By Sri S.Rajamaickam
Asst.Chief Technical officer,ICAR-CIBA
🌀•What is Importance & Role of pH (Potential of Hydrogen) in Aquaculture & How to reduce or increase it in Our Biofloc Water?
🌐pH – 7.4 to 8 ppm is for better growth. But pH 6.5 to 8.0 ppm is acceptable.
🟣•pH 7 ppm value is neutral. Less 7 is acidic and more 7 is basic or alkaline. It can measure from 1 value to 14 value.
🟣•pH 6 ppm is acidic 10 times of PH 7 value.
🟣•pH 5 ppm is acidic 100 times of PH 7 value.
🟣•pH 4 ppm is acidic 1000 times of PH 7 value.
🌐Same as also increase
the basic value.
🟣•pH 4 ppm is acidic death point.
🟣•pH 4 to 6.5 ppm slow growth.
🟣•pH 6.5 to 8.5 ppm right value for fish farming.
🟣•pH 8.5 to 10.5 slow growth
🟣•pH above 11 alkaline death point.
🌐•How to increase pH in Biofloc tank?
🌐Use Calcium carbonate (CaCO3)
🟣•But Why we need to use Calcium carbonate
(CaCO3)?
Reason –
🟣CaCO3 –
CaCO3 has more Stabality than Dolomite or etc.
So There will be no pH Fluctuation in the water. The stability of pH is very important.
🟣•If pH value is less than 7.4 ppm. Add 100gm CaCO3 first and after adding pH will be
In between 7.4 to 8.0 ppm then leave the water with minimum 2 hrs aeration.
If not reached 7.4 ppm or above again 100gm CaCO3 till pH rise upto 7.4 – 8 ppm
🌐• How to reduce pH of water?
🟣We can use White vinegar or Muriatic acid or Alum to reduce the pH.
There is no particular dosages to reduce pH
🟣•Shutten pH reducing is bad for fish also. We have to reduce the pH is slowly slowly.
🌀• The Most Important thing about pH
Why we control the pH or Effect of low & high pH🧐?
🟣•If pH is less then mucus will be produce more.
🟣•More mucus will chock the gills and fish will come in stress. Due to stress feed consumption will be less and finally fishes will be dead.
🟣•High pH will effect on eyes, skin and gills.
🟣• High pH will increase ammonia & NH4 will convert to NH3. Fishes will swimming abnormally will come in stress and finally will die…
Thanks & Regards.
