logotype

logotype

November 2022
Home 2022 November
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!

Read More
17Nov
AquacultureTips

7 Characteristics of High-Quality Vannamei Shrimp Seed

Quality vannamei shrimp seed is the key to the success of the cultivation that you are doing. Therefore, choosing the right one with high quality is essential to get optimal results.

Several tests are performed to determine the quality of shrimp seed. Among them are PL quality, origin and reputation of the hatchery, visual and stress evaluation, and other tests to detect if pathogens are present.

Therefore, here are the characteristics of high-quality vannamei shrimp seed that you should know to make the right choice.

Also Read: 5 Types of Shrimp Pond Aerators and Their Functions

1. Uniform Shrimp Seed Size

The first characteristic of high-quality vannamei shrimp seed can be seen from the uniform sizes of the shrimp seed. This non-uniform size indicates that the shrimp seed grows normally and receives the same nutritional intake.

In addition, the uniform size of shrimp seeds can also prevent cannibalism and competition for food with each other.

2. Shrimp Seed Not Physically Disabled

Several essential criteria must be filled in by high-quality vannamei shrimp seed before stocking. One of them is the physical equipment of the shrimp seed itself.

Healthy vannamei shrimp seed must have complete and well-developed limbs. From the tail that is not curved, the eyes and eye stalks are perfectly shaped, to the utterly intact swimming legs.

3. Shrimp Seed Has Fully Filled Gut

The external physical condition of the vannamei shrimp seed should also be examined for the state of the inside of the body, namely the gut. A vannamei shrimp seed is healthy when it has a filled intestine which is a sign that it is eating well.

On the other hand, vannamei shrimp seed with an empty gut condition can mean that the shrimp seed has no appetite or is even experiencing stress.

4. Right Move Actively

The next characteristic of high-quality shrimp seeds is shrimp seeds move by actively swimming here and there, which is done by activity testing. This is because the shrimp seeds are sensitive to external stimuli.

Also Read: 7 Easy Ways to Cultivate Vannamei Shrimp For Beginners

5. Free from Various Diseases

The shrimp farming industry has been affected several times by outbreaks of diseases caused by viruses and bacteria. Therefore, it is crucial to know whether you have certain conditions. This is done to prevent the farmers from losses.

Usually, a Polymerase Chain Reaction (PCR) test is carried out through a strict population sampling protocol to determine whether it is genuinely disease-free.

6. Pass the Stress Test

Minimizing stress on vannamei shrimp seed is a top priority during the hatchery process. From the time at the hatchery, the trip to the pond, until the stocking time.

This is because stressed shrimp seeds, when released into the environment to enlarge, will be potentially hostile to each other and less likely to survive.

7. It comes from a Trusted Hatchery

Finally, to get vannamei shrimp seed of the highest quality, you can get them from a trusted hatchery or hatchery. With a well-monitored hatchery process, farmers don’t have to worry about the quality of the shrimp fry they buy.

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

Get Quality and Reliable Vannamei Shrimp Seed at DELOS AquaLink!

The key to success in shrimp farming is the quality of what is cultivated. Therefore, when choosing goods, pay attention to the seven things above before deciding to buy.

If you’re looking for high-quality vannamei shrimp seed at competitive prices, you can get them at DELOS AquaLink!

Delos AquaLink is an integrated supply chain that connects our partners to get their pond product needs at the best quality and price. Through AquaLink, you can get your needs for pond equipment, feed, medicine, logistics, and harvesting services.

To become part of AquaLink, contact DELOS directly via contact@delosaqua.com or submit via the contact column on our website www.delosaqua.com. Let’s partner with us!

Read More
04Nov
AquacultureNews

DELOS Launches AquaHero App to Help Farmers Increase Shrimp Productivity in Indonesia

DELOS officially launched the AquaHero application in Jakarta on November 4, 2022. This application was developed to assist and help increase the productivity of shrimp farms in Indonesia. In addition, AquaHero also offers easy monitoring of the overall condition of the farms based on uploaded and personalized data.

AquaHero has been in development for almost a year. Initially, the idea of making this application arose when he saw the condition of shrimp farms in Indonesia which were less productive and tended to lose money. The existing farmland is very potential.

For this reason, through the features developed in the AquaHero application, DELOS wants to help shrimp farmers to avoid losses and uncertainties from the condition of their farms. Now, farmers can enjoy its various features through the mobile app or the web.

Also Read: 7 Easy Ways to Cultivate Vannamei Shrimp For Beginner

What Are AquaHero Features?

1. Water Quality Index

The first feature of the AquaHero application is the Water Quality Index. This feature can input and process daily water quality data assessed and tested by the DELOS Science Team.

Considering that water is the most important component in a farm, through this Water Quality Index feature, farmers can find out if an anomaly occurs in their shrimp farms so that they can immediately take mitigation if needed.

2. Monitoring the Condition and Growth of Shrimp

AquaHero also has a feature to monitor the condition and growth of shrimp. This is aimed at helping the farmers get consideration in making decisions in effective and efficient farm management.

3. Recommendation Feature

In most cases of shrimp farming, farmers sometimes need to learn what actions they should take for their shrimp farms. Therefore, DELOS developed AquaHero, which can be used as a compass for farmers. Of course, this recommendation for action has been reviewed by a team of experts from DELOS.

4. Financial Monitoring

The last feature of AquaHero is the Farm Financial Monitoring feature. This feature estimates the Break Even Point (BEP) during the current cultivation cycle. In addition, this feature can also help farmers to make decisions from a financial perspective.

Also Read: 5 Things You Need to Do When Starting a Shrimp Farm Business

AquaHero Success Story

Before being officially launched, AquaHero was developed as a prototype that farms have used in the DELOS ecosystem. The existence of AquaHero also helps farmers to increase their shrimp cultivation yields by up to 300 percent.

DELOS CEO Guntur Mallarangeng said, “Our partner farms that have used AquaHero have increased their productivity by up to 17 percent. Even one farm has increased up to 300 percent from the previous harvest cycle.”

For sure, this is a positive trend for seafood production in Indonesia. Especially considering that Indonesia is a maritime country with the largest coastline in the world.

Choose AquaHero for Your Shrimp Farm Management!

In shrimp farming, many things are difficult to predict, especially regarding the condition and development of shrimp. Therefore, DELOS developed the AquaHero application to help farmers increase their cultivation yields and predict uncertainty in their ponds.

Using AquaHero, users can get a more accurate picture of making cultivation decisions while considering a financial perspective.

For those who want to use the AquaHero app for your shrimp farm, contact DELOS via contact@delosaqua.com or the contact column on our website www.delosaqua.com. So what are you waiting for? Contact DELOS now!

Read More