Dear Rajeeb K. Mohanty
in L.vannamei culture, after release post larvae not water exchange until 60 day and then water exchange carring out for %10 water volume daily.
for L.vannamei ponds, the best water depth is 120-150 cm.
The optimum water depth in outdoor cultures is 1 to 1.2 m in ponds. The percentage of water exchange depends of the culture system. The percentage of daily exchange usually used in a commercial farms of México are: semi-intensive 5-10 %; intensive 5-20% and biofloc 0.1 – 5%.
In Mexico they use larger ponds 5 to 10Ha each and shallower water. I have tried vannamei farming at various depths from 1m up to 4.5m. I would venture to say the deeper the better.
In Ecuador the depth of the ponds is around 1-1,5 meters for densities between 8 to 80.
The water exchange is lower than 10% in some farms with low densitties and around 20% in high densities, if you have good aereation systems and good water quality (bacterial use) can manage only 10% .
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