Shrimp pond – Location selection and how to construction

Choosing a pond construction site is a very important issue that has a great impact on the investment, construction and risk in the future.

1. Location

– The area is water-free, with an easily accessible drainage system, with saltwater source (if there is fresh water source).

– Have good grid power, good traffic and good security, near to the shrimp farming.

2. Terrain, geology

– Shrimp ponds should be built in high tide areas.

– Suitable soil for ponds is meat, clay or sand meat.

– pH in soil is not less than 5 is best.

– In the soil there are no heavy metals: Fe (iron), Zn (Zinc), Pb (lead).

3. Aquatic hydration factors of appropriate water

– the most suitable pH 7.5 ÷ 8.5

– salinity from 15 ÷ 25 Độ

– The alkalinity (CO32-, HCO3-) is preferably 80 ÷ 150 mg / l.

– NH3 <0.5mg / l

– H2S = 0

– Fe 2+ = 0.02 mg / l

4. Prepare ponds

– Ao before the shrimp should be cleaned, clean up the bottom mud, picking clean moss, clean grass litter around the pond.

– Get water to wash the residue left in the pond. Then drain and lime water.

– Liming according to the pH of the soil, can be applied in the dosage as follows:

THE COHERENCE OF CACO POWDER
(TON / HA) HIGH QUALITY
(TON / HA)
> 6 1-2 0.5-01
5-6 2-3 1-1.5
<3-5 3-5 1.5-2.5
Applying limestone spreading on the pond surface and the edge of the pond pond, then drying the pond bottom to 2-3 days for the cracking of the bird’s feet, for the area heavily contaminated with alum, Chemical and toxic waste is at the bottom of the pond.

– Take water into the pond through the culvert, then kill the trash fish as well as the protozoan by saponin, with the amount: 1kg / 60m3 water

– After killing the trash fish for 2 days, treat the water with bactericidal chemicals. Currently used the following chemicals: Iodine 1lit / 5000m3, chlorine: 25-30 gr / m3 …

Note: When using water treatment chemicals should be dissolved into water and spread evenly throughout the pond, when used should be combined with gas fans.

5. Causing water color

Effect of watercolor:

– To facilitate the development of phytoplankton, reduce the transparency of the water, reduce light, limit the development of bottom algae, reduce the fluctuation of water temperature, increase oxygen in pond water, PH stability.

– When ponds appear water color, natural food in ponds (a very important source of food for shrimp when released) also appears. As plankton grows, it will reduce harmful substances in the pond, not shock shrimp.

Water coloring method for ponds:

Use fertilizer to water the pond.

Inorganic fertilizers such as NPK + Urea, with dosage of 1-2kg / 1000m3 or DAP 1-2 kg / 1000m3 / day (dissolve in water and then pour into the pond) 3-4 days to Whenever the transparency is 30-40 cm, the stocking is carried out.

– Organic fertilizers such as dried chicken manure compost, dosage: 100-200kg / ha.

If water color is slow, use soybean meal and fishmeal to cook, let cool for 10 hours then spread all over pond, use 5kg fish meal + 5kg soybean meal / 1ha. Before stocking if pH <7.5 need to add Dolomite with 100kg / 1ha.

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