Farming, mining, seafood processing

The necessity of some minerals essential for growth vannamei

Vannamei has several outstanding advantages such as: can feed with a high density of 60-150 / m2 or higher; so the output is very large shrimp, short culture period of about 3 months; investment cost but high production, the oxygen demand of high cards so to investment in equipment to ensure adequate oxygen supply. Shrimp farming is a new object should be limited to farmers farming techniques, disease-prone and can be spread on a large scale, raising trend spontaneous unplanned breeding areas, ... .Therefore shrimp fed a high-density, growth rate by shedding continuous demand for minerals is very high. If the pond has low salinity content of Ca, Mg, P, Na, ... shrimp in low water absorption of minerals is not enough to affect the slow growth makes large shrimp, peeled shrimp hard hard shell, causing the cloudiness body and curved body commonly found in shrimp farming process.

Cause shrimp perforated base and curved body:

Lack of essential minerals: Ca, Mg, P, Co, Mn, Na ...;

  Heat shock;

  Low oxygen levels in the pond;

  Opaque body disease: infections caused by viruses IMNV shrimp (Infectious myonecrosis virus).

The cloudiness body, curved body usually appear shrimp shrimp at 10 days of age until adulthood. Therefore, it is necessary to determine the exact cause of shrimp opaque body, curved body to take measures to prevent and treat accordingly.

For the case of shrimp body is curved, perforated base mineral deficiency: clinical daytime when lifting water from the pond to eat some of the strong jump and flip, then bends to touch the tail part carapace together according to the phenomenon of tissue that runs along the middle of the body becomes white shrimp. Use hand stretching itself out but still bent shrimp and death. It is the cloudiness body and curved body mineral deficiency.

The Fix:

Ensure adequate supply of oxygen to the shrimp;

Avoid heat shock shrimp;

Once you have pinpointed shrimp opaque body, curved body mineral deficiency, the farmers need additional doses of mineral powder 1 kg / m3 in 1000 to overcome this phenomenon.

Precautions:

Limit intake screening test at hot sun;

Fan adequate water supply of oxygen to the shrimp;

Additional mineral powder periodically: 5-7 days hooked 1kg / m3 in 1000 to less than 45 days old shrimp; 3 days turned 1 kg / 1000 m3 of water for shrimp over 45 days old. At the same time, combining mineral water mixed into regular food: 5 ml / 1 kg of feed (2 times / day).

Minerals used for aquatic animals often have two types:

Mineral Water is mixed solution of phosphate salts.

Mineral powder: usually mixed oxide compounds.

Minerals provide content Ca, Mg necessary for the growth and contraction of the muscles of animals, in addition to Mg also catalyze the phosphorylation of energy supply for aquatic animals. If the water content of Mg deficiency, shrimp prone opaque body and curved body, soft shells, this situation lasting impact on the growth and kill the shrimp.

The phenomenon lasted soft-shelled shrimp, shrimp molting difficult environmental factors outside the country, but due to lack of concentration of Ca, Mg, P in water. P concentration in water is very low; therefore be supplemented periodically to limit the hard shrimp molting. When you encounter this phenomenon, farmers need to cross the pond with mineral powder dosage 1 kg / m3 in 1000, combining mineral water mixing 10 ml / 1 kg of feed (2 times / day) will overcome the phenomenon.

During breeding, white shrimp around 30-65 days of age is the period of greatest growth, if slow growth shrimp proved concentrations of Ca, Mg deficiency in water, does not meet the needs of shrimp absorption , mineral water should be added to food by mixing 5ml dose / 1 kg food (2 times / day).

In summary, during the shrimp crop should provide sufficient minerals to limit the shrimp are opaque body, curved body, slow-growing ...

Wang Qing Yu, Department of Agriculture and Rural Development Lieu, 18/04/2013