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Showing posts from October, 2025

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Infectious Spleen and Kidney Necrosis Virus in Asian seabass

Posted by P.Dhivagar on October 13, 2025

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About EHP in your shrimp pond1
aflatoxin effects on fish.. toxins. mycotoxin..1
AHPND in shrimp. Binary toxins.Molting shells.P.vannamei1
alkalinity and shrimp1
alkalinity plays major role in nitrification process. nitrification. heterotrophic bacteria.1
ammonia control in shrimp pond1
Antinutritional factors in plant based meal.1
Aqua feed formulation basics. important factors to be considered for diet formulation.1
aquaculture5
aquaculture.1

Aquaculture. copepods. Zooplanktons. probiotics.1
Asian seabass1
bacteria1
best blog1
Best natural feed supplement for vannamei. spirulina in aquaculture. how to give spirulina for vannamei. feed supplement of spirulina1
Better ingredients percent for mash feed preparation. aquaculture. consultancy.1
Biofilm formation in shrimp pond..1
Biofilm in aquaculture. shrimp farming.1
Bioremediation in shrimp pond1
Biosecurity in shrimp farming.1
BKC uses in Aquaculture. shrimp farming . aquaculture.1
Black gill disease.... fusarium species... fungus... vannamei..1
Bleaching in shrimp pond. aquaculture. shrimp farming. protein food.1
Calcium chloride uses in aquaculture. shrimp farming.1
Copper and shrimp relationship. how copper plays important role in growth and gonadal development of shrimp.1
Digestibility and absorption in vannamei.. gut health...1
disease diagnosis1
dissolved oxygen in water. why warm water holds less temperature than cold water. how temperature affects growth of aquatic organism.1
doubts regarding shrimp farming1
effect of bluegreen algae in shrimp pond.1
effect of Moulting. Importance of Moulting.1
effects of high temperature in shrimp pond.1
Effects of sound on growth of an organism. Relationship between sound and growth of vannamei.1
ETP pond in aquaculture. shrimp farming. fish farming. waste water management.1
Experiment on DO tablets1
Feed selection strategy for shrimp farming.1
Feeding frequencies for vannamei.... best feeding frequency for vannamei..#guthealth #feedperformance.1
Feeding strategies to the shrimp pond.1
fish farming1
Foam formation in aquaculture pond.... foam... water quality..1
functional feed supplements in shrimp farming. how to increase growth performance of shrimp farming.1
Gut microbiome of vannamei. use of specific strains of probiotics. gut probiotics.1
Happy1
high alkaline water. aquaculture1
how EHP occurs in shrimp pond1
how to control ammonia in shrimp pond.1
how to control and treatment for EHP.1
how to maintain diatoms in shrimp farming.1
how to overcome acid sulphate soils in aquaculture1
how to prepare fermentation juice in Aquaculture.1
How to prevent bluegreen algae in shrimp pond1
how to prevent white feces syndrome in shrimp pond1
how to select good PL for vannamei.1
how to use zeolite1
Importance of carotenoids in shrimp.1
importance of chelated minerals for vannamei. minerals requirements.1
Importance of fermentation on proliferation of probiotics. Beneficial bacteria for aquaculture1
importance of microorganisms in the shrimp pond ecosystem. shrimp. aquaculture.1
importance of oxygen in water. Testing the quality of DO tablets in shrimp pond.1
importance of seaweeds and shrimp in aquaculture. research on seaweeds and shrimp compounds.bioactive compounds in shrimp farming.1
Importance of selenium in shrimp farming1
Importance of temperature in shrimp pond. How to maintain shrimp pond1
importance of vitamin C. Immunostimulants uses in Aquaculture.1
Importance of yeast in shrimp farming. bioactive compounds by yeast.1
infections.1
intensification in aquaculture. salmon culture1
Loose shell syndrome.... periphyton based farming....1
minerals requirements in shrimp. penaeus vannamei minerals supplementation.1
Moulting and minerals relationship in shrimp farming. issues in moulting in shrimp farming.1
Nitrifiers activity in shrimp pond...1
online class on shrimp farming.1
online class on Water quality management.1
online class. shrimp farming.1
operational cost in shrimp farming. aquaculture. shrimp farming. farm outputs.1
parasitic disease in carps. fish lice. argulus.1
periphhton based shrimp farming. shrimp1
pH and Alkalinity in shrimp farming. Water quality series...1
Potassium in shrimp pond. Minerals in shrimp pond.1
prevention of white feces in vannamei. lysozyme importance in vannamei.1
Procedures for shifting of vannamei from nursery to growout..vannamei.. nursery pond management in shrimp..1
pyrite oxidation in acid sulphate soils.1
quorum sensing1
Raceway1
Reaction of Moulted shell in shrimp pond1
Reason for muscle coagulation in shrimp. programmed cell death in shrimp.1
Reason for the necrosis in vannamei.....1
Reduce operational cost in shrimp farming. tips to reduce farm operational cost in vannamei.1
relation in oxidative stress and growth.1
Relationship between organic matter and bacteria. floc formation in shrimp ponds.1
Role of microorganisms in shrimp pond system. aquaculture.1
route of infection1
Running mortality syndrome in shrimp pond.1
Seepage ponds in aquaculture. how to control seepage in ponds. pond liner.1
Shrimp disease1
shrimp farming1
Shrimp farming. Importance of nursery pond.1
site selection for vannamei farming. best site for vannamei farming.1
Soil organic carbon in Aquaculture...1
soil reactions1
stocking densities for carp at polyculture1
stress and disease in aquatic organism.1
technical support1
Telugu: Aquaculture contents3
Thai : Aquaculture contents4
Tilapia lake virus and its prevalence in aquaculture. what is TiLV INFECTION AND HOW IT IMPACTS ON TILAPIA.1
Triple salt.... disinfectant in aquaculture.. shrimp farming..1
use of aluminium phosphide on shrimp farming. reaction of aluminium phosphide.1
use of marine red yeast in shrimp farming. use of yeast in aquaculture.1
Use of sulfate polysaccharides on aquaculture. prevention of viral multiplication in aquaculture.1
Vibrio1
water colour in aquaculture ponds. shrimp farming. primary productivity.1
weekly technical presentation about shrimp farming.1
White feces syndrome in shrimp pond1
white feces syndrome in vannamei farming1
white muscle in shrimp. different reasons....1
white spot formation in vannamei... minerals deposit on the carapace of vannamei1
why shrimp molted in full moon and new moon..1
Working of Zeolite on ammonia absorption1
wssv1

