Conditions for raising shrimp:
1. It is very important to choose the location for shrimp breeding. It is necessary to choose a center with rich water resources and good drainage and irrigation. It is possible to build a pond in this center or use rice fields to raise shrimp. Shrimps are omnivorous animals that are not picky at all. Common meat feed such as snails, leftovers of livestock and poultry, green feed such as vegetables, land grass, and refined feed such as corn, wheat, and grain should be cleaned up in time.
2. The PH value of the water in the shrimp pond must be between 7.8-8.6, not higher than 9.1, and new water sources should be injected frequently. The transparency of the water in the shrimp pond should be around 30-40 cm, and the quicklime solution should be sprinkled in the pond regularly to stop the conditioning of the water quality and avoid the outbreak of disease.
3. In the process of shrimp culture, if the temperature is suitable and the feed is sufficient, the young shrimp will grow to the standard of commodity sale in 60-90 days. Basically, the prawns will be released in March, and the fishing will be stopped around June.
How deep is the water demand for shrimp farming:
1. Under normal conditions, the suitable depth of shrimp water is 0.9-1.5m, the suitable growth ph range of shrimp is 7.7-8.8, the suitable hardness of shrimp water is more than 250mg/L, and the suitable total alkalinity is more than 80. If it is lower than 80 or higher than 400, certain protective measures should be taken.
2. In the process of shrimp culture, it will float out of the water to seek food. If the water is too deep, it is not conducive to shrimp seeking food, and the growth of shrimp is also unfavorable. Therefore, in the process of shrimp culture, it is necessary to control the water quality and water level, which must be conducive to the growth of shrimp.
3. In the consumption of shrimp farming, the quality of the fertilizer water is generally weighed by the color, transparency and freshness of the pond water. The fertilizer water is also affected by environmental factors and nutrient elements. If the fertilizer water becomes particularly bad, corresponding measures must be taken to protect it. Add a proper amount of complex vitamins to supplement a variety of nutrients and promote growth.
Why do shrimp need a lot of vitamins?
Shrimps are temperature-changing animals, which will change according to the change of ambient temperature. This characteristic makes shrimp unable to synthesize vitamins in the body, often resulting in insufficient vitamin content in shrimp. Therefore, vitamin supplementation for shrimp is considered to be a necessary condition for supporting shrimp growth, enhancing immunity and disease resistance.
Multivitamins play an important role in the nutrition of aquatic animals. Compared with protein, lipids and carbohydrates, vitamins only account for a small part of the feed (1-2%). However, vitamins play a decisive role in the metabolism of aquatic animals. The cost of vitamins may be higher, up to 15% of the feed cost. Aquatic animals have no or very low ability to synthesize vitamins to meet their own needs, so it is very important to provide vitamins to feed aquatic animals.
Adding fish and shrimp life liquid to feed can improve shrimp's strong resistance to stress and rapid penetration.
The main functions of vitamins for aquatic animals are as follows:
1. Vitamin A
Function:
(1) Promote the synthesis of mucopolysaccharide, maintain the integrity and normal permeability of cell membrane and epithelial tissue.
(2) It participates in the formation of photosensitive substances (rhodopsin) in visual cells and plays an important role in maintaining the photoreceptivity of the retina.
Deficiency:
(1) Slow growth, increased mortality, accompanied by intra-abdominal edema, decreased epidermal pigment, hypertrophy, swelling, deformity, edema of eyeball, displacement of eyeball lens, retinal degeneration;
(2) The growth inhibition of gill cap, melanosis, anemia, eye and liver bleeding, and high mortality of fish appear after 20 days of vitamin A deficiency.
2. Vitamins
Function: promote intestinal calcium and phosphorus absorption, improve immune function, calcium and phosphorus metabolism process formed by bone, and promote intestinal absorption of calcium and phosphorus.
Deficiency: long-term lack of vitamin D can hinder the absorption and metabolism of calcium and phosphorus, cause incomplete bone calcification, and affect the shelling of shrimp.
3. Liver damage caused by vitamin E deficiency
Function:
(1) Promote the growth of aquatic animals. Adding high level of VE in the feed is conducive to improving the efficiency and growth rate of fish feed;
(2) Improving the reproductive performance of aquatic animals is conducive to promoting the gonadal development of aquatic animals;
(3) Improve the immune ability of aquatic animals. Many studies have proved that VE can affect the immune system function;
(4) It can protect the erythrocyte membrane and increase its resistance to hemolytic substances;
(5) Improving the meat quality of aquatic animals can increase the stability and prolong the preservation of meat.
In order to effectively supplement the complex vitamins of aquatic animals, it is necessary to use the right amount of vitamins at the right growth stage, the right feed and the right purpose. Some researchers have studied the vitamin requirements of aquatic animals and proposed the appropriate levels for some aquatic animals.
The results showed that nutritional multivitamins can effectively play the role of antioxidants by regulating osmotic balance and resistance to salinity changes. When cultivating Penaeus vannamei, adding this ascorbic acid to the feed can promote the growth rate of shrimp and improve the survival rate of shrimp.
Adding fish and shrimp life liquid to feed to improve a variety of vitamins can improve the survival rate and growth rate of shrimp, and improve food digestibility and antioxidant capacity.
[Use time]
1. When aquatic animals are stressed, it is used to quickly restore the balance of the body;
2. In case of disease, it is used for auxiliary treatment to promote the recovery of the body;
3. If the liver is damaged or the body is poisoned, use it continuously for 5 days;
4. When nutrition is deficient or unbalanced, vitamin nutrition can be supplemented.
