Aquaculture is the most feared is the lack of oxygen, it will produce excessive harmful bacteria, ammonia nitrogen, nitrite, hydrogen sulfide, resulting in slow growth of fish and shrimp, stealing or even outbreak of disease. Grasping the law of dissolved oxygen can greatly reduce the risk of breeding and increase the success rate of breeding.
Like humans, aquatic animals must survive under aerobic conditions, which can be caused by lack of oxygen, and can be fatal in severe pans. In general, the dissolved oxygen in the culture (cultivation) should be kept at 5-8mg/L, and should be kept at least 4 mg/L. All kinds of fish, crabs and crabs need dissolved oxygen and asphyxiation point mg/L in the following table:
The dissolved oxygen in ponds is mainly produced by the photosynthesis of phytoplankton, mechanical oxygenation, and the dissolved oxygen in the air. The consumption of dissolved oxygen is mainly the respiration of plankton and the decomposition of organic matter in water. In addition, the dissolved oxygen in the pond is also affected by many factors such as light, wind force, atmospheric pressure, plankton, and water quality. Since the dissolved oxygen can not be seen intangible, it is difficult to grasp whether the lack of oxygen, the best way is to use dissolved oxygen measurement and control instrument.
1. The change of dissolved oxygen at the bottom is an important indicator to reflect the health of fish and shrimp, and can provide scientific reference for sediment and water quality.
It is scientific and reliable to use oxygen measuring instruments to understand the changing rules of dissolved oxygen in water. One day should be recorded four times: 1. At 0. 05 in the morning, the lowest level of dissolved oxygen in one day; 2. At 8:30 in the morning, whether or not to start feeding; 3. At 15:30 in the afternoon, the highest level of dissolved oxygen in one day; 4 At 23:00 in the evening, it is the basis for all aerators. Through long-term observation records, changes in sediment quality and water quality can be foreseen and controlled in advance.
1. The change of dissolved oxygen at the bottom should not exceed 7mg/L in one day. This is an important indicator of the health of fish and shrimp. The quality of bottom and water is good, which is suitable for the growth of fish and shrimp.
In the early stage of culture, microorganisms for decomposing organic matter at the bottom of the pool and for cultivating beneficial algae should be periodically introduced; at the middle and later stages of the culture, organic substances decomposing the bottom of the tank and microbial preparations for degrading nitrite and ammonia nitrogen should be regularly put in order to reduce the shortage caused by organic matter. Oxygen, the cultivation of beneficial bacteria and algae; regularly put the powder that is burned from the shells to increase the total alkalinity of the cultured water. The suitable pH for aquaculture is 7.88.6 and the appropriate total alkalinity is 100200, which should not exceed 300 or below 60. However, it should be noted that in the early stage of culture, if harmful algae are produced due to the imbalance of the algal phases, although the dissolved oxygen at the bottom is also normal, fish and shrimp may also develop disease.
2. The dissolved oxygen at the bottom was 89 mg/L within one day, indicating that the culture environment of this pond is in a sub-healthy state.
The water quality is partially fat, algae tends to be rich, and the bottom quality changes in bad direction. The bottom of the pond begins to breed a large number of harmful bacteria, ammonia nitrogen, nitrite and hydrogen sulfide, resulting in slow growth of fish and shrimp. Should be treated in a timely manner: A, reduce the material and mix with microbial preparations to enhance fish and shrimp physique; B, kill a portion of excessively propagated algae (such as morning spilling of chlorine dioxide); C, bottom of the pond: the bottom of oxygen, disinfection (such as The dry oxygenating agent or granular disinfectant should be used. At noon the third day, microbiological preparations should be used to cultivate beneficial bacteria. Microbial preparations should be used regularly. D. Shell powder is added to increase the total alkalinity of the water.
3. The dissolved oxygen at the bottom exceeds 10 mg/L within one day, indicating that the fish and shrimp breeding environment is in an unhealthy state.
The sediment is darkened, the water quality is severely fattened, the algae are too abundant, the shrimp carapace becomes soft and even grow stagnant, and it is easy to cause death or other diseases.
