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31Jan
Disease

Get to Know Vibrio Bacteria in Vaname Shrimp As the Cause of Various Diseases

The attack of vibrio bacteria in vannamei shrimp is one of the obstacles that you might face when carrying out vannamei shrimp farming activities. Vibriosis is a disease caused by the bacterium Vibrio sp. and can cause death up to 100% in the larval or juvenile stages.

Several types of vibrio bacteria often found in shrimp ponds include Vibrio harveyi, Vibrio parahaemolyticus, Vibrio alginoslyticus, Vibrio anguillarum, Vibrio vulnificus, and Vibrio splendidus.

Therefore farmers need to detect the presence of this bacteria as early as possible. This is done to minimize the risks that the farmers may face.

Also Read: What is Covert Mortality Nodavirus (CMNV) which Can Attack Vannamei Shrimp?

What is Vibrio in Vannamei Shrimp?

Vibriosis is a disease caused by an attack of vibrio bacteria in vannamei shrimp. In addition to vibriosis, the bacterium Vibrio sp. can also cause Acute Hepatopancreatic Necrosis Disease (AHPND) and White Feces Disease (WFD).

Several types of vibrio bacteria often found in shrimp ponds include Vibrio harveyi, Vibrio parahaemolyticus, Vibrio alginoslyticus, Vibrio anguillarum, Vibrio vulnificus, and Vibrio splendidus.

Also Read: Get to Know Myo IMNV Disease in Vannamei Shrimp and Its Characteristics

Contamination and Spread of Vibrio Bacteria in Vannamei Shrimp Ponds

As one of the fisheries commodities whose production continues to increase yearly, vannamei shrimp are economically able to contribute up to 33.1% in export value.

What’s more, with an intensive cultivation system, the productivity of shrimp ponds can experience a significant increase. But on the other hand, intensive cultivation systems can cause a decrease in water quality which can cause disease attacks, one of which is vibriosis.

The presence of Vibrio sp bacteria in waters is usually affected by poor physical and chemical parameters. Starting from the high pond water temperature, there is too much organic waste sediment deposition to the water salinity that is too high.

However, the contamination and development of vibrio bacteria in vannamei shrimp can be reduced in several ways, such as by using chemicals according to standards to kill bacteria.

Also Read: Recognize 7 Characteristics of AHPND Disease in Vannamei Shrimp Before It’s Too Late

Sustainable Vannamei Shrimp Cultivation with DELOS!

When carrying out aquaculture cultivation, it is essential to realize that bacteria are everywhere, including Vibrio bacteria in vannamei shrimp. Because basically, there are types of bacteria that are important for ecological stability and ecosystem sustainability.

However, some bacteria have a negative impact where their presence can trigger stress on the shrimp to diseases that cause mass death. Therefore, farmers need to manage their shrimp ponds properly and sustainably.

If you want to realize proper and sustainable pond management, DELOS can be your right partner choice. DELOS is the best science, technology, and operational management-based aqua-tech company that can help you explore new opportunities in the aquaculture field.

To start partnering with DELOS, contact contact@delosaqua.com or submit via the contact column on our website www.delosaqua.com. Trust your shrimp pond management to DELOS!

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29Nov
Disease

Get to Know the Covert Mortality Nodavirus (CMNV) which Can Attack Vannamei Shrimp

Covert Mortality Nodavirus

Covert Mortality Nodavirus or CMNV, is a pathogen in vannamei shrimp that causes VCMD or Viral Covert Mortality Disease. This disease causes shrimp to die at the bottom of the pond, which makes it difficult for farmers to detect them from the start.

The CMNV virus in shrimp was first discovered in China in 2009 with a mortality rate of up to 80%, causing huge economic losses for the farmers there.

However, it is also possible that this vannamei shrimp disease will spread to Indonesia if it is not prevented and handled properly. Therefore, in this article, let’s learn more about the Covert Mortality Nodavirus (CMNV)!

Also Read: Get to Know Vannamei Shrimp Probiotics and Its Benefit

Life Stadia of Shrimp that are Vulnerable to CMNV

In white shrimp, mortality due to Covert Mortality Nodavirus (CMNV) was found in the first month after stocking up to 60-80 days after stocking. However, shrimp from various stages are also potentially infected with this virus.

Therefore, farmers need to detect early on the presence of the virus that causes Viral Covert Mortality Disease.

Vertical transmission of this disease can also occur. In previous studies, it was known that wild shrimp E. Carinicauda was strongly suspected of being an intermediary for CMNV to spread to ponds.

Meanwhile, a study by Liu (2018) showed that Covert Mortality Nodavirus (CMNV) could be detected in oogonia, oocytes, spermatocytes, fertilized eggs, and nauplii.

Symptoms of CMNV Affected Shrimp

Shrimp waning due to Covert Mortality Nodavirus (CMNV) usually stays at the bottom of ponds rather than swimming on the surface. Over time, these shrimp will die. Therefore, CMNV disease is also referred to as “bottom death”.

While clinically, several symptoms are shown, including necrosis and atrophy of the hepatopancreas, empty stomach and intestines, softening of the outer shell of the shrimp, slowing growth, white muscles, and experiencing necrosis.

Also Read: This is the Process of Molting in Shrimp and How to Handle It

CMNV Diagnostic Methods

Covert Mortality Modavirus
Source: Zhang, et. al. (2018)

Diagnosing shrimp infected with Covert Mortality Nodavirus (CMNV) can be done using various methods, including Reverse Transcription Loop-mediated Isothermal Amplification (RT-LAMP), Nested Reverse Transcription PCR, gene sequencing, histopathology, RNA in-situ hybridization (ISH). Meanwhile, virus particles can be observed with Transmission Electron Microscopy (TEM).

How to Prevent CMNV in Vannamei Shrimp

As previously explained, the carrier part of the Covert Mortality Nodavirus (CMNV) comes from wild shrimp and other aquatic animals. Therefore, you must always be vigilant and monitor the possibility of this transmission.

In addition, considering that Covert Mortality Nodavirus (CMNV) can be detected early, make sure you cultivate shrimp fry that is healthy and free from various types of diseases.

Also Read: 7 Characteristics of High-Quality Vannamei Shrimp Seed

Find Out About CMNV and How to Handle It with DELOS!

Covert Mortality Nodavirus (CMNV) has a death rate of nearly 80% of the total shrimp population in ponds. Moreover, this disease is also not easily detected by the farmers considering that the infected shrimp will tend to stay at the bottom of the pond.

So it is very important to carry out routine checks and early detection of the CMNV virus that causes VCMD or Viral Covert Mortality Disease.

If you still need to figure out where to consult, DELOS is here and ready to help you. Together with a scientific team that has experienced for years and turns them off, DELOS is prepared to help you in handling if a disease is detected in your shrimp pond.

Immediately contact DELOS via contact@delosaqua.com or via the contact column on our website www.delosaqua.com to get a solution to your shrimp disease problem!

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