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Better clarification about pH and Alkalinity in shrimp pond. Water quality series -3

Hello everyone: Most of us confused between pH and alkalinity in the pond ecosystem. If there is low concentration of pH and alkalinity means we can increase but if there is high pH and alkalinity means it is some difficult to reduce . pH and Alkalinity are related but different. pH and Alkalinity: If you have shrimp pond then you definitely know the variance of pH in the water. You want to know means , you can check 4 to 5 times in a day. you must saw the pH fluctuations. Yes, pH is very important factor determines the shrimp culture. based on the level of pH you can tell , what happening in your shrimp pond. Fluctuations of pH is mainly determined by amount of carbon dioxide in your pond water. Other factors like soil pH, soil deposits like calcium carbonate, planktons density also determines the changes of pH in your water. pH : I am also tell the same me...

How copepods develops in shrimp pond after applying fermented juice?

Hello everyone: Are you know which is shrimp favourite food in zooplanktons? Yes, it is copepods. Shrimp eats more copepods which is present in the pond. In last blog, I told about the reactions and preparation of fermented juice using organic substrates. It is the continuation of that blog. In this I will tell about how zooplanktons(especially copepods) developed after fermented juice application. Main purpose of fermented juice in shrimp pond: Increase the beneficial microbial colonies by fermentation and produce various substances which is beneficial for beneficial organism growth. After application, it will forms the microbial proteins in the water column. It serve as a natural food for shrimp at stocking time. Initially, we have to give some natural live feeds because it increases the strength and natural immune system of the Shrimp. So only we prepared for development of zooplanktons in the pon...

How temperature plays major role in shrimp farming.(Water quality series - 1)

Hello everyone: Today we will see the importance of temperature in shrimp culture. What are the problems will come due to the temperature variance in shrimp pond. Most of the persons who doing shrimp farm must know about the things what happened during temperature Change. Shrimp grows very fastly, but we can't culture throughout the year. Why? If you are doing intensive or super intensive system means no problem. But you are doing the culture of shrimp on outside means you have to fix the culture days based on climate change(keep in mind). Ok let's jump into topic. Temperature : Most of the farmers doing in outer earthern pond. So in these situations, temperature plays important role in growth of our shrimp. We all focus only on ammonia, nitrite, H2S, but indirectly temperature plays very crucial role. Heat is produced in water due to sunlight. Because ...

Different roles of microorganisms in shrimp pond ecosystem - part 2

Hello everyone: Last blog, we saw about the importance of photoautotrophs in shrimp pond. In this blog, we will see about chemoautotrophic bacteria. For publication requests, Kindly fill the form in link: Publication request form Chemosynthesis is a process in which microorganisms actively utilize inorganic chemicals such as H2s, Hydrogen, carbon monoxide, ammonia, methane, iron, Nitrite, nitrate to produce their food. These type of bacteria didn't utilize carbon as a major energy source. Important : Farmers pls be aware of using carbon source for every probiotics application. They actively works in both aerobic and anaerobic conditions. Sulfur bacteria which oxidize H2S to sulphur and sulphates. Most commonly involved species are Thiobacillus. Nitrogenous bacteria which are mainly involved in nitrification process. We all are knew about that. Ammonia - nitrite - nitrate Species involved in this pro...

