This year due to more incidence of shrimp, some shrimp farmers in order to prevent the spread of shrimp disease, often closed the gate does not change the water, but the results backfired, shrimp still did not develop. In fact, adding and changing water is a necessary measure to improve the quality of the shrimp field and provide a good water quality environment for the shrimp.
Its significance lies in:
1. Maintain the effective volume of water in the shrimp field.
The growth of prawns requires a certain amount of water space. The water in the shrimp fields gradually decreases due to the effects of evaporation and infiltration. If the lost water is not supplemented, the living space of the shrimp is reduced, causing the shrimps to be crowded and the shrimps being crowded. Not only is it slow to grow, but it is also susceptible to disease and affects survival.
2, reduce the bait coefficient.
On the one hand, seawater is rich in small-sized food organisms that feed into shrimp fields as shrimp bait when they feed water, reducing the input of artificial baits and appropriately reducing the cost of cultivation. On the other hand, adding water can stimulate the molting of the shrimp, promote the growth of the shrimp, increase the conversion rate of the bait, and reduce the bait coefficient.
3, adjust the water quality
(1) Adjust the salinity and nutrient content of the shrimp pond water by adding water, control the density of monocytic algae, and adjust the transparency;
(2) The dissolved oxygen content of water in the shrimp field can be increased by changing the water;
(3) Changing the temperature in the high temperature period can play a cooling role;
(4) Stabilize the pH value of the water in the shrimp pond by adding water, and reduce the content of toxic substances such as hydrogen sulfide and ammonia nitrogen in the water, so as to provide a good living environment for the growth of the shrimp.
4, improve the bottom
In the middle and later stages of cultivation, as shrimp eats more, the metabolic waste discharged also increases. If these organic wastes are not discharged through water exchange, they accumulate in the bottom of the pond. These organic substances accumulated on the bottom of the pond oxidize and decompose and consume large amounts of water. Oxygen causes hypoxia in the water; on the other hand, it causes bacteria to cause the onset of shrimp. Therefore, in the middle and later stages of cultivation, it is necessary to frequently change the water in order to maintain a good bottom quality.
Since the role of changing the water is so great, how can we control the change of water?
1, see the water near the sea conditions are good, salinity, ammonia nitrogen, hydrogen sulfide, dissolved oxygen, COD and other hydration indicators are normal, and the pool of salinity difference is not often changed, and vice versa.
2, see pathogens in the water toxicants such as red tide organisms and bacteria and other pathogens than normal levels and viral disease during the prevalence of less change.
3, see shrimp pond water quality such as dissolved oxygen is less than 3 mg / liter; chemical oxygen demand is higher than 5 mg / liter; pH is less than 7 or higher than 9.6; ammonia nitrogen content is more than 0.3 mg / liter; hydrogen sulfide is more than 0.1 mg / l; excess phytoplankton in the pond, less than 30 cm in transparency or protozoa, zooplankton bloom, so that the transparency of the pool is greater than 70 cm.
4, see shrimp bottom sediment black and stink, caused by the role of anaerobic bacteria, methane, hydrogen sulfide and other harmful gases escape constantly changing.
5, look at the activities of shrimp and crabs and other biological activities shrimp food intake decreased, shrimp, crabs, etc. appear floating head or the occurrence of certain non-epidemic diseases often change.
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