The divers' figures moved in the beam of light, shuttling through the dark sea like ghosts, with only the indicator lights on their helmets flashing faintly.

After the last piece of protective net was spliced, the divers checked around the breeding circle again, confirming that all ropes were firmly fixed and the net was not damaged, and then they finally breathed a sigh of relief.

They retracted their robotic arms, swam slowly towards the submarine, and returned to the cabin one after another.

As the submarine's hatch slowly closed, it isolated the dead silence outside.

Lao Wang, the leader of the fish farming team, wiped the sweat from his forehead and excitedly announced to everyone, "Alright, the breeding enclosure is ready! Tomorrow, we'll put the fry in!"

As soon as he finished speaking, cheers rang out all around, and the exhausted divers also smiled with relief.

This artificially enclosed "sea" may be their future lifeline.

The next morning, the sun was shining brightly and the sky was cloudless.

The members of the fish farming team came to the deck early. They carefully took out more than 200 young fish that had been prepared in advance. These little lives were swaying their tails slightly in the clear sea water, full of vitality.

The quantity is small, but the variety is rich.

Lao Wang carefully checked each young fish to ensure that they were lively and healthy.

"All the juvenile fish have been checked and are ready to be released!" Lao Wang announced loudly, but he also reminded him worriedly: "Remember, be gentle and don't hurt them!"

The fish farming team members gently placed the young fish into the breeding pen.

The water ripples slightly, and the young fish swim in circles, like shining stars scattered in the deep blue ocean.

On the deck, other people also gathered together, all talking and laughing.

A week later, Lao Wang came to the breeding circle with great anticipation to observe the growth of the young fish.

However, a scene that shocked him appeared.

Many young fish were floating on the sea surface with their bellies turned upside down, already dead.

His expression suddenly changed.

"What's going on? Why are so many fish dying? I've checked the water quality and the equipment, and I don't find any problems!"

This matter concerns the food of all future survivors.

Scientific researchers arrived quickly and conducted a comprehensive test of the water quality in the breeding circle, including temperature, salinity, dissolved oxygen, ammonia nitrogen, nitrite and other indicators.

However, the test results showed that all indicators were within the normal range and no abnormalities were found.

This further exacerbated everyone's confusion and panic.

"How could this happen? All indicators are normal, but the fish died... Could it be some unknown virus or bacteria?"

After several days and nights of research, the researchers finally came up with a result.

It turned out that they found undigested artificial feed in the intestines of the dead fish, and there were no signs of pathogen infection in the liver and gills, but the fat content was far below normal levels.

Therefore, researchers believe that the problem lies in "eating". These young fish are not not full, but not eating the "right things".

There is no natural plankton in the sea now, and young fish lack special nutrients obtained from the bottom of the food chain. This is the death caused by "hidden hunger".

Captain Shang frowned as he listened: "What should we do then?"

In fact, the fish farming team had noticed this problem before, and they also added some nutrients and proteins necessary for fish to their bait.

However, that was done in a small breeding system within the mother ship.

There are not many fish, their swimming range is very small, and they do not need much feed.

But now that the young fish have been released into an area of ​​700 to 800 meters in the sea, the nutrition of the feed prepared before is obviously not enough.

Besides this, there is another reason.

The reserve fish on the mother ship have been living in cabins with no wind and waves, no natural enemies, and constant water flow for a long time. If they suddenly enter the breeding circle in the open sea, even if the water flow is gentle, they will have a strong stress response due to the sudden change in the environment. The young fish have weak resistance and are more likely to die from stress.

But there is no other way to do this except to let the young fish adapt slowly.

Captain Shang then ordered the fish farming team and scientific researchers to work together to quickly adjust the feeding methods and find ways to improve the breeding environment.

This is a death order.

No matter how difficult it is, we must overcome all difficulties and complete it.

So when the order was issued, the research team was divided into two teams.

A team rushed into the mothership's supply compartment, dug out all the stored algae powder and Artemia eggs, and set up a temporary feed mixing table in the laboratory.

They mixed chlorella extract and defatted fish meal in proportion and carefully added a small amount of vitamin B12 solution.

The previous feed was only enough to fill the fish, so now we have to "supplement" the nutrients in the natural bait. Start with a small amount of trial feeding and observe the feeding and activity of the young fish.

They worked through two consecutive nights and finally developed three types of fortified feed with different proportions. The next morning, they used a small boat to deliver them to the breeding pen and fed them to the surviving young fish.

One third of the 200 young fish originally released have died, and now only more than 100 are left.

Another team was busy renovating a cabin on the bottom floor of the mothership to build a "small bait cultivation system" here.

The team members brought in transparent acrylic culture pools, connected the circulating water pipes and temperature control equipment, poured filtered seawater into the first pool, scattered flat algae seeds, and then turned on the LED lights that simulated sunlight.

Phytoplankton are the foundation of all marine life, and they must first be allowed to grow explosively.

Then these algae are thrown into the ocean to simulate the environment of the original ocean.

Zhou Shuwan no longer needs to monitor the underwater situation, so he is relatively free.

So she has been following the research team. She wants to observe and learn more about how the research team will change fate and achieve freedom in fish farming under such an environment influenced by countless objective factors!

Maybe they are the first step in restoring the ocean’s ecosystem!

Three days later, the originally clear sea water turned a light green, and the pool was full of swimming flat algae.

Zhou Shuwan felt a little claustrophobic when watching this.

The team members then introduced the algae liquid into the culture pool next door and put in the cultured brine shrimp eggs.

In less than two days, densely packed Artemia larvae appeared in the pond. They moved around in the algae liquid, feeding and jumping around, which made the researchers present breathe a sigh of relief.

People like Zhou Shuwan who had no idea about it just felt their scalps tingling.

She even stood a little further away from the pool.

The researchers released these algae and insect eggs into the aquaculture area in batches.

In the breeding circle, the young fish are also gradually adapting to the new environment.

They seemed a little hesitant at first, swimming slowly and hiding in the corners of the breeding pen.

But as time went on, they gradually became active and began to swim in groups in the circle, competing for the feed put out by the researchers.

At first, the amount of feed added was very small, as the researchers were afraid that the young fish would eat too much and suffer from indigestion.

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