Determines the water quality by it's colour.(water quality series - 2).

Hello everyone: Today we will see about the different water colours behind the pond production. We already see in detail about temperature in shrimp pond. Now various techniques developed for doing shrimp farming. Intensive and super intensive farming system does not depends on primary production. But.. in earthern pond, we partly depends on the primary productivity . In final production, we calculated FCR in the pond. At this calculation we can't note or mention, how much feed contributed by planktons. If you are preparing the pond, then do one thing( after water filling). * Take white bucket. * Fill the bucket with water. * Note the colour of your pond water, not during heavy sunlight. * Daily do this and see the difference in your pond productivity. The colour of your water is mainly due to the present of amount of total dissolved and total suspended solids present in your ...

Importance of potassium in low saline shrimp farming.

Hello everyone: Most of us doing shrimp farming in low saline water only... Right? P.vannamei has tolerance capacity for wide range of salinities. So it is easy for doing in low saline water. In my blog, I posted about advantages and disadvantages of culture in low saline water.. in this major disadvantage is deficient of mineral. . If one region have salinity of 5 ppt then other region also have the same salinity means , we can't able to tell, both of water have same ionic composition... It changes based on places, region..... Minerals : Some of major minerals are very important for the shrimp growth and survival. Ca, Mg, Na, k, Cl. On these important minerals, Most of us faces the potassium deficiency in water. Next Magnesium is deficient in most of the region... Based on ionic analysis of water, you have to add minerals to your water....

Important of azolla in aquaculture

Hlo everyone; I am P.Dhivagar completed Bachelor of fisheries science. Now I working as a Technical executive. Today I am going to share about important of azolla in aquaculture. For publication requests, Kindly fill the form in link: Publication request form Importance of azolla in aquaculture Biosecurity in shrimp farm Azolla : It is a floating aquatic weed having high amount of crude protein upto 25% in dry weight based on environment it may changes. It has special capacity of fixing atmospheric nitrogen with the help of blue green algae Anabena azollae. Due it's nutrient availability it is used as feed for fish, poultry, pigs and cattles. We can reduce the feed cost by using azolla as a supplement feed. 6 different species available around the world. In India Azolla pinnata is widely spreaded. Experiments : Different researches conducted on developing azolla meal as a substi...

Important role of aerobic, anaerobic bacteria and probiotics in shrimp culture.

Hello everyone: Today we will see the important role of bacteria to maintain ecological functions of pond and also important role of probiotics in Aquaculture especially in shrimp . Nowadays probiotics is an important thing which is very useful for the growth of the organism and also plays important role in the immune system . Shrimp is an crustacean which acquires Non specific immunity or innate immunity. It cannot produce antibodies against specific viral pathogens because of its nature of defence. Shrimp is also an ectothermic animal. So we must take care of our shrimp through entire days of culture. Most of the probiotics are not directly applied into the pond(based on companies it may differ). Before the application we have to activate the beneficial bacteria which is present as a probiotic. We can activate by fermentation , it may be aerobic or anaerobic fermentation based on microorganism. In this...

Why vitamin C is mainly used during the culture of shrimp?

Hello everyone: Today we will see the important antioxidant which is included with diets during the culture days.... Essential : Always keep this in mind... We are not culturing the shrimp in their natural environment. We are culturing in high stocking densities compares to its natural environment.... So the needs for essential nutrients also high... If your culture depends on the natural production means then no problem for high use of additive compounds to the culture.. most of us only depends on the artificial feeds. Make sure the feed we using must be in high quality. Many basic rules are their to check feed quality. I will post about how to check this quality by physically.. poor feed quality leads to lost of culture. Improper storage leads to rancidity, if you use that racid feed to your shrimp then it will damage the shrimp tissues... Be aware and careful of using and choosing feed.. Vitamin...

How zeolite works on ammonia absorption in shrimp pond?

Hello everyone: Everyone knows, In shrimp ponds, if ammonia increases then add zeolite to reduce ammonia. Everyone tells zeolite removes ammonia. But we must know the reaction for better clarification. Zeolite : We can tell it is the type of mineral which contains sodium, aluminium, silicate. It has special function called adsorption (உறிஞ்சுதல்). Zeolite have tetrahedral shape, it has a entry channels for adsorption. Zeolite can adsorbs 30% from their body weight. Imagine it can adsorbs how much? It is in powdered form. Zeolite have pores for absorbing gases. It is mainly works on cationic exchange . How it works? We don't directly apply zeolites granules to the water because if we applied directly means, there is chance for absorbing water and atmospheric air or other things through the pore size in zeolite in shrimp pond. So it make competition for absorbing ammonia. Our aim is for removing Ammonia. If we make some small balls or mixed the with sand and make balls i...

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P.Dhivagar: Ariyalur, Tamilnadu, India; BFSc/Aquaculture enthusiast / Award winner for aquaculture ideation challenge at world aquaculture society/ Aquaculture technical support provider.

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