- Create and control water color in ponds helps develop micro-plankton, stability of water environment, and creates a favorable environment to limit shocks in shrimp and improve survival rate.
- The use of biological products from reputable companies with clear sources (such as TA-GOLD, Rhodo powder, Pro BCS, etc.), incubated with rice bran, molasses, soy flour, before being released in ponds can control water color.
- Combined with using lime Dolomite + CaCO3 with a dose of 20 kg/1000m3.
Note:
+ Do not use inorganic fertilizers to create color for the water.
+ Check and adjust water environmental factors in pond before stocking:
Table 4. Quality of water supplied to ponds and water in ponds.
No. |
Parameter |
Unit |
Allowed values |
1 |
Dissolved oxygen |
mg/l |
≥3,5 |
2 |
pH |
7÷9, with fluctuation during a day no more than 0,5 |
|
3 |
Salinity |
per mile |
5÷35 |
4 |
Alkalinity |
mg/l |
60÷180 |
5 |
Turbidity |
cm |
20÷50 |
6 |
NH3 |
mg/l |
<0,3 |
7 |
H2S |
mg/l |
<0,05 |
8 |
Temperature |
degree Celsius |
18÷33 |
Source: Temporary process for safe brackish-water shrimp farming in areas affected by diseases in Vietnam. According to The Official Dispatch No. 10/TCTS-NTTS. January 6th, 2015. Vietnamese Directorate of Fisheries.
Viet Linh 2015. Translated by Sonia Linh V.
