pods, and these pods can reproduce more polyps.

This self-replicating, asexual reproduction method is enough to allow the initial 100,000 fertilized eggs to eventually evolve into billions of polyps.

When the polyp grows further, stacks of small jellyfish will split out one by one, and the final number will reach tens of billions.

Echizen jellyfish have such abnormal reproductive methods, which must be an important reason for the outbreak of jellyfish in recent years.

But Xiang Yang feels that this is definitely not the main reason for the jellyfish outbreak.

Because although the Echizen jellyfish is a newly discovered jellyfish, it is not a new type of jellyfish. It has existed in the ocean for hundreds of millions of years.

If the jellyfish outbreak can be caused by strong reproduction alone, then this ocean has been dominated by jellyfish hundreds of millions of years ago.

Of course, not all jellyfish are as scary as the Echizen jellyfish.

Some jellyfish are tiny and amazing.

Xiang Yang had seen a jellyfish called the lighthouse jellyfish before.

Compared with the huge size of the Echizen jellyfish, the lighthouse jellyfish is very small, only about five millimeters in diameter.

The lighthouse jellyfish is very magical. It is a true long-lived creature. It is incredible that they can rejuvenate, become larvae, and then grow again.

Many scientists in the world are studying why the life of the lighthouse jellyfish can live forever.

Of course, compared with the illusory immortality of the lighthouse jellyfish, the first thing to do is to solve the harm that jellyfish brings to human beings.

After analysis, the scientists found that the polyps of jellyfish not only have a large number, but also have a characteristic, that is, dormancy.

When the external conditions are not suitable, the polyp can lie dormant on the seabed for decades, and will not start to move until the time is right.

According to this characteristic of polyps, Xiang Yang believes that the main reason for the jellyfish outbreak in recent years is the change of the environment.

The seawater temperature in my country's coastal waters is increasing year by year, and there are still some subtle changes that have lasted for many years.

From 1980 to the present, the average level of eutrophication in my country's coastal waters has tripled, and Xiang Yang thinks this is one of the main reasons for the jellyfish outbreak.

Over the past six decades, humans have taken billions of tons of fish from the oceans, all from wild animals, not farmed by humans.

At the same time, humans have discharged more than one billion tons of garbage into the ocean, causing great changes in the entire ocean.

The rapid development of human society produces a large amount of industrial and domestic waste, and sewage discharges lead to more and more excess nutrients in the ocean.

As a result, algal plants are flooded, and red tides and enteromorpha are popular.

As a result, the algae provided sufficient food for the plankton, and the plankton proliferated in large numbers, and the jellyfish that fed on the plankton began to run amok.

In the past, the marine food chain has always been a pyramid structure, from diatoms and single-celled plants at the bottom to large fish and marine mammals at the top, and this structure has been stable for hundreds of millions of years.

However, the outbreak of jellyfish populations caused them to plunder plankton, making fish lack food sources, and the marine food chain was broken.

Xiang Yang said: "No matter whether the outbreak of jellyfish is caused by global warming, overfishing or ocean eutrophication, I feel that human beings are ultimately responsible for the consequences of excessive demands on nature, so since I have encountered these stinging jellyfish, Then we have to catch some up anyway.”

"I support the captain's approach." Chen Qingsheng was the first to express his opinion.

"I support it too." Fang Youqun shouted.

Xiang Yang smiled slightly, "In this case, let's start salvaging. Remember, you must pay attention to your own safety. During the salvage process, you must wear protective clothing from the beginning to the end."

As he said that, Xiang Yang put on his helmet himself, took a rake, and went to the sea to net.

These stinging jellyfish are actually pretty easy to catch.

Their bodies are very soft, like plastic bags, and at least 90% of their bodies are water.

When you get close, use a long pole with a hook to fish it into the water. As long as the stinging jellyfish is caught by the hook, just hold the pole and pull it to the deck. It is absolutely impossible to run away.

There are a lot of stinging jellyfish in this water area, and all of them are fat and fleshy, which is the best among stinging jellyfish.

Soon, Xiang Yang waved the rake and fished out dozens of stinging jellyfish from the sea.

Because this work has no technical content and is due to physical work, Chen Qingsheng and others even caught more than Xiang Yang. Soon, several water tanks on the boat were filled with stinging jellyfish.