Why CaO is added in water body before pisciculture?

1 Answer
Sep 9, 2017

Answer:

It neutralizes the water by increasing the pH of water(normally acidic)

Explanation:

{I suppose the topic should be biology.}
Liming helps prevent wide swings in pH. So, Liming may enhance the effect of fertilization. Liming also adds calcium and magnesium, which are important in animal physiology.
https://www2.ca.uky.edu/wkrec/limingpondsaquaculture.htm

Fluctuations in pH are the result of the interplay of photosynthesis and respiration. Nighttime respiration increases #CO_2 # concentrations, creating carbonic acid and causing pH to fall. During the day phytoplankton absorb #CO_2# for photosynthesis, causing pH to rise.
Large, daily changes in pH can stress aquatic animals . The desired alkalinity for many animals is 50 mg/L or higher. Liming to raise total alkalinity to the required or preferred ranges buffers the water and reduces swings in pH.

https://www2.ca.uky.edu/wkrec/limingpondsaquaculture.htm