The weather changed in March, from horror to the vernal equinox, which was a period of experiencing low pressure, rainy weather, and alternating cold and warm. In the past few days, the temperature in the western and southern regions of the Middle East has dropped significantly, reaching a maximum of 15°C. In addition, a large amount of rainfall has occurred in southern China, causing windy winds in eastern China. This “cold spring†climate has a great impact on aquaculture, which is mainly reflected in the stress response (such as: abnormal oyster shell, incidence), water quality changes (such as: "algae", "water turbidity"), back to the bottom (such as : ammonia nitrogen, nitrite, etc. In order to help the fish, shrimp and crab through this difficult time, we have summarized the following effective countermeasures based on past experience.
The southern part of the fish has entered the fry cultivation stage such as California, Osmanthus fish, loach, Koi, etc., the end of the ice-free period in the north, whether the fish or wintering fish is weak, vulnerable to pathogenic bacteria. For this cooling, we must take preventive measures to reduce losses.
First, keep water quality stable - prevent "water change"
1. Timely replenish carbon sources and stabilize water bodies. Carbon is an important substance that maintains the algae and fungal flora of the water body, and it is also an important substance for maintaining the nutrient metabolism of cells. The timely addition of soluble and easy-to-use small-molecule carbon sources plays a significant role in purifying water quality and stabilizing water bodies. "Clear water security," "activation," "dynamic carbon" and other carbon-rich, easy to use, stable water effect.
2, the correct use of microbial agents. Microbial preparations can reduce ammonia, nitrite and other harmful substances; can decompose organic matter and promote algal reproduction; can speed up the purification of water, promote material circulation, and stabilize water quality. "Bacteria," "more baits," and "lisheng" are all beneficial microorganisms that have a positive effect on accelerating the circulation of materials and the flow of energy.
3, Diligent reform, use degradable bottom reform instead of adsorptive reform. "Fu Di An" is an oxidative bottom reformation, "Dijuan" and "Diptera Net" are surfactant-type reforms, and "bottom oxygen addition" is an oxygen-increasing and detoxification-type bottom reform that can reduce the harmful effects of ammonia nitrogen, nitrite, etc. Substances, except for bottom odor, insects, and insects, improve the redox potential of the sediment, and at the same time, they can detoxify, have a good sustained release, and have little irritation.
Second, increase oxygen, improve water oxidation capacity - anti-anoxia
1, increase oxygenation efforts. In particular, the oxygenation of the bottom layer, and the use of “bottom oxygen†in time, can also relieve the toxicity of the harmful substances on the bottom layer.
2, topical oxygen. Especially high-density culture ponds. If you use liquid oxygen booster "oxygen speed guarantee" instead of solid oxygenation agent such as sodium percarbonate, calcium peroxide, etc., increase the oxygen content.
Third, strengthen manual control to reduce the occurrence of diseases - correct disease prevention
1, control the material, timely material or stop material.
2. To improve the anti-stress ability and anti-hypoxia ability of aquatic animals by taking orally "Lido Semen", "LY-Life Factors", and "Nutrition Express Line".
3, correct diagnosis, rational use of drugs, reduce losses. Some fishes are infected with water mold after frostbite, and they must avoid the use of irritating “disinfectants†when handling them, and at the same time pay attention to improving water quality, increase oxygenation, and prevent bacterial infection.
Shrimp At present, shrimp farming in China is divided into three stages: early prawn prawn, second shed shrimp, and white pond larvae. The “cold spring†weather will affect the farming to varying degrees. It is recommended that everyone , According to the weather, do a good job of daily management: regular health, more oxygen, good material control. In addition, we must respond to weather changes and do preventive measures in a timely manner. The specific measures are as follows:
First, Wen Peng prawn, focus on prevention of hypoxia and anti-"back to the bottom" of the work ("Fu Dian", "bottom oxygen," "Oxygen speed protection").
Second, warm shed shrimp or just put seedlings: keep young, Qiao Wenshui, anti-stress ("benefit", "aquatic lure yeast").
Third, the white pond Fangmiao: has put seedlings to add energy, promote hard shell, anti-stress ("activation", "reactive calcium"), did not put seedlings ready to put seedling preparations, until the weather is stable and then put.
Crabs are now in the early stages of crab farming. The significant cooling has a great influence on the growth and survival rate of crab seedlings. It is recommended that you take the following countermeasures:
First, to ensure adequate dissolved oxygen, deepen the water level, fertilizer and water. Increase the water level of fertilizer and water to reduce the transparency, the change of the bottom temperature is small, reduce the impact of sudden cooling, the water temperature can be stable, and crab stress is small. At the same time, the fertilizer can improve the oxygen production capacity and self-purification ability of the water body, and improve the stability of the water body.
Second, diligence at the end, improve the redox potential of sediment. After the oxidant is changed to the bottom, the oxygen-depleting substance in the bottom sludge is reduced. After the low-temperature return to the bottom, the impact on the water quality is small and the oxygen deficiency is not easy.
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