Discussion created on 06/11/2019

Can EDTA reduce hardness of Vannamei culture pond

Can anyone help me know whether we can use EDTA to reduce the water hardness of shrimp culture pond?

Divakar
Student
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Andreas Laggis Andreas Laggis
Master's degree in Fisheries Science
June 17, 2019
It is hard to understand your question. EDTA is used to stabilise PH in larval culture of shrimps and thus maintain diatom blooms, but not for "hardness" of water in culture ponds (as far as I know, but I may be wrong). Please be more precise with your question.
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Divakar Divakar
Student
June 17, 2019

Andreas Laggis... Thanks for your valuable response. Here in India Vannamei farmers are believing that the EDTA is reducing water hardness, maybe due to its metal chelating property. According to my knowledge, metal chelating property is found at higher pH environment. Personally I have checked with lab results. Before and after EDTA application there is no change in the hardness of water.

But the farmers still believe that the application of EDTA, brings some changes in animal behaviour like... Reducing moulting stress and subsequently maintaining growth increment.

An additional information is they are using EDTA 5 kg on the moulting days... When the water hardness is more than 6500ppm.

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Ram mohan rao Ram mohan rao
M.Tech Biotechnology
June 18, 2019
EDTA is chelating agent it has heavy metal binding properties and able to detoxify the metal toxicity. Farmers believe that metals contribute to increasing the hardness instead of divalent cations.
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June 23, 2019
I have also applied EDTA for reduce hardness but cant able to get satisfactory reasult.
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Divakar Divakar
Student
June 24, 2019
sanjeeb kumar pradhan , thank you.

Hardness result will not change . . . Application of EDTA may act on shrimp . . Relieving from hard water stress for time being. This statement I am recording here because . . Some farmer using EDTA at moulting days, and see some positive results like moulting and recovery.

The mechanism I don't know. I have started this discussion to know more field results from various region , on EDTA application and positive outcomes. I won't prefer to use EDTA . . . now I may try it. . With various dosage to see the positive in using it.
Thank you
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June 24, 2019
Practically we are not using EDTA , we are doing
Organic culture, there is no requirement of EDTA, SANITIZERS
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June 24, 2019
Yes, some of our formers used EDTA at the time of moulting, hardness, they are got good results
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Divakar Divakar
Student
June 24, 2019
garuku govindarao . . Ya. . . scientifically high pH is required for EDTA reaction with solutes in water.

So aquaculture ponds usually having the between 7.8 - 8.2 at morning time.

I want to know that, is there any positive results based stories available in the field.

On
Using EDTA in the hard pond water, brings some positive signs
( elieving stress due to water hardness) in the shrimp behaviour.

Thanks for your inputs and interest.
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Trong Chu Trong Chu
Agriculturist
June 25, 2019

I think that in an alkaline environment, EDTA again forms a major complex with Ca2+ and Mg2+ to form CaMg EDTA to reduce water hardness, thanks.

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August 14, 2019

What is hardness? How can I understand that?

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August 14, 2019
Edta can help moulting of hard cell shrimp
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