Second, the bottom of the dissolved oxygen science feed:
Dissolved oxygen status is an important factor influencing the food intake of the cultured animals, the digestion and absorption rate of the feed after ingestion, and the growth rate and feed coefficient. According to the relevant research data, the bait coefficient of fish, shrimp, and crab at dissolved oxygen of 3mg/L is double that at 4mg/L, and the growth rate of fish, shrimp and crab at dissolved oxygen of 7mg/L is 4mg/L. The fish, shrimp, and crab are 20%-30% faster, and the bait coefficient is 30%-50% lower. When the amount of dissolved oxygen in the water reaches 4.5 mg/L or more, the appetite enhancement of fish, shrimp, crab is extremely obvious; when it reaches 5 mg/L or more, the bait conversion reaches a maximum value. Therefore, the dissolved oxygen at the bottom of the first feeding should be higher than 5mg/L, and the last feeding should be higher than 5.5mg/L. In this way, the digestion and absorption rate can be increased, the feed cost can be reduced, and the pollution at the bottom of the pond can be reduced and the incidence of the disease can be reduced.
Third, the bottom of dissolved oxygen scientific drugs:
Through the change of dissolved oxygen at the bottom, you can know the effect of drug use and the amount of drugs, such as the use of microbial agents to clear the dirt, oxygenation agent and oxygen.
Fourth, the effective use of dissolved oxygen at the bottom:
The saturation of dissolved oxygen in water is affected by temperature and salinity. At a certain temperature, pure fresh water can only reach the saturation value regardless of how the oxygen is added (see attached table). This is a natural law. When the value of saturated dissolved oxygen is exceeded, the effect of opening the aerator will be insignificant, and electricity will be wasted. In the evening, the algae will stop the photosynthesis. During the day, the supersaturated dissolved oxygen produced by photosynthesis will overflow the water surface. The machine will only accelerate the overflow of supersaturated dissolved oxygen. The more aerators are opened, the faster dissolved oxygen will be reduced.
1. Open the aerator at 13:30 to 15:30 in the sunny day to stir the water body, so that the upper and lower water bodies exchange, increase the dissolved oxygen at the bottom, promote the material circulation in the pool, and improve the water quality and sediment quality of the pond. Except for rainy weather, sewage or other needs;
2, look at the oxygen analyzer to open aerator, when the bottom of the dissolved oxygen is lower than the saturation value and then open the aerator, when the oxygen meter shows below
5.5mg/L should be fully open. Dissolved oxygen consumption is lower than 4.0mg/L, indicating that the oxygenation power is not enough. It is necessary to add oxygenating agents, change the bottom cleaning, and discharge the sewage.
Fifth, the calculation of dissolved oxygen in seawater:
At a water temperature of 30°C, the saturated dissolved oxygen of freshwater is 7.6mg/L; while in a water with a salinity of 10%, the saturated dissolved oxygen is 7.6-100.036=7.24mg/L.
Similarly, the instrument shows dissolved oxygen minus the salinity compensation salinity at the corresponding temperature is the actual dissolved oxygen.
Sixth, "Junxiang" brand dissolved oxygen monitoring and control equipment features and technical advantages:
1. Independent intellectual property products, national invention patents;
2. The lower machine is suspended 25cm from the bottom of the pond. The upper computer (display) is fixed on the bank, and the dissolved oxygen and water temperature at the bottom are measured on-line for a long time.
3, the warranty period of one year; can be used for three consecutive years, free replacement of electrolyte, automatic cleaning of the probe 4 times a day,
4. It is easy to maintain, when the dry pond is filled with tap water filled with or sealed in the probe, it can be calibrated once in half a year or dry pond;
5, accurate measurement, dissolved oxygen error is less than 5%, the temperature error is less than 0.2 degrees; fault, low dissolved oxygen alarm;
6, can set the starting value and shutdown value, automatic control of multiple aerators on and off.
Dissolved oxygen measurement and control instrument is the best tool for you to add oxygen, reduce electricity costs, save labor, increase production, prevent diseases, reduce the cost of feed medicines, and improve the safety of breeding. It can help you to achieve the greatest gain with minimal investment!
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