A large number of Vibrio were found in the dead crab's body. Li Ji frowned: "The Vibrio in the pond of freshwater crab should mainly occur in the high temperature season. It's only mid-June now, so it's not?"

It was confirmed that it was Vibrio infection in the pond, and Ao Yuanzang was anxious. The bacteria were very powerful, with a severe disease, and the mortality rate could reach 30% to 50%. Moreover, the bacteria's bacterial flora are explosive, which means that crabs have been infected and died now, so it is estimated that a large number of crabs have been infected with bacteria underwater.

Seeing that Li Ji had determined the condition, his student raised the agar medium and asked, "Teacher, do you still need to do a bacterial culture test?"

Li Ji said cautiously: "Make one and provide two-way verification."

Vibrio infection occurs in summer crab farming, especially in recent years, due to the large market demand due to government support, river crab breeding has developed rapidly.

In order to pursue maximum benefits, river crabs have high stocking density, and farmers will use feeds with higher protein content in order to grow faster.

In this way, the crabs will not float up like fish after death, and will still hide at the bottom of the farm, causing the conditions of the breeding waters to deteriorate. In addition, the fed fresh fish and high-protein feed will easily deteriorate. The physical condition of the river crabs will decline after feeding, and once they cannot be eaten in time, they will quickly rot and contaminate the breeding waters.

In this way, when the high temperature season comes, Vibrio will reproduce in large quantities and infect river crabs, causing the occurrence and epidemic of Vibriovirus disease in river crabs.

But this is aimed at a breeding pond. If a water area as large as Ambergris Lake, there should not be a river crab infection. The water quality in the lake is definitely very good, and the breeding environment is also good. As the saying goes, "raising water for crabs." If the water in Ambergris Lake is good, then large-scale Vibrio infection should not occur.

He told Li Ji what he thought of, and Li Ji nodded and said, "You know a lot."

Ao Muyang smiled wryly and said, "You're still working, after all, I'm your closed disciple, Teacher Li."

Hearing this, Li Ji glared at him: "My closed disciple knows this little? To lose my face, it is not just two conditions: temperature and humus high protein water quality. If you look into the lake, are there any problems?"

Ao Muyang looked into the lake. The sun was shining brightly and the lake water was clear. Dozens of small boats slowly floated on the lake surface, and people cheered from time to time.

He thought about it and said, "No problem."

Li Ji said patiently: "You open your eyes and look carefully."

Lao Ao opened his eyes to the maximum, and the corners of his eyes were sore, but he still didn't see anything.

Li Ji was helpless: "I asked you to open your eyes wide to observe more and use your brain to observe. You actually opened your eyes wide. You, you...ah!"

Carelessly accepting disciples!

Old Ao really wanted to make progress, so he continued to look at the lake hard. In order to see far, he still tiptoed and stretched his neck. Ao Yuanzang followed him to see this. A row of cormorants stood on the boat by the lake, and they also posed in this position. Of course, they were not learning from two people, this was their waiting and watching nature.

Li Ji pointed to the lake and said, "Look down, why are you stretching your neck? What is there in the lake? Water plants, Yilezao."

Ao Muyang nodded and said, "Yes, there is Yilezao."

In his early years, Land Hu gave him a batch of elle algae. After he raised it in the backyard breeding pond, he found that it was very helpful to aquatic products. elle algae is the food for crabs. So when Ambergris began to raise crabs, he planted a lot of algae into the lake. It has been two years now and is growing very well.

Li Ji analyzed: "The water quality of Amberg Lake is clear, which is related to the high amount of algae, but too much algae is not a good thing, especially if the air is hot today, the algae will quickly rot and smelly after it dies, causing a large oxygen debt of the bottom mud. And you have to know that the bottom mud is not oxygenated all day in June and July, and shrimps and crabs climb grass and swim around the edges, which can easily lead to ammonia nitrogen and nitrite exceeding the standard in the mud at the bottom of the lake, and anaerobic bacteria breeding in large quantities, breeding of vibrio groups."

Indeed, Ao Muyang nodded. There are many algae and many fish, shrimp and crabs in Ambergris Lake. No one comes to fish on a large scale all year round. Only two activities, such as crab fishing in autumn and grass carp fishing in winter, will indeed put pressure on the lake's ecosystem.

Li Ji said again: "More than that, there are more tourists coming to the lake, and more garbage received in the lake. Although you arranged for people to traw the net to clean up the garbage, the cleanup is all solid garbage. The bacteria brought by the garbage have entered the lake and cannot be salvaged and eliminated. Perhaps this is the source of infection."

Ao Muyang nodded heavily and asked, "How to eliminate Vibrio?"

Li Jidao: "From the analysis of the causes of Vibrio, we can see that the biggest factor causing the outbreak of Vibrio is dissolved oxygen. The water body is too low and the oxygen bond is large. The harmful substances such as ammonia nitrogen, nitrite, and hydrogen sulfide cause stress in river crabs, which weakens their ability to resist the invasion of external adverse factors. In addition, under low oxygen conditions, aerobic microorganisms are inhibited, and anaerobic microorganisms rise, making it easy to form dominant species, thus reaching or even far exceeding their pathogenic threshold."

These words were very well said. Ao Yuanzang looked at Ao Muyang with a sexual look. Ao Muyang spread his hands and said, "Add oxygen to the bottom of the lake?"

Li Ji said: "This is a root treatment method, and there is also a method to treat symptoms. I will go back and ask my colleagues who specialize in crustaceanism and aquatic pathology."

Ao Muyang immediately bowed and said, "Teacher Li, please worry, I will prepare a glutinous feast for you when I look back!"

Li Ji smiled and said, "Don't look back. It's better to choose a day than to meet the day. Let's prepare tonight."

Ao Muyang:┓(`)┏

When he came to have supper, Li Ji also brought a solution to the Vibrio outbreak infection.

The first is to determine the bacterial infection area. According to his colleague's professional analysis, with the scale of Ambergris, it is not that there has been a Vibrio infection crisis in the entire lake, but that there is a problem at the bottom of a certain lake.

The reason why crabs die is because freshwater crabs have a sense of territory during the shell change season. They will not easily leave their territory, nor will they let other similar people enter their territory.

After determining this area, we have to take the second step, put oxygen generators and aerator into the waters, and organize people to clean up the lake bottom in the relevant waters, and take away residual bait and dirt, and remove rotten weeds at the bottom of the lake.

At the same time, we have to spread medicine to the bottom of the lake to kill bacteria. Now there are Vibrio anti-aging reagent effervescent tablets, which are scattered like bricks and thrown into the lake. There is no fluctuation in the bottom of the lake. The effervescent tablets can act on the problematic waters with confidence.

Li Ji also told him that there are still many waters with Vibrio infection outbreaks, mainly because of the drought this year. Except for a heavy rain in spring, no rain has fallen so far, and there is no new water source for ponds in the lake, so no oxygen is brought in.

Old Ao has no choice but to control the weather.

After hearing his answer, Li Ji sneered: "You are escaping and you didn't even think of a solution. You just said you had no choice!"

Ao Muyang thought about it and felt aroused, and said, "Then, come a Dragon King's rain-praying activity?"
Chapter completed!