Teach you to cultivate crayfish professionally 5

Good morning, dear viewers. Let's continue with the content booked yesterday to write about the water quality control of shrimp ponds. Crayfish should always keep the pond water fresh throughout the culture process, with a transparency of 40-50 cm, a PH value of 7.5-8.5, and a dissolved oxygen content of more than 4 mg per liter. The water in the shrimp pond is changed every two weeks or so, within 1 / 3 of each time. It is shallow in spring, full in summer, diligent in autumn and deep in winter all the year round. Generally speaking, the pool water is controlled at 0.5-0.6 meters in May, 1.2 meters in August and 1 meter in October. Crayfish the most comfortable water temperature is about 26 degrees, the water temperature above 35 degrees will stop growing, high temperature season must pay attention to deepen the water level.

1, water color standard, experienced aquaculture farmers like to say that the water color standard is fat, live, tender, cool. Fertilizer means that plankton can be eaten by crayfish. Living refers to the continuous utilization and growth of algae population in the pond, in a good state of biological cycle, phytoplankton balance, tender refers to the exuberant growth of algae and aquatic plants, and the water color is bright and not dark in the sun. Shuang means that there is less suspended matter and organic matter in the water, the water quality is fresh and non-sticky, and there is no oil film on the water surface.

2, water quality standards, the ideal water quality indicators for crayfish culture are as follows, transparency: 30 murmuri 50 cm before the year, 45 murmur70 cm after middle age, PH value: 7.0 murmur8.5, dissolved oxygen: 4 mg per liter, ammonia nitrogen: less than 0.4 mg per liter, hydrogen sulfide: less than 0.03 mg per liter, nitrite: less than 0.1 mg per liter.

After we have the above index parameters, we need to make data records, observe and record more, and do not panic when there are abnormal data. there will be differences in some indicators under different weather conditions, different measurement time and water intake points. Continuous discovery of anomalies should be dealt with. For example, if there is a problem with transparency, it is necessary to change the bottom of fertilizer and water, and the drugs that use live bacteria to cultivate algae can maintain the water quality, and cooperate with other drugs to purify the substrate. These products are available in agricultural stores. High PH value is easy to cause crayfish shelling difficulty, slow growth and other symptoms. Low PH value will cause dyspnea, yellow Gill and other adverse phenomena of crayfish. To adjust the PH, sprinkle raw lime water into the pool every half a month, such as 1 meter deep, 10 kg per mu, to keep the pH of the pool at 7.5 Mel 8.5. Quicklime can increase the concentration of calcium ion in water and promote the molting growth of crayfish. When the dissolved oxygen in Tangkou water is more than 4 mg, the crayfish eat vigorously and grow fast. When the dissolved oxygen is too low, the crayfish less than 2 mg will eat less and go ashore. When the situation continues to be serious, it will stop feeding and float its head ashore. How to solve the problem of dissolved oxygen, first of all, the density of crayfish should be reasonable, do not blindly pursue the quantity outweighs the loss. The second is to choose a good crayfish bait, do not overfeed, causing pollution. Try to put it on a regular and quantitative basis. Third, the reasonable use of aerator to improve the status of dissolved oxygen at the bottom. Patrol the pond on time and often change fresh water. Detection and treatment of ammonia nitrogen, hydrogen sulfide, nitrite and other indexes. You can buy a test box on a treasure, which is very cheap. And then treat it with medicine.

As a matter of fact, the management of water quality is not a simple management, but a problem with antecedents and consequences. The antecedent reason, I have talked about why Xintang water quality problems are few, not easy to get sick. Because the bottom of the pond is new, there are no germs or garbage. You have no problem with farming for two years, and it is easy to make money. After two years of farming, how much sediment there is at the bottom of the pond, including dead shrimp, leftover bait, mossy bacteria, etc., Tangkou is very prone to problems in the third year. Therefore, I personally suggest that intensive farming ponds must dry the ponds to remove silt every year, and try to remove this antecedent. The problem at the bottom of the pond is solved, that is, we usually do a good job in fertilizing water, changing water, patrolling the pond on time, feeding bait on time, observing more and recording more, so that there will be fewer problems, more experience, and more deposits in the bank. Do not patrol the pond when the sun is too big or the weather is not good. Throw a bunch of bait a day and go out to play mahjong immediately. If you cheat crayfish, will the output of crayfish be high? Will your income be high? I'm sure it won't.

Tomorrow update crayfish breeding and disease prevention and treatment.